Systemd Executing Binary in Unusual Location Sync RTA (#3766)

Co-authored-by: protectionsmachine <72879786+protectionsmachine@users.noreply.github.com> Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
2024-08-08 08:45:31 -04:00
parent cdc4e21aac
commit aea7d578ed
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+# 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="5b277316-4584-4e4f-8a71-6c7d833e2c30",
+    platforms=["linux"],
+    endpoint=[
+        {
+            "rule_name": "Scheduled Job Executing Binary in Unusual Location",
+            "rule_id": "f2a52d42-2410-468b-9910-26823c6ef822"
+        }
+    ],
+    techniques=["T1543", "T1053"],
+)
+
+
+@common.requires_os(*metadata.platforms)
+def main():
+
+    # Path for the fake systemd script
+    fake_systemd = "/tmp/systemd"
+
+    # Create fake sh executable
+    masquerade = "/tmp/sh"
+    source = common.get_path("bin", "linux.ditto_and_spawn")
+    common.copy_file(source, masquerade)
+
+    # Create a fake systemd script that launches sh
+    with open(fake_systemd, 'w') as script:
+        script.write('#!/bin/bash\n')
+        script.write('/tmp/sh\n')
+
+    # Make the script executable
+    common.execute(['chmod', '+x', fake_systemd])
+    common.execute(['chmod', '+x', masquerade])
+
+    # Execute the fake systemd script
+    common.log("Launching a shell that executes a payload as a child of fake systemd")
+    common.execute([fake_systemd], timeout=5, kill=True, shell=True)
+
+    # Cleanup
+    common.remove_file(fake_systemd)
+
+
+if __name__ == "__main__":
+    exit(main())