Sync RTA System Binary Proxy Execution via ld.so (#4176)

Co-authored-by: shashank-elastic <[email protected]>

(cherry picked from commit bc821f5)

Author: protectionsmachine

rta/linux_defense_evasion_proxy_execution_via_ld_so.py

@@ -0,0 +1,47 @@
+# 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.
+
+import sys
+from . import RtaMetadata, common
+
+metadata = RtaMetadata(
+    uuid="e2a136e5-bda1-41c4-8143-514c0b0784c4",
+    platforms=["linux"],
+    endpoint=[
+        {
+            "rule_name": "System Binary Proxy Execution via ld.so",
+            "rule_id": "10cb6563-35a9-45b7-a394-e7bca6fd5bed",
+        },
+    ],
+    techniques=["T1218", "T1059"],
+)
+
+
+@common.requires_os(*metadata.platforms)
+def main() -> None:
+    common.log("Creating a fake executable..")
+    masquerade = "/lib/ld-linux-foo.so"
+    masquerade2 = "/tmp/sh"
+
+    source = common.get_path("bin", "linux.ditto_and_spawn")
+    common.copy_file(source, masquerade)
+    common.log("Granting execute permissions...")
+    common.execute(["chmod", "+x", masquerade])
+
+    source = common.get_path("bin", "linux.ditto_and_spawn")
+    common.copy_file(source, masquerade2)
+    common.log("Granting execute permissions...")
+    common.execute(["chmod", "+x", masquerade2])
+
+    commands = [masquerade, masquerade, '-c', 'whoami']
+    common.execute([*commands], timeout=5, kill=True)
+    common.log("Cleaning...")
+    common.remove_file(masquerade)
+    common.remove_file(masquerade2)
+    common.log("Simulation successfull!")
+
+
+if __name__ == "__main__":
+    sys.exit(main())