eric-forte-elastic
88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
|
|
# or more contributor license agreements. Licensed under the Elastic License
|
|
# 2.0; you may not use this file except in compliance with the Elastic License
|
|
# 2.0.
|
|
|
|
# Name: Network Traffic from InstallUtil
|
|
# RTA: installutil_network.py
|
|
# ATT&CK: T1118
|
|
# Elastic detection: InstallUtil Process Making Network Connections
|
|
# Elastic detection: Unusual Network Activity from a Windows System Binary
|
|
# Description: Uses mock .NET malware and InstallUtil to create network activity from InstallUtil.
|
|
|
|
import sys
|
|
from pathlib import Path
|
|
|
|
from . import RtaMetadata, common
|
|
|
|
metadata = RtaMetadata(
|
|
uuid="6dfa88c9-9fb2-4fb0-8bea-0bc45222b498",
|
|
platforms=["windows"],
|
|
endpoint=[],
|
|
siem=[
|
|
{
|
|
"rule_id": "a13167f1-eec2-4015-9631-1fee60406dcf",
|
|
"rule_name": "InstallUtil Process Making Network Connections",
|
|
},
|
|
{
|
|
"rule_id": "1fe3b299-fbb5-4657-a937-1d746f2c711a",
|
|
"rule_name": "Unusual Network Activity from a Windows System Binary",
|
|
},
|
|
],
|
|
techniques=["T1127", "T1218"],
|
|
)
|
|
|
|
|
|
MY_DOT_NET = common.get_path("bin", "mydotnet.exe")
|
|
|
|
|
|
@common.requires_os(*metadata.platforms)
|
|
@common.dependencies(MY_DOT_NET)
|
|
def main():
|
|
server, ip, port = common.serve_web()
|
|
common.clear_web_cache()
|
|
|
|
target_app = "mydotnet.exe"
|
|
common.patch_file(
|
|
MY_DOT_NET,
|
|
common.wchar(":8000"),
|
|
common.wchar(":%d" % port),
|
|
target_file=target_app,
|
|
)
|
|
|
|
install_util64 = "C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\InstallUtil.exe"
|
|
install_util86 = "C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\InstallUtil.exe"
|
|
fallback = False
|
|
|
|
if Path(install_util64).is_file():
|
|
install_util = install_util64
|
|
elif Path(install_util86).is_file():
|
|
install_util = install_util86
|
|
else:
|
|
install_util = None
|
|
fallback = True
|
|
|
|
if not fallback:
|
|
common.clear_web_cache()
|
|
common.execute([install_util, "/logfile=", "/LogToConsole=False", "/U", target_app])
|
|
|
|
else:
|
|
common.log("Unable to find InstallUtil, creating temp file")
|
|
install_util = Path("InstallUtil.exe").resolve()
|
|
common.copy_file(sys.executable, install_util)
|
|
common.execute(
|
|
[
|
|
install_util,
|
|
"-c",
|
|
"import urllib; urllib.urlopen('http://%s:%d')" % (common.get_ip(), port),
|
|
]
|
|
)
|
|
common.remove_file(install_util)
|
|
|
|
common.remove_file(target_app)
|
|
server.shutdown()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
exit(main())
|