PyMISP/pymisp/tools/elfobject.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
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from .abstractgenerator import AbstractMISPObjectGenerator
from ..exceptions import InvalidMISPObject
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from io import BytesIO
from hashlib import md5, sha1, sha256, sha512
import logging
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from typing import Union
from pathlib import Path
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from . import FileObject
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import lief # type: ignore
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try:
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import pydeep # type: ignore
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HAS_PYDEEP = True
except ImportError:
HAS_PYDEEP = False
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logger = logging.getLogger('pymisp')
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def make_elf_objects(lief_parsed: lief.Binary, misp_file: FileObject, standalone: bool = True, default_attributes_parameters: dict = {}):
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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
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class ELFObject(AbstractMISPObjectGenerator):
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def __init__(self, parsed: lief.ELF.Binary = None, filepath: Union[Path, str] = None, pseudofile: Union[BytesIO, bytes] = None, **kwargs):
super(ELFObject, self).__init__('elf', **kwargs)
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if not HAS_PYDEEP:
logger.warning("Please install pydeep: pip install git+https://github.com/kbandla/pydeep.git")
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if pseudofile:
if isinstance(pseudofile, BytesIO):
self.__elf = lief.ELF.parse(raw=pseudofile.getvalue())
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elif isinstance(pseudofile, bytes):
self.__elf = lief.ELF.parse(raw=pseudofile)
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else:
raise InvalidMISPObject('Pseudo file can be BytesIO or bytes got {}'.format(type(pseudofile)))
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elif filepath:
self.__elf = lief.ELF.parse(filepath)
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elif parsed:
# Got an already parsed blob
if isinstance(parsed, lief.ELF.Binary):
self.__elf = parsed
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else:
raise InvalidMISPObject('Not a lief.ELF.Binary: {}'.format(type(parsed)))
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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])
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# Sections
self.sections = []
if self.__elf.sections:
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pos = 0
for section in self.__elf.sections:
s = ELFSectionObject(section, standalone=self._standalone, default_attributes_parameters=self._default_attributes_parameters)
self.add_reference(s.uuid, 'includes', 'Section {} of ELF'.format(pos))
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pos += 1
self.sections.append(s)
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self.add_attribute('number-sections', value=len(self.sections))
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class ELFSectionObject(AbstractMISPObjectGenerator):
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def __init__(self, section: lief.ELF.Section, **kwargs):
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# Python3 way
# super().__init__('pe-section')
super(ELFSectionObject, self).__init__('elf-section', **kwargs)
self.__section = section
self.__data = bytes(self.__section.content)
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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:
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self.add_attribute('flag', value=str(flag).split('.')[1])
size = self.add_attribute('size-in-bytes', value=self.__section.size)
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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())
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if HAS_PYDEEP:
self.add_attribute('ssdeep', value=pydeep.hash_buf(self.__data).decode())