зеркало из https://github.com/mozilla/MozDef.git
59 строки
2.1 KiB
Python
59 строки
2.1 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 http://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 QueryStringMatch, SearchQuery, TermMatch
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class AlertProxyDropNonStandardPort(AlertTask):
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def main(self):
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self.parse_config(
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'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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TermMatch('category', 'squid'),
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TermMatch('tags', 'squid'),
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TermMatch('details.proxyaction', 'TCP_DENIED/-'),
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TermMatch('details.tcpaction', 'CONNECT')
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])
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# Only notify on certain ports from config
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port_regex = "/.*:({0})/".format(
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self.config.excludedports.replace(',', '|'))
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search_query.add_must_not([
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QueryStringMatch('details.destination: {}'.format(port_regex))
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])
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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'],
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",".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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