Source code for workbench.workers.pe_peid
''' PE peid worker, uses the peid_userdb.txt database of signatures '''
import os
import peutils
import pefile
import pkg_resources
import pprint
# We want to load this once per module load
[docs]def get_peid_db():
''' Grab the peid_userdb.txt file from local disk '''
# Try to find the yara rules directory relative to the worker
my_dir = os.path.dirname(os.path.realpath(__file__))
db_path = os.path.join(my_dir, 'peid_userdb.txt')
if not os.path.exists(db_path):
raise RuntimeError('peid could not find peid_userdb.txt under: %s' % db_path)
# Okay load up signature
signatures = peutils.SignatureDatabase(data = open(db_path, 'rb').read())
return signatures
PEID_SIGS = get_peid_db()
[docs]class PEIDWorker(object):
''' This worker looks up pe_id signatures for a PE file. '''
dependencies = ['sample']
def __init__(self):
self.peid_sigs = PEID_SIGS
[docs] def execute(self, input_data):
''' Execute the PEIDWorker '''
raw_bytes = input_data['sample']['raw_bytes']
# Have the PE File module process the file
try:
pefile_handle = pefile.PE(data=raw_bytes, fast_load=False)
except (AttributeError, pefile.PEFormatError), error:
return {'error': str(error), 'match_list': []}
# Now get information from PEID module
peid_match = self.peid_features(pefile_handle)
return {'match_list': peid_match}
[docs] def peid_features(self, pefile_handle):
''' Get features from PEid signature database'''
peid_match = self.peid_sigs.match(pefile_handle)
return peid_match if peid_match else []
# Unit test: Create the class, the proper input and run the execute() method for a test
[docs]def test():
''' pe_peid.py: Unit test'''
# This worker test requires a local server running
import zerorpc
workbench = zerorpc.Client(timeout=300, heartbeat=60)
workbench.connect("tcp://127.0.0.1:4242")
# Generate input for the worker
import os
data_path = os.path.join(os.path.dirname(os.path.realpath(__file__)),
'../data/pe/bad/86714940f491bc38c2e842e80c7f778e')
md5 = workbench.store_sample(open(data_path, 'rb').read(), 'bad_pe', 'exe')
input_data = workbench.get_sample(md5)
# Execute the worker (unit test)
worker = PEIDWorker()
output = worker.execute(input_data)
print '\n<<< Unit Test >>>'
pprint.pprint(output)
# Execute the worker (server test)
output = workbench.work_request('pe_peid', md5)
print '\n<<< Server Test >>>'
pprint.pprint(output)
if __name__ == "__main__":
test()