diff --git a/modules/processing/parsers/CAPE/DridexLoader.py b/modules/processing/parsers/CAPE/DridexLoader.py
index dd43ba90708..c5f64fbe0df 100644
--- a/modules/processing/parsers/CAPE/DridexLoader.py
+++ b/modules/processing/parsers/CAPE/DridexLoader.py
@@ -53,6 +53,8 @@
 
 
 def decrypt_rc4(key, data):
+    if not key:
+        return b""
     cipher = ARC4.new(key)
     return cipher.decrypt(data)