protections machine
61 lines
1.9 KiB
Python
61 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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import subprocess
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import sys
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import time
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from pathlib import Path
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from . import RtaMetadata, common
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metadata = RtaMetadata(
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uuid="6a3d9ca4-d010-42c7-b75a-7dc8ce347e59",
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platforms=["linux"],
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endpoint=[
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{
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"rule_name": "Message of the Day Execution Followed by Network Connection",
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"rule_id": "a18e57c9-5627-4535-b994-64febc67c1e8",
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},
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],
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techniques=["T1037", "T1059", "T1071"],
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)
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@common.requires_os(*metadata.platforms)
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def main() -> None:
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parent_process_path = "/etc/update-motd.d/rta"
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child_script_path = "/tmp/child.sh"
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network_command = "exec 3<>/dev/tcp/8.8.8.8/53"
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# Create the fake parent process script
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with Path(parent_process_path).open("w", encoding="utf-8") as parent_script:
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parent_script.write("#!/bin/bash\n")
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parent_script.write(f"{child_script_path}\n")
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# Create the child script that will make the network connection
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with Path(child_script_path).open("w", encoding="utf-8") as child_script:
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child_script.write("#!/bin/bash\n")
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child_script.write(f"{network_command}\n")
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# Make the scripts executable
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common.execute(["chmod", "+x", parent_process_path])
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common.execute(["chmod", "+x", child_script_path])
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# Execute the parent process script
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common.log("Executing the fake parent process script")
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subprocess.Popen([parent_process_path]) # noqa: S603
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# Allow some time for the network connection to be attempted
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time.sleep(5)
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common.log("RTA execution completed.")
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# Cleanup
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common.remove_file(parent_process_path)
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common.remove_file(child_script_path)
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if __name__ == "__main__":
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sys.exit(main())
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