зеркало из https://github.com/mozilla/MozDef.git
51 строка
2.0 KiB
Python
51 строка
2.0 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) 2017 Mozilla Corporation
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from lib.alerttask import AlertTask
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from mozdef_util.query_models import SearchQuery, TermMatch, PhraseMatch, TermsMatch
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class AlertBruteforceSsh(AlertTask):
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def main(self):
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self.parse_config('bruteforce_ssh.conf', ['skiphosts'])
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search_query = SearchQuery(minutes=2)
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search_query.add_must([
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PhraseMatch('summary', 'failed'),
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TermMatch('details.program', 'sshd'),
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TermsMatch('summary', ['login', 'invalid', 'ldap_count_entries', 'publickey'])
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])
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for ip_address in self.config.skiphosts.split():
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search_query.add_must_not(PhraseMatch('summary', ip_address))
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self.filtersManual(search_query)
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# Search aggregations on field 'sourceipaddress', 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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self.walkAggregations(threshold=10)
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# Set alert properties
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def onAggregation(self, aggreg):
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# aggreg['count']: number of items in the aggregation, ex: number of failed login attempts
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# aggreg['value']: value of the aggregation field, ex: toto@example.com
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# aggreg['events']: list of events in the aggregation
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category = 'bruteforce'
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tags = ['ssh']
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severity = 'NOTICE'
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summary = ('{0} ssh bruteforce attempts by {1}'.format(aggreg['count'], aggreg['value']))
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hosts = self.mostCommon(aggreg['allevents'], '_source.hostname')
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for i in hosts[:5]:
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summary += ' {0} ({1} hits)'.format(i[0], i[1])
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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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