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
from pathlib import Path
from . import FileObject
import lief # type: ignore
try:
import pydeep # type: ignore
HAS_PYDEEP = True
except ImportError:
HAS_PYDEEP = False
logger = logging.getLogger('pymisp')
def make_elf_objects(lief_parsed: lief.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: lief.ELF.Binary = None, filepath: Union[Path, str] = None, pseudofile: Union[BytesIO, bytes] = None, **kwargs):
"""Creates an ELF object, with lief"""
super().__init__('elf', **kwargs)
if not HAS_PYDEEP:
logger.warning("Please install pydeep: pip install git+https://github.com/kbandla/pydeep.git")
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)))
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())