Eric Forte
62 lines
2.3 KiB
Python
62 lines
2.3 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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import os
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import pathlib
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import sys
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from . import RtaMetadata, common
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metadata = RtaMetadata(
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uuid="c69a06f3-3873-4d5d-8584-035e0921b4a8",
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platforms=["macos", "linux"],
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endpoint=[
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{
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"rule_id": "15019d7c-42e6-4cf7-88b0-0c3a6963e6f5",
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"rule_name": "Suspicious Recursive File Deletion via Built-In Utilities",
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},
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],
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siem=[],
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techniques=["T1565", "T1485"],
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)
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@common.requires_os(*metadata.platforms)
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def main() -> None:
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masquerade = "/tmp/xargs"
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masquerade2 = "/tmp/rm"
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# used only for linux at 2 places to enumerate xargs as parent process.
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working_dir = "/tmp/fake_folder/xargs"
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if common.CURRENT_OS == "linux":
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# Using the Linux binary that simulates parent-> child process in Linux
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source = common.get_path("bin", "linux_ditto_and_spawn_parent_child")
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common.copy_file(source, masquerade)
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common.copy_file(source, masquerade2)
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# As opposed to macos, where the masquerade is being projected as parent process,
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# in linux the working directory is being projected as parent process.
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# Hence, to simulate the parent process without many changes to execute logic
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# a fake folder structure is created for execution.
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# The execution working directory is changed to the fake folder, to simulate as xargs parent process in Linux.
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pathlib.Path(working_dir).mkdir(parents=True, exist_ok=True)
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os.chdir(working_dir)
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else:
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common.create_macos_masquerade(masquerade)
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common.create_macos_masquerade(masquerade2)
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# Execute command
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common.log("Launching fake builtin commands to recursively delete")
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command = f"{masquerade2} -rf arg1 arg2 arg3 arg4 arg5 arg6 arg7 arg8 arg9 arg10 /home/test"
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common.execute([masquerade, "childprocess", command], timeout=10, kill=True, shell=True) # noqa: S604
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# cleanup
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common.remove_file(masquerade)
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common.remove_file(masquerade2)
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if common.CURRENT_OS == "linux":
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common.remove_directory(working_dir)
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if __name__ == "__main__":
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sys.exit(main())
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