Egress Network Connection by MOTD Child Sync RTA (#3945)

Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
2024-08-08 23:00:03 +10:00
parent aea7d578ed
commit fff326a7d4
1 changed files with 53 additions and 0 deletions
@@ -0,0 +1,53 @@
+# 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="a67ba2b1-cace-4cb9-9b7e-12c9ffe136cb",
+    platforms=["linux"],
+    endpoint=[
+        {
+            "rule_name": "Egress Network Connection by MOTD Child",
+            "rule_id": "da02d81a-d432-4cfe-8aa4-fc1a31c29c98"
+        }
+    ],
+    techniques=["T1037", "T1059", "T1071"],
+)
+
+
+@common.requires_os(*metadata.platforms)
+def main():
+
+    # Path for the fake motd executable
+    masquerade = "/etc/update-motd.d/rta"
+    source = common.get_path("bin", "netcon_exec_chain.elf")
+
+    common.log("Creating a fake motd executable..")
+    common.copy_file(source, masquerade)
+    common.log("Granting execute permissions...")
+    common.execute(['chmod', '+x', masquerade])
+
+    # Execute the fake motd executable
+    common.log("Executing the fake motd executable..")
+    commands = [
+        masquerade,
+        'chain',
+        '-h',
+        '8.8.8.8',
+        '-p',
+        '53',
+        '-c',
+        '/etc/update-motd.d/rta netcon -h 8.8.8.8 -p 53'
+    ]
+    common.execute([*commands], timeout=5, kill=True)
+
+    # Cleanup
+    common.remove_file(masquerade)
+
+
+if __name__ == "__main__":
+    exit(main())