зеркало из https://github.com/mozilla/MozDef.git
41 строка
1.7 KiB
Python
41 строка
1.7 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 http://mozilla.org/MPL/2.0/.
|
|
# Copyright (c) 2014 Mozilla Corporation
|
|
#
|
|
# Contributors:
|
|
# Anthony Verez averez@mozilla.com
|
|
|
|
from lib.alerttask import AlertTask
|
|
|
|
class AlertBruteforceSsh(AlertTask):
|
|
def main(self):
|
|
# look for events in last 15 mins
|
|
date_timedelta = dict(minutes=15)
|
|
# Configure filters by importing a kibana dashboard
|
|
self.filtersFromKibanaDash('bruteforce_ssh_dashboard.json', date_timedelta)
|
|
|
|
# Search aggregations on field 'sourceipaddress', keep 50 samples of events at most
|
|
self.searchEventsAggreg('sourceipaddress', samplesLimit=50)
|
|
# alert when >= 5 matching events in an aggregation
|
|
self.walkAggregations(threshold=2)
|
|
|
|
# Set alert properties
|
|
def onAggreg(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 = 'bruteforce'
|
|
tags = ['ssh']
|
|
severity = 'NOTICE'
|
|
|
|
summary = ('{0} ssh bruteforce attempts by {1}'.format(aggreg['count'], aggreg['value']))
|
|
# append first 3 hostnames
|
|
for e in aggreg['events'][:3]:
|
|
if 'details' in e.keys() and 'hostname' in e['details']:
|
|
summary += ' on {0}'.format(e['_source']['details']['hostname'])
|
|
|
|
# Create the alert object based on these properties
|
|
return self.createAlertDict(summary, category, tags, aggreg['events'], severity) |