PyMISP/pymisp/tools/elfobject.py

102 lines
4.4 KiB
Python

#!/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
from typing import Union, Optional
from pathlib import Path
from . import FileObject
import lief
try:
import pydeep # type: ignore
HAS_PYDEEP = True
except ImportError:
HAS_PYDEEP = False
logger = logging.getLogger('pymisp')
def make_elf_objects(lief_parsed: lief.ELF.Binary, misp_file: FileObject, standalone: bool = True, default_attributes_parameters: dict = {}):
elf_object = ELFObject(parsed=lief_parsed, standalone=standalone, default_attributes_parameters=default_attributes_parameters)
misp_file.add_reference(elf_object.uuid, 'includes', 'ELF indicators')
elf_sections = []
for s in elf_object.sections:
elf_sections.append(s)
return misp_file, elf_object, elf_sections
class ELFObject(AbstractMISPObjectGenerator):
def __init__(self, parsed: Optional[lief.ELF.Binary] = None, filepath: Optional[Union[Path, str]] = None, pseudofile: Optional[BytesIO] = None, **kwargs):
"""Creates an ELF object, with lief"""
super().__init__('elf', **kwargs)
if not HAS_PYDEEP:
logger.warning("pydeep is missing, please install pymisp this way: pip install pymisp[fileobjects]")
if pseudofile:
if isinstance(pseudofile, BytesIO):
self.__elf = lief.ELF.parse(io=pseudofile)
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)))
self.generate_attributes()
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:
if not section.name:
continue
s = ELFSectionObject(section, standalone=self._standalone, default_attributes_parameters=self._default_attributes_parameters)
self.add_reference(s.uuid, 'includes', 'Section {} of ELF'.format(pos))
pos += 1
self.sections.append(s)
self.add_attribute('number-sections', value=len(self.sections))
class ELFSectionObject(AbstractMISPObjectGenerator):
def __init__(self, section: lief.ELF.Section, **kwargs):
"""Creates an ELF Section object. Object generated by ELFObject."""
# Python3 way
# super().__init__('pe-section')
super(ELFSectionObject, self).__init__('elf-section', **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)
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())