Lowercase msg before matching

core/lib/rules.py

@@ -76,6 +76,18 @@ def process_rules(data):
                                     break
                         # Continue to next field
                         continue
+
+                    # Allow partial matches for msg
+                    if field == "msg":
+                        for msg in value:
+                            if "msg" in message:
+                                if msg.lower() in message["msg"].lower():
+                                    matched_field_number += 1
+                                    matched_fields.append(field)
+                                    # Break out of the msg matching loop
+                                    break
+                        # Continue to next field
+                        continue
                     if field in message and message[field] in value:
                         matched_field_number += 1
                         matched_fields.append(field)