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