PyMISP/pymisp/tools/peobject.py

139 lines
6.1 KiB
Python

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from ..exceptions import InvalidMISPObject
from .abstractgenerator import AbstractMISPObjectGenerator
from io import BytesIO
from hashlib import md5, sha1, sha256, sha512
from datetime import datetime
import logging
logger = logging.getLogger('pymisp')
try:
import lief
HAS_LIEF = True
except ImportError:
HAS_LIEF = False
try:
import pydeep
HAS_PYDEEP = True
except ImportError:
HAS_PYDEEP = False
class PEObject(AbstractMISPObjectGenerator):
def __init__(self, parsed=None, filepath=None, pseudofile=None, standalone=True, **kwargs):
if not HAS_PYDEEP:
logger.warning("Please install pydeep: pip install git+https://github.com/kbandla/pydeep.git")
if not HAS_LIEF:
raise ImportError('Please install lief, documentation here: https://github.com/lief-project/LIEF')
if pseudofile:
if isinstance(pseudofile, BytesIO):
self.__pe = lief.PE.parse(raw=pseudofile.getvalue())
elif isinstance(pseudofile, bytes):
self.__pe = lief.PE.parse(raw=pseudofile)
else:
raise InvalidMISPObject('Pseudo file can be BytesIO or bytes got {}'.format(type(pseudofile)))
elif filepath:
self.__pe = lief.PE.parse(filepath)
elif parsed:
# Got an already parsed blob
if isinstance(parsed, lief.PE.Binary):
self.__pe = parsed
else:
raise InvalidMISPObject('Not a lief.PE.Binary: {}'.format(type(parsed)))
# Python3 way
# super().__init__('pe')
super(PEObject, self).__init__('pe', standalone=standalone, **kwargs)
self.generate_attributes()
def _is_exe(self):
if not self._is_dll() and not self._is_driver():
return self.__pe.header.has_characteristic(lief.PE.HEADER_CHARACTERISTICS.EXECUTABLE_IMAGE)
return False
def _is_dll(self):
return self.__pe.header.has_characteristic(lief.PE.HEADER_CHARACTERISTICS.DLL)
def _is_driver(self):
# List from pefile
system_DLLs = set(('ntoskrnl.exe', 'hal.dll', 'ndis.sys', 'bootvid.dll', 'kdcom.dll'))
if system_DLLs.intersection([imp.lower() for imp in self.__pe.libraries]):
return True
return False
def _get_pe_type(self):
if self._is_dll():
return 'dll'
elif self._is_driver():
return 'driver'
elif self._is_exe():
return 'exe'
else:
return 'unknown'
def generate_attributes(self):
self.add_attribute('type', value=self._get_pe_type())
# General information
self.add_attribute('entrypoint-address', value=self.__pe.entrypoint)
self.add_attribute('compilation-timestamp', value=datetime.utcfromtimestamp(self.__pe.header.time_date_stamps).isoformat())
# self.imphash = self.__pe.get_imphash()
try:
if (self.__pe.has_resources and
self.__pe.resources_manager.has_version and
self.__pe.resources_manager.version.has_string_file_info and
self.__pe.resources_manager.version.string_file_info.langcode_items):
fileinfo = dict(self.__pe.resources_manager.version.string_file_info.langcode_items[0].items.items())
self.add_attribute('original-filename', value=fileinfo.get('OriginalFilename'))
self.add_attribute('internal-filename', value=fileinfo.get('InternalName'))
self.add_attribute('file-description', value=fileinfo.get('FileDescription'))
self.add_attribute('file-version', value=fileinfo.get('FileVersion'))
self.add_attribute('lang-id', value=self.__pe.resources_manager.version.string_file_info.langcode_items[0].key)
self.add_attribute('product-name', value=fileinfo.get('ProductName'))
self.add_attribute('product-version', value=fileinfo.get('ProductVersion'))
self.add_attribute('company-name', value=fileinfo.get('CompanyName'))
self.add_attribute('legal-copyright', value=fileinfo.get('LegalCopyright'))
except lief.read_out_of_bound:
# The file is corrupted
pass
# Sections
self.sections = []
if self.__pe.sections:
pos = 0
for section in self.__pe.sections:
s = PESectionObject(section, self._standalone, default_attributes_paramaters=self._default_attributes_paramaters)
self.add_reference(s.uuid, 'included-in', 'Section {} of PE'.format(pos))
if ((self.__pe.entrypoint >= section.virtual_address) and
(self.__pe.entrypoint < (section.virtual_address + section.virtual_size))):
self.add_attribute('entrypoint-section-at-position', value='{}|{}'.format(section.name, pos))
pos += 1
self.sections.append(s)
self.add_attribute('number-sections', value=len(self.sections))
# TODO: TLSSection / DIRECTORY_ENTRY_TLS
class PESectionObject(AbstractMISPObjectGenerator):
def __init__(self, section, standalone=True, **kwargs):
# Python3 way
# super().__init__('pe-section')
super(PESectionObject, self).__init__('pe-section', standalone=standalone, **kwargs)
self.__section = section
self.__data = bytes(self.__section.content)
self.generate_attributes()
def generate_attributes(self):
self.add_attribute('name', value=self.__section.name)
size = self.add_attribute('size-in-bytes', value=self.__section.size)
if int(size.value) > 0:
self.add_attribute('entropy', value=self.__section.entropy)
self.add_attribute('md5', value=md5(self.__data).hexdigest())
self.add_attribute('sha1', value=sha1(self.__data).hexdigest())
self.add_attribute('sha256', value=sha256(self.__data).hexdigest())
self.add_attribute('sha512', value=sha512(self.__data).hexdigest())
if HAS_PYDEEP:
self.add_attribute('ssdeep', value=pydeep.hash_buf(self.__data).decode())