mirror of https://github.com/MISP/PyMISP
102 lines
4.4 KiB
Python
102 lines
4.4 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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from .abstractgenerator import AbstractMISPObjectGenerator
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from ..exceptions import InvalidMISPObject
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from io import BytesIO
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from hashlib import md5, sha1, sha256, sha512
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import logging
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from typing import Union, Optional
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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
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except ImportError:
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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)
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misp_file.add_reference(elf_object.uuid, 'includes', 'ELF indicators')
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elf_sections = []
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for s in elf_object.sections:
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elf_sections.append(s)
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return misp_file, elf_object, elf_sections
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class ELFObject(AbstractMISPObjectGenerator):
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def __init__(self, parsed: Optional[lief.ELF.Binary] = None, filepath: Optional[Union[Path, str]] = None, pseudofile: Optional[Union[BytesIO, bytes]] = None, **kwargs):
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"""Creates an ELF object, with lief"""
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super().__init__('elf', **kwargs)
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if not HAS_PYDEEP:
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logger.warning("pydeep is missing, please install pymisp this way: pip install pymisp[fileobjects]")
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if pseudofile:
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if isinstance(pseudofile, BytesIO):
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self.__elf = lief.ELF.parse(raw=pseudofile.getvalue())
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elif isinstance(pseudofile, bytes):
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self.__elf = lief.ELF.parse(raw=pseudofile)
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else:
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raise InvalidMISPObject('Pseudo file can be BytesIO or bytes got {}'.format(type(pseudofile)))
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elif filepath:
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self.__elf = lief.ELF.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.ELF.Binary):
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self.__elf = parsed
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else:
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raise InvalidMISPObject('Not a lief.ELF.Binary: {}'.format(type(parsed)))
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self.generate_attributes()
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def generate_attributes(self):
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# General information
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self.add_attribute('type', value=str(self.__elf.header.file_type).split('.')[1])
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self.add_attribute('entrypoint-address', value=self.__elf.entrypoint)
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self.add_attribute('arch', value=str(self.__elf.header.machine_type).split('.')[1])
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self.add_attribute('os_abi', value=str(self.__elf.header.identity_os_abi).split('.')[1])
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# Sections
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self.sections = []
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if self.__elf.sections:
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pos = 0
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for section in self.__elf.sections:
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if not section.name:
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continue
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s = ELFSectionObject(section, standalone=self._standalone, default_attributes_parameters=self._default_attributes_parameters)
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self.add_reference(s.uuid, 'includes', 'Section {} of ELF'.format(pos))
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pos += 1
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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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"""Creates an ELF Section object. Object generated by ELFObject."""
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# Python3 way
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# super().__init__('pe-section')
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super(ELFSectionObject, self).__init__('elf-section', **kwargs)
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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.add_attribute('name', value=self.__section.name)
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self.add_attribute('type', value=str(self.__section.type).split('.')[1])
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for flag in self.__section.flags_list:
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self.add_attribute('flag', value=str(flag).split('.')[1])
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size = self.add_attribute('size-in-bytes', value=self.__section.size)
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if int(size.value) > 0:
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self.add_attribute('entropy', value=self.__section.entropy)
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self.add_attribute('md5', value=md5(self.__data).hexdigest())
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self.add_attribute('sha1', value=sha1(self.__data).hexdigest())
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self.add_attribute('sha256', value=sha256(self.__data).hexdigest())
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self.add_attribute('sha512', value=sha512(self.__data).hexdigest())
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if HAS_PYDEEP:
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self.add_attribute('ssdeep', value=pydeep.hash_buf(self.__data).decode())
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