mirror of https://github.com/CIRCL/AIL-framework
148 lines
5.5 KiB
Python
Executable File
148 lines
5.5 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*-coding:UTF-8 -*
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"""
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Decoder module
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Dectect Binary and decode it
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"""
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##################################
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# Import External packages
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##################################
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import os
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import base64
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from hashlib import sha1
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import re
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import sys
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sys.path.append(os.environ['AIL_BIN'])
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##################################
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# Import Project packages
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##################################
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from modules.abstract_module import AbstractModule
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from lib.ConfigLoader import ConfigLoader
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from lib.objects.Items import Item
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from lib.objects.Decodeds import Decoded
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from trackers.Tracker_Term import Tracker_Term
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from trackers.Tracker_Regex import Tracker_Regex
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from trackers.Tracker_Yara import Tracker_Yara
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config_loader = ConfigLoader()
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hex_max_execution_time = config_loader.get_config_int("Decoder", "max_execution_time_hexadecimal")
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binary_max_execution_time = config_loader.get_config_int("Decoder", "max_execution_time_binary")
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base64_max_execution_time = config_loader.get_config_int("Decoder", "max_execution_time_base64")
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config_loader = None
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class Decoder(AbstractModule):
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"""
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Decoder module for AIL framework
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"""
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def hex_decoder(self, hexStr):
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# hexStr = ''.join( hex_string.split(" ") )
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return bytes(bytearray([int(hexStr[i:i+2], 16) for i in range(0, len(hexStr), 2)]))
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def binary_decoder(self, binary_string):
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return bytes(bytearray([int(binary_string[i:i+8], 2) for i in range(0, len(binary_string), 8)]))
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def base64_decoder(self, base64_string):
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return base64.b64decode(base64_string)
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def __init__(self):
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super(Decoder, self).__init__()
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regex_binary = r'[0-1]{40,}'
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# regex_hex = r'(0[xX])?[A-Fa-f0-9]{40,}'
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regex_hex = r'[A-Fa-f0-9]{40,}'
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regex_base64 = r'(?:[A-Za-z0-9+/]{4}){2,}(?:[A-Za-z0-9+/]{2}[AEIMQUYcgkosw048]=|[A-Za-z0-9+/][AQgw]==)'
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cmp_regex_binary = re.compile(regex_binary)
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cmp_regex_hex = re.compile(regex_hex)
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cmp_regex_base64 = re.compile(regex_base64)
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# map decoder function
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self.decoder_function = {'binary': self.binary_decoder,
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'hexadecimal': self.hex_decoder,
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'base64': self.base64_decoder}
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# list all decoder with regex,
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decoder_binary = {'name': 'binary', 'regex': cmp_regex_binary,
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'encoded_min_size': 300, 'max_execution_time': binary_max_execution_time}
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decoder_hexadecimal = {'name': 'hexadecimal', 'regex': cmp_regex_hex,
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'encoded_min_size': 300, 'max_execution_time': hex_max_execution_time}
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decoder_base64 = {'name': 'base64', 'regex': cmp_regex_base64,
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'encoded_min_size': 40, 'max_execution_time': base64_max_execution_time}
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self.decoder_order = [decoder_base64, decoder_binary, decoder_hexadecimal, decoder_base64]
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# Waiting time in seconds between to message processed
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self.pending_seconds = 1
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self.tracker_term = Tracker_Term(queue=False)
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self.tracker_regex = Tracker_Regex(queue=False)
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self.tracker_yara = Tracker_Yara(queue=False)
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# Send module state to logs
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self.logger.info(f'Module {self.module_name} initialized')
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def compute(self, message):
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item = self.get_obj()
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content = item.get_content()
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date = item.get_date()
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new_decodeds = []
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for decoder in self.decoder_order:
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find = False
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dname = decoder['name']
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encodeds = self.regex_findall(decoder['regex'], item.id, content)
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# PERF remove encoded from item content
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for encoded in encodeds:
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content = content.replace(encoded, '', 1)
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encodeds = set(encodeds)
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for encoded in encodeds:
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if len(encoded) >= decoder['encoded_min_size']:
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find = True
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decoded_file = self.decoder_function[dname](encoded)
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sha1_string = sha1(decoded_file).hexdigest()
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decoded = Decoded(sha1_string)
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if not decoded.exists():
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mimetype = decoded.guess_mimetype(decoded_file)
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if not mimetype:
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print(sha1_string, item.id)
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raise Exception(f'Invalid mimetype: {decoded.id} {item.id}')
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decoded.save_file(decoded_file, mimetype)
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new_decodeds.append(decoded.id)
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else:
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mimetype = decoded.get_mimetype()
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decoded.add(dname, date, item.id, mimetype=mimetype)
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# new_decodeds.append(decoded.id)
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self.logger.info(f'{item.id} : {dname} - {decoded.id} - {mimetype}')
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if find:
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self.logger.info(f'{item.id} - {dname}')
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# Send to Tags
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tag = f'infoleak:automatic-detection="{dname}"'
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self.add_message_to_queue(message=tag, queue='Tags')
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####################
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# TRACKERS DECODED
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for decoded_id in new_decodeds:
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try:
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self.tracker_term.compute(decoded_id, obj_type='decoded')
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self.tracker_regex.compute(decoded_id, obj_type='decoded')
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except UnicodeDecodeError:
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pass
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self.tracker_yara.compute(decoded_id, obj_type='decoded')
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if __name__ == '__main__':
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module = Decoder()
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module.run()
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