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