Source code for plaso.parsers.winprefetch

# -*- coding: utf-8 -*-
"""Parser for Windows Prefetch files."""

import pyscca

from dfdatetime import filetime as dfdatetime_filetime
from dfdatetime import semantic_time as dfdatetime_semantic_time

from plaso.containers import events
from plaso.containers import time_events
from plaso.containers import windows_events
from plaso.lib import definitions
from plaso.lib import specification
from plaso.parsers import interface
from plaso.parsers import manager


[docs]class WinPrefetchExecutionEventData(events.EventData): """Windows Prefetch event data. Attributes: executable (str): executable filename. format_version (int): format version. mapped_files (list[str]): mapped filenames. number_of_volumes (int): number of volumes. path_hints (list[str]): possible full paths to the executable. prefetch_hash (int): prefetch hash. run_count (int): run count. volume_device_paths (list[str]): volume device paths. volume_serial_numbers (list[int]): volume serial numbers. """ DATA_TYPE = 'windows:prefetch:execution' def __init__(self): """Initializes event data.""" super(WinPrefetchExecutionEventData, self).__init__( data_type=self.DATA_TYPE) self.executable = None self.mapped_files = None self.number_of_volumes = None self.path_hints = None self.prefetch_hash = None self.run_count = None self.version = None self.volume_device_paths = None self.volume_serial_numbers = None
[docs]class WinPrefetchParser(interface.FileObjectParser): """A parser for Windows Prefetch files.""" _INITIAL_FILE_OFFSET = None NAME = 'prefetch' DATA_FORMAT = 'Windows Prefetch File (PF)'
[docs] @classmethod def GetFormatSpecification(cls): """Retrieves the format specification. Returns: FormatSpecification: format specification. """ format_specification = specification.FormatSpecification(cls.NAME) format_specification.AddNewSignature(b'SCCA', offset=4) format_specification.AddNewSignature(b'MAM\x04', offset=0) return format_specification
def _ParseSCCAFile(self, parser_mediator, scca_file): """Parses a Windows Prefetch (SCCA) file. Args: parser_mediator (ParserMediator): mediates interactions between parsers and other components, such as storage and dfvfs. scca_file (pyscca.file): Windows Prefetch (SCCA) file Raises: IOError: if the Windows Prefetch (SCCA) file cannot be parsed. """ format_version = scca_file.format_version executable_filename = scca_file.executable_filename prefetch_hash = scca_file.prefetch_hash run_count = scca_file.run_count number_of_volumes = scca_file.number_of_volumes volume_serial_numbers = [] volume_device_paths = [] path_hints = [] for volume_information in iter(scca_file.volumes): volume_serial_number = volume_information.serial_number volume_device_path = volume_information.device_path volume_serial_numbers.append(volume_serial_number) volume_device_paths.append(volume_device_path) timestamp = volume_information.get_creation_time_as_integer() if timestamp: event_data = windows_events.WindowsVolumeEventData() event_data.device_path = volume_device_path event_data.origin = parser_mediator.GetFilename() event_data.serial_number = volume_serial_number date_time = dfdatetime_filetime.Filetime(timestamp=timestamp) event = time_events.DateTimeValuesEvent( date_time, definitions.TIME_DESCRIPTION_CREATION) parser_mediator.ProduceEventWithEventData(event, event_data) for filename in iter(scca_file.filenames): if not filename: continue if (filename.startswith(volume_device_path) and filename.endswith(executable_filename)): _, _, path = filename.partition(volume_device_path) path_hints.append(path) mapped_files = [] for entry_index, file_metrics in enumerate(scca_file.file_metrics_entries): mapped_file_string = file_metrics.filename if not mapped_file_string: parser_mediator.ProduceExtractionWarning( 'missing filename for file metrics entry: {0:d}'.format( entry_index)) continue file_reference = file_metrics.file_reference if file_reference: mapped_file_string = ( '{0:s} [{1:d}-{2:d}]').format( mapped_file_string, file_reference & 0xffffffffffff, file_reference >> 48) mapped_files.append(mapped_file_string) event_data = WinPrefetchExecutionEventData() event_data.executable = executable_filename event_data.mapped_files = mapped_files event_data.number_of_volumes = number_of_volumes event_data.path_hints = path_hints event_data.prefetch_hash = prefetch_hash event_data.run_count = run_count event_data.version = format_version event_data.volume_device_paths = volume_device_paths event_data.volume_serial_numbers = volume_serial_numbers timestamp = scca_file.get_last_run_time_as_integer(0) if not timestamp: parser_mediator.ProduceExtractionWarning('missing last run time') date_time = dfdatetime_semantic_time.NotSet() else: date_time = dfdatetime_filetime.Filetime(timestamp=timestamp) event = time_events.DateTimeValuesEvent( date_time, definitions.TIME_DESCRIPTION_LAST_RUN) parser_mediator.ProduceEventWithEventData(event, event_data) # Check for the 7 older last run time values available since # format version 26. if format_version >= 26: for last_run_time_index in range(1, 8): timestamp = scca_file.get_last_run_time_as_integer(last_run_time_index) if not timestamp: continue date_time = dfdatetime_filetime.Filetime(timestamp=timestamp) date_time_description = 'Previous {0:s}'.format( definitions.TIME_DESCRIPTION_LAST_RUN) event = time_events.DateTimeValuesEvent( date_time, date_time_description) parser_mediator.ProduceEventWithEventData(event, event_data)
[docs] def ParseFileObject(self, parser_mediator, file_object): """Parses a Windows Prefetch file-like object. Args: parser_mediator (ParserMediator): mediates interactions between parsers and other components, such as storage and dfvfs. file_object (dfvfs.FileIO): file-like object. """ scca_file = pyscca.file() try: scca_file.open_file_object(file_object) except IOError as exception: parser_mediator.ProduceExtractionWarning( 'unable to open file with error: {0!s}'.format(exception)) return try: self._ParseSCCAFile(parser_mediator, scca_file) except IOError as exception: parser_mediator.ProduceExtractionWarning( 'unable to parse file with error: {0!s}'.format(exception)) finally: scca_file.close()
manager.ParsersManager.RegisterParser(WinPrefetchParser)