зеркало из https://github.com/mozilla/MozDef.git
53 строки
2.0 KiB
Python
53 строки
2.0 KiB
Python
#!/usr/bin/env python
|
|
|
|
# This Source Code Form is subject to the terms of the Mozilla Public
|
|
# License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
|
|
# Copyright (c) 2014 Mozilla Corporation
|
|
|
|
|
|
from lib.alerttask import AlertTask
|
|
from mozdef_util.query_models import SearchQuery, TermMatch
|
|
|
|
|
|
class AlertProxyExfilDomains(AlertTask):
|
|
def main(self):
|
|
self.parse_config("proxy_exfil_domains.conf", ["exfil_domains"])
|
|
|
|
search_query = SearchQuery(minutes=20)
|
|
|
|
search_query.add_must([TermMatch("category", "proxy")])
|
|
|
|
for domain in self.config.exfil_domains.split(","):
|
|
search_query.add_should([TermMatch("details.host", domain)])
|
|
|
|
self.filtersManual(search_query)
|
|
|
|
# Search aggregations on field 'hostname', keep X samples of
|
|
# events at most
|
|
self.searchEventsAggregated("details.sourceipaddress", samplesLimit=10)
|
|
# alert when >= X matching events in an aggregation
|
|
# I think it makes sense to alert every time here
|
|
self.walkAggregations(threshold=1)
|
|
|
|
# Set alert properties
|
|
def onAggregation(self, aggreg):
|
|
# aggreg['count']: number of items in the aggregation, ex: number of failed login attempts
|
|
# aggreg['value']: value of the aggregation field, ex: toto@example.com
|
|
# aggreg['events']: list of events in the aggregation
|
|
category = "squid"
|
|
tags = ["squid", "proxy"]
|
|
severity = "WARNING"
|
|
|
|
exfil_domains = set()
|
|
for event in aggreg["allevents"]:
|
|
domain = event["_source"]["details"]["host"]
|
|
exfil_domains.add(domain)
|
|
|
|
summary = "Suspicious Proxy event(s) detected from {0} to the following exfil domain(s): {1}".format(
|
|
aggreg["value"], ",".join(sorted(exfil_domains))
|
|
)
|
|
|
|
# Create the alert object based on these properties
|
|
return self.createAlertDict(summary, category, tags, aggreg["events"], severity)
|