eric-forte-elastic
81 lines
2.4 KiB
Python
81 lines
2.4 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: Overwrite Accessibiity Binaries
|
|
# RTA: sticky_keys_write_execute.py
|
|
# signal.rule.name: Potential Modification of Accessibility Binaries
|
|
# signal.rule.name: Local Service Commands
|
|
# signal.rule.name: Persistence via TelemetryController Scheduled Task Hijack
|
|
# ATT&CK: T1015
|
|
# Description: Writes different binaries into various accessibility locations.
|
|
|
|
import time
|
|
from pathlib import Path
|
|
|
|
from . import RtaMetadata, common
|
|
|
|
metadata = RtaMetadata(
|
|
uuid="398933ec-f8d4-4d81-93ed-e7d7adcb9d97",
|
|
platforms=["windows"],
|
|
endpoint=[],
|
|
siem=[
|
|
{
|
|
"rule_id": "7405ddf1-6c8e-41ce-818f-48bea6bcaed8",
|
|
"rule_name": "Potential Modification of Accessibility Binaries",
|
|
},
|
|
{
|
|
"rule_id": "68921d85-d0dc-48b3-865f-43291ca2c4f2",
|
|
"rule_name": "Persistence via TelemetryController Scheduled Task Hijack",
|
|
},
|
|
],
|
|
techniques=["T1546", "T1053"],
|
|
)
|
|
|
|
|
|
@common.requires_os(*metadata.platforms)
|
|
def main():
|
|
# Prep
|
|
bins = [
|
|
"sethc.exe",
|
|
"utilman.exe",
|
|
"narrator.exe",
|
|
"magnify.exe",
|
|
"osk.exe",
|
|
"displayswitch.exe",
|
|
"atbroker.exe",
|
|
]
|
|
calc = Path("\\windows\\system32\\calc.exe").resolve()
|
|
temp = Path("temp.exe").resolve()
|
|
|
|
# loop over bins
|
|
for bin_name in bins:
|
|
|
|
bin_path = Path("\\Windows\\system32\\" + bin_name).resolve()
|
|
|
|
# Back up bin
|
|
common.copy_file(bin_path, temp)
|
|
|
|
# Change Permissions to allow modification
|
|
common.execute(["takeown", "/F", bin_path, "/A"])
|
|
common.execute(["icacls", bin_path, "/grant", "Administrators:F"])
|
|
|
|
# Copy Calc to overwrite binary, then run it
|
|
common.copy_file(calc, bin_path)
|
|
common.execute(bin_path, kill=True, timeout=1)
|
|
|
|
# Restore Original File and Permissions on file
|
|
common.copy_file(temp, bin_path)
|
|
common.execute(["icacls", bin_path, "/setowner", "NT SERVICE\\TrustedInstaller"])
|
|
common.execute(["icacls", bin_path, "/grant:r", "Administrators:RX"])
|
|
common.remove_file(temp)
|
|
|
|
# Cleanup
|
|
time.sleep(2)
|
|
common.execute(["taskkill", "/F", "/im", "calculator.exe"])
|
|
|
|
|
|
if __name__ == "__main__":
|
|
exit(main())
|