app_bundler_execution.py

# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
# or more contributor license agreements. Licensed under the Elastic License
# 2.0; you may not use this file except in compliance with the Elastic License
# 2.0.

from . import common
from . import RtaMetadata


metadata = RtaMetadata(
    uuid="ea7c50ad-5736-48c7-bf39-50f708710826",
    platforms=["macos"],
    endpoint=[
        {
            "rule_name": "Script Execution via macOS Application Bundle",
            "rule_id": "94a891a9-3771-4a8c-a6ca-82fa66cfd7e2",
        }
    ],
    siem=[],
    techniques=["T1553", "T1059"],
)


@common.requires_os(*metadata.platforms)
def main():

    # create masquerades
    masquerade = "/tmp/launchd"
    masquerade2 = "/tmp/bash"
    masquerade3 = "/tmp/curl"
    common.create_macos_masquerade(masquerade)
    common.create_macos_masquerade(masquerade2)
    common.create_macos_masquerade(masquerade3)

    # Execute command
    common.log("Launching fake macOS application bundler commands")
    command = f"{masquerade2} test.app/Contents/MacOS/test-psntest"
    common.execute([masquerade, "childprocess", command], timeout=10, kill=True)
    common.execute([masquerade2, "childprocess", masquerade3], timeout=10, kill=True)

    # cleanup
    common.remove_file(masquerade)
    common.remove_file(masquerade2)


if __name__ == "__main__":
    exit(main())