Source code for pymisp.tools.elfobject

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from .abstractgenerator import AbstractMISPObjectGenerator
from ..exceptions import InvalidMISPObject
from io import BytesIO
from hashlib import md5, sha1, sha256, sha512
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


[docs]class ELFObject(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.__elf = lief.ELF.parse(raw=pseudofile.getvalue()) elif isinstance(pseudofile, bytes): self.__elf = lief.ELF.parse(raw=pseudofile) else: raise InvalidMISPObject('Pseudo file can be BytesIO or bytes got {}'.format(type(pseudofile))) elif filepath: self.__elf = lief.ELF.parse(filepath) elif parsed: # Got an already parsed blob if isinstance(parsed, lief.ELF.Binary): self.__elf = parsed else: raise InvalidMISPObject('Not a lief.ELF.Binary: {}'.format(type(parsed))) super(ELFObject, self).__init__('elf', standalone=standalone, **kwargs) self.generate_attributes()
[docs] def generate_attributes(self): # General information self.add_attribute('type', value=str(self.__elf.header.file_type).split('.')[1]) self.add_attribute('entrypoint-address', value=self.__elf.entrypoint) self.add_attribute('arch', value=str(self.__elf.header.machine_type).split('.')[1]) self.add_attribute('os_abi', value=str(self.__elf.header.identity_os_abi).split('.')[1]) # Sections self.sections = [] if self.__elf.sections: pos = 0 for section in self.__elf.sections: s = ELFSectionObject(section, self._standalone, default_attributes_parameters=self._default_attributes_parameters) self.add_reference(s.uuid, 'included-in', 'Section {} of ELF'.format(pos)) pos += 1 self.sections.append(s) self.add_attribute('number-sections', value=len(self.sections))
[docs]class ELFSectionObject(AbstractMISPObjectGenerator): def __init__(self, section, standalone=True, **kwargs): # Python3 way # super().__init__('pe-section') super(ELFSectionObject, self).__init__('elf-section', standalone=standalone, **kwargs) self.__section = section self.__data = bytes(self.__section.content) self.generate_attributes()
[docs] def generate_attributes(self): self.add_attribute('name', value=self.__section.name) self.add_attribute('type', value=str(self.__section.type).split('.')[1]) for flag in self.__section.flags_list: self.add_attribute('flag', value=str(flag).split('.')[1]) 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())