From 55e26f28d28b8bd15ec152f6a3b4b8fd8324463c Mon Sep 17 00:00:00 2001
From: protections machine
 <72879786+protectionsmachine@users.noreply.github.com>
Date: Wed, 23 Oct 2024 16:07:38 +1100
Subject: [PATCH] Sync RTA Potential Proxy Execution via Split (#4178)

Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>

(cherry picked from commit 519a3688c8bfa083bac28b677950d950c6cb540a)
---
 ...fense_evasion_proxy_execution_via_split.py | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 rta/linux_defense_evasion_proxy_execution_via_split.py

diff --git a/rta/linux_defense_evasion_proxy_execution_via_split.py b/rta/linux_defense_evasion_proxy_execution_via_split.py
new file mode 100644
index 00000000000..80f3c9e1072
--- /dev/null
+++ b/rta/linux_defense_evasion_proxy_execution_via_split.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="529c5cfd-4ceb-43a1-a006-40e072e4906c",
+    platforms=["linux"],
+    endpoint=[
+        {
+            "rule_name": "Potential Proxy Execution via Split",
+            "rule_id": "0c63849b-2e23-4720-9608-0a402d093d3c",
+        },
+    ],
+    techniques=["T1218", "T1059"],
+)
+
+
+@common.requires_os(*metadata.platforms)
+def main() -> None:
+    common.log("Creating a fake executable..")
+    masquerade = "/tmp/split"
+    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, '--filter=foo', '-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())