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sysmon-Broker.py
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#!/usr/bin/env python
# This script handles Sysmon Configuration Change events and writes to sysmon_configChange.log.
# Version 1.0 (November 2018)
#
# Authors: Jeff Atkinson (jatkinson@salesforce.com)
#
# Copyright (c) 2017, salesforce.com, inc.
# All rights reserved.
# Licensed under the BSD 3-Clause license.
# For full license text, see LICENSE.txt file in the repo root or https://opensource.org/licenses/BSD-3-Clause
from argparse import ArgumentParser
import broker
import json
import pprint
import time
_DESCRIPTION = '''Convert Windows Event Log data into Bro events and transmit
them via a broker topic.
'''
def generic_event(winevt):
try:
message = broker.bro.Event(
'WindowsEvent',
str(winevt.get('computer_name')),
str(winevt.get('log_name')),
int(winevt.get('event_id')),
str(winevt.get('opcode')),
str(winevt.get('task', 'None')),
str(winevt.get('message', 'None')),
str(winevt.get('event_data', 'None')),
)
except Exception as e:
print(e)
return
#return None
return message
def logon_success(winevt):
evt_data = winevt.get('event_data')
def object_sacl_changed(winevt):
evt_data = winevt.get('event_data')
def process_creation(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'process_created',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('ProcessId','ProcessID not provided').encode('ascii','ignore'),
evt_data.get('CommandLine','CommandLine not provided').encode('ascii','ignore'),
evt_data.get('Company','Company not provided').encode('ascii','ignore'),
evt_data.get('CurrentDirectory','CurrentDirectory not provided').encode('ascii','ignore'),
evt_data.get('Description','Description not provided').encode('ascii','ignore'),
evt_data.get('FileVersion','FileVersion not provided').encode('ascii','ignore'),
evt_data.get('Hashes','Hashes not provided').encode('ascii','ignore'),
evt_data.get('Image','Image not provided').encode('ascii','ignore'),
evt_data.get('IntegrityLevel','IntegrityLevel not provided').encode('ascii','ignore'),
evt_data.get('LogonGuid','LogonGuid not provided').encode('ascii','ignore'),
evt_data.get('LogonId','LogonId not provided').encode('ascii','ignore'),
evt_data.get('ParentCommandLine','ParentCommandLine not provided').encode('ascii','ignore'),
evt_data.get('ParentImage','ParentImage not provided').encode('ascii','ignore'),
evt_data.get('ParentProcessGuid','ParentProcessGuid not provided').encode('ascii','ignore'),
evt_data.get('ParentProcessId','ParentProcessId not provided').encode('ascii','ignore'),
evt_data.get('ProcessGuid','ProcessGuid not provided').encode('ascii','ignore'),
evt_data.get('Product','Product not provided').encode('ascii','ignore'),
evt_data.get('TerminalSessionId','TerminalSessionId not provided').encode('ascii','ignore'),
evt_data.get('User','User not provided').encode('ascii','ignore'),
evt_data.get('UtcTime','UtcTime not provided').encode('ascii','ignore'),
)
except Exception as e:
#print e;
return
return message
def process_change_file(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'process_change_file_time',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('TargetFilename','None').encode('ascii','ignore'),
evt_data.get('CreationUtcTime','None').encode('ascii','ignore'),
evt_data.get('PreviousCreationUtcTime','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def network_connection(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_networkConnection',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('Protocol','None').encode('ascii','ignore'),
evt_data.get('SourceIp','None').encode('ascii','ignore'),
evt_data.get('SourcePort','None').encode('ascii','ignore'),
evt_data.get('DestinationIp','None').encode('ascii','ignore'),
evt_data.get('DestinationPort','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def service_change(winevt):
return
print "service_change"
def process_terminated(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_procTerminate',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def driver_loaded(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_driverLoaded',
winevt.get('computer_name').encode('ascii','ignore'),
winevt.get('process_id','None'),
evt_data.get('Hashes','None').encode('ascii','ignore'),
evt_data.get('ImageLoaded','None').encode('ascii','ignore'),
evt_data.get('Signature','None').encode('ascii','ignore'),
evt_data.get('SignatureStatus','None').encode('ascii','ignore'),
evt_data.get('Signed','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
#evt_data.get('','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def image_loaded(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_imageLoaded',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('ImageLoaded','None').encode('ascii','ignore'),
evt_data.get('Hashes','None').encode('ascii','ignore'),
evt_data.get('Signed','None').encode('ascii','ignore'),
evt_data.get('SignatureStatus','None').encode('ascii','ignore'),
#evt_data.get('','None').encode('ascii','ignore'),
)
except Exception as e:
return
return message
def create_remote_thread(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_createRemoteThread',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('SourceProcessGuid','None').encode('ascii','ignore'),
evt_data.get('SourceProcessId','None').encode('ascii','ignore'),
evt_data.get('SourceImage','None').encode('ascii','ignore'),
evt_data.get('TargetProcessGuid','None').encode('ascii','ignore'),
evt_data.get('TargetProcessId','None').encode('ascii','ignore'),
evt_data.get('TargetImage','None').encode('ascii','ignore'),
evt_data.get('NewThreadId','None').encode('ascii','ignore'),
evt_data.get('StartAddress','None').encode('ascii','ignore'),
evt_data.get('StartModule','None').encode('ascii','ignore'),
evt_data.get('StartFunction','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def raw_access_read(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_rawAccessRead',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('Device','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def process_access(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_processAccess',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('GrantedAccess','None').encode('ascii','ignore'),
