mirror of https://github.com/CIRCL/AIL-framework
add: Decoder module
Terrtia
parent
ad26f016e3
commit
0e67b56906
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#!/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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import time
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import os
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import redis
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import base64
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from hashlib import sha1
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import magic
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import json
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import datetime
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from pubsublogger import publisher
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from Helper import Process
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from packages import Paste
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import re
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import signal
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class TimeoutException(Exception):
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pass
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def timeout_handler(signum, frame):
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raise TimeoutException
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signal.signal(signal.SIGALRM, timeout_handler)
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def hex_decoder(hexStr):
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#hexStr = ''.join( hex_string.split(" ") )
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print( bytes(bytearray([int(hexStr[i:i+2], 16) for i in range(0, len(hexStr), 2)])) )
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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(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(base64_string):
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return base64.b64decode(base64_string)
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def decode_string(content, message, date, encoded_list, decoder_name, encoded_min_size):
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find = False
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print('list')
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print(encoded_min_size)
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print(encoded_list)
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for encoded in encoded_list:
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print(len(encoded))
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if len(encoded) >= encoded_min_size:
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decode = decoder_function[decoder_name](encoded)
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find = True
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save_hash(decoder_name, message, date, decode)
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#remove encoded from paste content
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content = content.replace(encoded, '', 1)
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if(find):
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set_out_paste(decoder_name, message)
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return content
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# # TODO: FIXME check db
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def save_hash(decoder_name, message, date, decoded):
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type = magic.from_buffer(decoded, mime=True)
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print(type)
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hash = sha1(decoded).hexdigest()
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print(hash)
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data = {}
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data['name'] = hash
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data['date'] = datetime.datetime.now().strftime("%d/%m/%y")
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data['origin'] = message
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data['estimated type'] = type
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json_data = json.dumps(data)
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date_paste = '{}/{}/{}'.format(date[0:4], date[4:6], date[6:8])
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date_key = date[0:4] + date[4:6] + date[6:8]
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serv_metadata.zincrby(decoder_name+'_date:'+date_key, hash, 1)
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# first time we see this hash
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if not serv_metadata.hexists('metadata_hash:'+hash, 'estimated_type'):
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serv_metadata.hset('metadata_hash:'+hash, 'first_seen', date_paste)
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serv_metadata.hset('metadata_hash:'+hash, 'last_seen', date_paste)
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else:
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serv_metadata.hset('metadata_hash:'+hash, 'last_seen', date_paste)
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# first time we see this file encoding on this paste
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if serv_metadata.zscore(decoder_name+'_hash:'+hash, message) is None:
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print('first '+decoder_name)
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serv_metadata.hincrby('metadata_hash:'+hash, 'nb_seen_in_all_pastes', 1)
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serv_metadata.sadd(decoder_name+'_paste:'+message, hash) # paste - hash map
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serv_metadata.sadd(decoder_name+'_paste:'+message, hash) # paste - hash map
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serv_metadata.zincrby(decoder_name+'_hash:'+hash, message, 1)# hash - paste map
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# create hash metadata
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serv_metadata.hset('metadata_hash:'+hash, 'estimated_type', type)
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serv_metadata.sadd('hash_all_type', type)
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serv_metadata.sadd('hash_'+ decoder_name +'_all_type', type)
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serv_metadata.zincrby(decoder_name+'_type:'+type, date_key, 1)
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save_hash_on_disk(decoded, type, hash, json_data)
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print('found {} '.format(type))
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# duplicate
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else:
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serv_metadata.zincrby(decoder_name+'_hash:'+hash, message, 1) # number of b64 on this paste
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def save_hash_on_disk(decode, type, hash, json_data):
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local_filename_hash = os.path.join(p.config.get("Directories", "hash"), type, hash[:2], hash)
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filename_hash = os.path.join(os.environ['AIL_HOME'], local_filename_hash)
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filename_json = os.path.join(os.environ['AIL_HOME'],
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p.config.get("Directories", "hash"), type, hash[:2], hash + '.json')
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dirname = os.path.dirname(filename_hash)
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if not os.path.exists(dirname):
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os.makedirs(dirname)
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with open(filename_hash, 'wb') as f:
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f.write(decode)
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# create hash metadata
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serv_metadata.hset('metadata_hash:'+hash, 'saved_path', local_filename_hash)
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serv_metadata.hset('metadata_hash:'+hash, 'size', os.path.getsize(filename_hash))
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with open(filename_json, 'w') as f:
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f.write(json_data)
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def set_out_paste(decoder_name, message):
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publisher.warning(decoder_name+' decoded')
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#Send to duplicate
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p.populate_set_out(message, 'Duplicate')
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#send to Browse_warning_paste
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msg = (decoder_name+';{}'.format(message))
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p.populate_set_out( msg, 'alertHandler')
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msg = 'infoleak:automatic-detection="'+decoder_name+'";{}'.format(message)
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p.populate_set_out(msg, 'Tags')
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if __name__ == '__main__':
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# If you wish to use an other port of channel, do not forget to run a subscriber accordingly (see launch_logs.sh)
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# Port of the redis instance used by pubsublogger
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publisher.port = 6380
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# Script is the default channel used for the modules.
