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Rework of the feed generator

- use objects, attribute tags and object references correctly
- generate quickhashlist for fast lookups / future MISP caching mechanism
- saner structure (herp-a-derp)
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iglocska committed Nov 4, 2017
1 parent 0e123af commit 195cd6d7fc305ac6628ed8f2ff762b3f69a9b6ca
Showing with 114 additions and 57 deletions.
  1. +114 −57 examples/feed-generator/generate.py
@@ -4,28 +4,79 @@
import sys
import json
import os
import hashlib
from pymisp import PyMISP
from settings import url, key, ssl, outputdir, filters, valid_attribute_distribution_levels
objectsToSave = {'Orgc': {'fields': ['name', 'uuid'],
'multiple': False,
},
'Tag': {'fields': ['name', 'colour', 'exportable'],
'multiple': True,
},
'Attribute': {'fields': ['uuid', 'value', 'category', 'type',
'comment', 'data', 'timestamp', 'to_ids'],
'multiple': True,
},
}
fieldsToSave = ['uuid', 'info', 'threat_level_id', 'analysis',
'timestamp', 'publish_timestamp', 'published',
'date']
objectsFields = {
'Attribute': {
'uuid',
'value',
'category',
'type',
'comment',
'data',
'timestamp',
'to_ids'
},
'Event': {
'uuid',
'info',
'threat_level_id',
'analysis',
'timestamp',
'publish_timestamp',
'published',
'date'
},
'Object': {
'name',
'meta-category',
'description',
'template_uuid',
'template_version',
'uuid',
'timestamp',
'distribution',
'sharing_group_id',
'comment'
},
'ObjectReference': {
'uuid',
'timestamp',
'relationship_type',
'comment',
'object_uuid',
'referenced_uuid'
},
'Orgc': {
'name',
'uuid'
},
'Tag': {
'name',
'colour',
'exportable'
}
}
objectsToSave = {
'Orgc': {},
'Tag': {},
'Attribute': {
'Tag': {}
},
'Object': {
'Attribute': {
'Tag': {}
},
'ObjectReference': {}
}
}
valid_attribute_distributions = []
attributeHashes = []
def init():
# If we have an old settings.py file then this variable won't exist
@@ -36,61 +87,65 @@ def init():
valid_attribute_distributions = ['0', '1', '2', '3', '4', '5']
return PyMISP(url, key, ssl)
def recursiveExtract(container, containerType, leaf, eventUuid):
temp = {}
if containerType in ['Attribute', 'Object']:
if (__blockByDistribution(container)):
return False
for field in objectsFields[containerType]:
if field in container:
temp[field] = container[field]
if (containerType == 'Attribute'):
global attributeHashes
if ('|' in container['type'] or container['type'] == 'malware-sample'):
split = container['value'].split('|')
attributeHashes.append([hashlib.md5(split[0].encode("utf-8")).hexdigest(), eventUuid])
attributeHashes.append([hashlib.md5(split[1].encode("utf-8")).hexdigest(), eventUuid])
else:
attributeHashes.append([hashlib.md5(container['value'].encode("utf-8")).hexdigest(), eventUuid])
children = leaf.keys()
for childType in children:
childContainer = container.get(childType)
if (childContainer):
if (type(childContainer) is dict):
temp[childType] = recursiveExtract(childContainer, childType, leaf[childType], eventUuid)
else:
temp[childType] = []
for element in childContainer:
processed = recursiveExtract(element, childType, leaf[childType], eventUuid)
if (processed):
temp[childType].append(processed)
return temp
def saveEvent(misp, uuid):
result = {}
event = misp.get_event(uuid)
if not event.get('Event'):
print('Error while fetching event: {}'.format(event['message']))
sys.exit('Could not create file for event ' + uuid + '.')
event = __cleanUpEvent(event)
event['Event'] = recursiveExtract(event['Event'], 'Event', objectsToSave, event['Event']['uuid'])
event = json.dumps(event)
eventFile = open(os.path.join(outputdir, uuid + '.json'), 'w')
eventFile.write(event)
eventFile.close()
def __cleanUpEvent(event):
temp = event
event = {'Event': {}}
__cleanupEventFields(event, temp)
__cleanupEventObjects(event, temp)
return event
def __cleanupEventFields(event, temp):
for field in fieldsToSave:
if field in temp['Event'].keys():
event['Event'][field] = temp['Event'][field]
return event
def __blockAttributeByDistribution(attribute):
if attribute['distribution'] not in valid_attribute_distributions:
def __blockByDistribution(element):
if element['distribution'] not in valid_attribute_distributions:
return True
return False
def saveHashes():
if not attributeHashes:
return False
try:
hashFile = open(os.path.join(outputdir, 'hashes.csv'), 'w')
for element in attributeHashes:
hashFile.write('{},{}\n'.format(element[0], element[1]))
hashFile.close()
except Exception as e:
print(e)
sys.exit('Could not create the quick hash lookup file.')
def __cleanupEventObjects(event, temp):
for objectType in objectsToSave.keys():
if objectsToSave[objectType]['multiple'] is True:
if objectType in temp['Event']:
for objectInstance in temp['Event'][objectType]:
if objectType is 'Attribute':
if __blockAttributeByDistribution(objectInstance):
continue
tempObject = {}
for field in objectsToSave[objectType]['fields']:
if field in objectInstance.keys():
tempObject[field] = objectInstance[field]
if objectType not in event['Event']:
event['Event'][objectType] = []
event['Event'][objectType].append(tempObject)
else:
tempObject = {}
for field in objectsToSave[objectType]['fields']:
tempObject[field] = temp['Event'][objectType][field]
event['Event'][objectType] = tempObject
return event
def saveManifest(manifest):
@@ -138,4 +193,6 @@ def __addEventToManifest(event):
print("Event " + str(counter) + "/" + str(total) + " exported.")
counter += 1
saveManifest(manifest)
print('Manifest saved. Feed creation completed.')
print('Manifest saved.')
saveHashes()
print('Hashes saved. Feed creation completed.')

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