evt_data.get('SourceImage','None').encode('ascii','ignore'),
evt_data.get('SourceProcessGuid','None').encode('ascii','ignore'),
evt_data.get('SourceProcessId','None').encode('ascii','ignore'),
evt_data.get('SourceThreadId','None').encode('ascii','ignore'),
evt_data.get('TargetImage','None').encode('ascii','ignore'),
evt_data.get('TargetProcessGUID','None').encode('ascii','ignore'),
evt_data.get('TargetProcessId','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('CallTrace','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def file_create(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_fileCreate',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('TargetFilename','None').encode('ascii','ignore'),
evt_data.get('CreationUtcTime','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def registry_event(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_registryEvent',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('TargetFilename','None').encode('ascii','ignore'),
evt_data.get('CreationUtcTime','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('Details','None').encode('ascii','ignore'),
evt_data.get('NewName','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def file_create_stream_hash(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_fileCreateStreamHash',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
evt_data.get('TargetFilename','None').encode('ascii','ignore'),
evt_data.get('CreationUtcTime','None').encode('ascii','ignore'),
evt_data.get('Hash','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def config_change(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_configChange',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('Configuration','None').encode('ascii','ignore'),
evt_data.get('ConfigurationFileHash','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def pipe_event(winevt):
if winevt['event_id'] == 17:
action = "PipeCreated"
if winevt['event_id'] == 18:
action = "PipeConnected"
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_pipeEvent',
winevt.get('computer_name').encode('ascii','ignore'),
action,
evt_data.get('UtcTime','None').encode('ascii','ignore'),
evt_data.get('ProcessGuid','None').encode('ascii','ignore'),
evt_data.get('ProcessId','None').encode('ascii','ignore'),
evt_data.get('PipeName','None').encode('ascii','ignore'),
evt_data.get('Image','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def wmi_event_19(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_wmiEvent19',
winevt.get('computer_name').encode('ascii','ignore'),
winevt.get('process_id',None),
winevt.get('EventNamespace','None').encode('ascii','ignore'),
evt_data.get('EventType','None').encode('ascii','ignore'),
evt_data.get('Name','None').encode('ascii','ignore'),
evt_data.get('Operation','None').encode('ascii','ignore'),
evt_data.get('Query','None').encode('ascii','ignore'),
evt_data.get('User','None').encode('ascii','ignore'),
evt_data.get('UtcTime','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def wmi_event_20(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_wmiEvent20',
winevt.get('computer_name').encode('ascii','ignore'),
winevt.get('process_id',None),
evt_data.get('Destination','None').encode('ascii','ignore'),
evt_data.get('EventType','None').encode('ascii','ignore'),
evt_data.get('Operation','None').encode('ascii','ignore'),
evt_data.get('Type','None').encode('ascii','ignore'),
evt_data.get('User','None').encode('ascii','ignore'),
evt_data.get('UTC','None').encode('ascii','ignore'),
)
except Exception as e:
print e;
return
return message
def wmi_event_21(winevt):
evt_data = winevt['event_data']
try:
message = broker.bro.Event(
'sysmon_wmiEvent21',
winevt.get('computer_name').encode('ascii','ignore'),
evt_data.get('BootStatusPolicy','None').encode('ascii','ignore'),
evt_data.get('LastBootGood','None').encode('ascii','ignore'),
evt_data.get('LastBootId','None').encode('ascii','ignore'),
evt_data.get('LastShutdownGood','None').encode('ascii','ignore'),
)
except Exception as e:
#print e
return
return message
def sysmon_error(winevt):
print "Error"
_security_event_map = {
# 4634: logoff_success,
#4907: object_sacl_changed,
}
_system_event_map = dict(
)
_sysmon_event_map = {
1: process_creation,
2: process_change_file,
3: network_connection,
4: service_change,
5: process_terminated,
6: driver_loaded,
7: image_loaded,
8: create_remote_thread,
9: raw_access_read,
10: process_access,
11: file_create,
12: registry_event,
13: registry_event,
14: registry_event,
15: file_create_stream_hash,
16: config_change,
17: pipe_event,
18: pipe_event,
19: wmi_event_19,
20: wmi_event_20,
21: wmi_event_21,
25: sysmon_error
}
_event_map = {
"Security": _security_event_map,
"System": _system_event_map,
#Sysmon: _sysmon_event_map
"Microsoft-Windows-Sysmon/Operational": _sysmon_event_map
}
def main(c, file_in):
with open(file_in, 'r') as f:
# for line in f:
while 1:
where = f.tell()
line = f.readline()
if not line:
time.sleep(1)
f.seek(where)
else:
try:
winevt = json.loads(line)
except JSONDecodeError:
print("JSON Decode Error")
continue
if winevt['event_id'] == 19:
print winevt
if str(winevt.get('log_name')) == 'Microsoft-Windows-Sysmon/Operational':
myLogName = 'Sysmon'
else:
myLogName = winevt['log_name']
# this is a bit complicated, so to break it down:
# 1. Look in _event_map for a log name to map events to a func
# if it doesn't match, return a dict so that nothing is wrong
# in the following call where:
# 2. An event is then mapped with event_id using one of the
# specific event log maps. If one doesn't match, then the
# generic event handler is used.
build_message = _event_map.get(str(winevt.get('log_name')),
dict()).get(winevt.get('event_id'), generic_event)
# use the matched event handler and publish it to the winevt
# broker topic
msg = build_message(winevt)
# if they error, the event handlers return None
if msg:
c.publish('/sysmon', msg)
continue
if __name__ == '__main__':
p = ArgumentParser(description=_DESCRIPTION)
p.add_argument('broker_peer',
help='Peer to connect to.')
p.add_argument('file_in',
help='File to read events from.')
args = p.parse_args()
c = broker.Endpoint()
c.peer(args.broker_peer, 9999 )
main(c, args.file_in)