International Dairy Queen, Inc. (IDQ) reported a malware intrusion affecting 395 U.S. locations, including 9 California franchises. The Backoff malware targeted payment card systems, exposing customer names, card numbers, and expiration dates. The incident was caused by a third-party vendor's compromised credentials. IDQ retained forensic experts, contained the malware, and offered one year of free identity repair services to affected customers.