Justin Ibarra
34 lines
1.1 KiB
Python
34 lines
1.1 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: Certutil Encode / Decode
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# RTA: certutil_file_obfuscation.py
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# ATT&CK: T1140
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# signal.rule.name: Encoding or Decoding Files via CertUtil
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# Description: Uses certutil to create an encoded copy of cmd.exe. Then uses certutil to decode that copy.
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import os
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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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common.log("Encoding target")
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encoded_file = os.path.abspath('encoded.txt')
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decoded_file = os.path.abspath('decoded.exe')
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common.execute(["c:\\Windows\\System32\\certutil.exe", "-encode", "c:\\windows\\system32\\cmd.exe", encoded_file])
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common.log("Decoding target")
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common.execute(["c:\\Windows\\System32\\certutil.exe", "-decode", encoded_file, decoded_file])
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common.log("Cleaning up")
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common.remove_file(encoded_file)
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common.remove_file(decoded_file)
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if __name__ == "__main__":
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exit(main())
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