Dairy Queen has confirmed that Backoff point-of-sale malware was used in a payment card breach that affected 395 of its 4,500 franchised U.S. locations.
The ice cream and fast food chain says more than half a million cards may have been compromised.
"I cannot identify a specific number of cards that may have been impacted by this issue because we do not have visibility into the detailed card-transaction data at all affected stores," Dairy Queen spokesman Dean Peters tells Information Security Media Group. "However, we do believe that the number of unique cards affected were less than 600,000."
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