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publisher.channel = 'Script'
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# Section name in bin/packages/modules.cfg
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config_section = 'Decoder'
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# Setup the I/O queues
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p = Process(config_section)
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serv_metadata = redis.StrictRedis(
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host=p.config.get("ARDB_Metadata", "host"),
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port=p.config.getint("ARDB_Metadata", "port"),
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db=p.config.getint("ARDB_Metadata", "db"),
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decode_responses=True)
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# Sent to the logging a description of the module
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publisher.info("Decoder started")
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regex_binary = '[0-1]{40,}'
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#regex_hex = '(0[xX])?[A-Fa-f0-9]{40,}'
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regex_hex = '[A-Fa-f0-9]{40,}'
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regex_base64 = '(?:[A-Za-z0-9+/]{4}){2,}(?:[A-Za-z0-9+/]{2}[AEIMQUYcgkosw048]=|[A-Za-z0-9+/][AQgw]==)'
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'''re.compile(regex_binary)
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re.compile(regex_hex)
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re.compile(regex_base64)'''
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# map decoder function
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decoder_function = {'binary':binary_decoder,'hex':hex_decoder, 'base64':base64_decoder}
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hex_max_execution_time = p.config.getint("Hex", "max_execution_time")
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binary_max_execution_time = p.config.getint("Binary", "max_execution_time")
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base64_max_execution_time = p.config.getint("Base64", "max_execution_time")
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# list all decoder yith regex, the order is use to search content by order
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all_decoder = [ {'name': 'binary', 'regex': regex_binary, 'encoded_min_size': 300, 'max_execution_time': binary_max_execution_time},
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{'name': 'hex', 'regex': regex_hex, 'encoded_min_size': 300, 'max_execution_time': hex_max_execution_time},
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{'name': 'base64', 'regex': regex_base64, 'encoded_min_size': 40, 'max_execution_time': base64_max_execution_time}]
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for decoder in all_decoder:
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serv_metadata.sadd('all_decoder', decoder['name'])
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# Endless loop getting messages from the input queue
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while True:
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# Get one message from the input queue
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message = p.get_from_set()
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if message is None:
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publisher.debug("{} queue is empty, waiting".format(config_section))
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time.sleep(1)
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continue
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filename = message
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paste = Paste.Paste(filename)
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# Do something with the message from the queue
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content = paste.get_p_content()
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date = str(paste._get_p_date())
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for decoder in all_decoder: # add threshold and size limit
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print(decoder['name'])
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# max execution time on regex
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signal.alarm(decoder['max_execution_time'])
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try:
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print(content)
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encoded_list = re.findall(decoder['regex'], content)
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#encoded_list = re.findall(decoder['regex'], content)
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print(decoder['regex'])
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print(encoded_list)
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except TimeoutException:
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encoded_list = []
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p.incr_module_timeout_statistic() # add encoder type
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print ("{0} processing timeout".format(paste.p_path))
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continue
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else:
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signal.alarm(0)
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if(len(encoded_list) > 0):
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content = decode_string(content, message, date, encoded_list, decoder['name'], decoder['encoded_min_size'])
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