diff --git a/data/conf/rspamd/local.d/mime_types_group.conf b/data/conf/rspamd/local.d/mime_types_group.conf
new file mode 100644
index 00000000..b8dae7d0
--- /dev/null
+++ b/data/conf/rspamd/local.d/mime_types_group.conf
@@ -0,0 +1,7 @@
+symbols = {
+    "MIME_DOUBLE_BAD_EXTENSION" {
+        weight = 0; # This rule has dynamic weight up to 4.0
+        description = "Bad extension cloaking";
+        one_shot = true;
+    }
+}