Jesse Sant
55 lines
1.9 KiB
Python
55 lines
1.9 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: Compression of sensitive files
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# RTA: linux_compress_sensitive_files.py
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# Description: Uses built-in commands for *nix operating systems to compress known sensitive
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# files, such as etc/shadow and etc/passwd
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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="f3ffa89b-de47-4e17-ac8e-385e0e7f8253",
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platforms=["linux"],
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endpoint=[],
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siem=[{"rule_id": "6b84d470-9036-4cc0-a27c-6d90bbfe81ab", "rule_name": "Sensitive Files Compression"}],
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techniques=["T1560", "T1552"],
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)
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@common.requires_os(*metadata.platforms)
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def main():
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common.log("Compressing sensitive files")
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files = ["totally-legit.tar", "official-business.zip", "expense-reports.gz"]
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# we don't want/need these to actually work, since the rule is only looking for command line, so no need for sudo
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commands = [
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["tar", "-cvf", files[0], "/etc/shadow"],
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["zip", files[1], "/etc/passwd"],
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["gzip", "/etc/group", files[2]],
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]
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for command in commands:
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masquerade = f"/tmp/{command[0]}"
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source = common.get_path("bin", "linux.ditto_and_spawn")
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common.copy_file(source, masquerade)
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masquerade_command = command
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masquerade_command[0] = masquerade
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try:
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common.execute(masquerade_command, timeout=2, kill=True)
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except OSError as exc:
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# command doesn't exist on distro - the rule only needs one to trigger
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# also means we will eventually need to explore per distro ground truth when we expand as counts will vary
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common.log(str(exc))
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common.remove_file(masquerade)
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if __name__ == "__main__":
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main()
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