Dairy Queen said Thursday the “Backoff” point-of-sale malware infected systems at 395 of its stores, stealing payment card data.

The company, which has 4,500 independently owned franchises in the U.S., said in a statement it believes the “malware has been contained.” Most of the stores, including one Orange Julius location, were affected for between three weeks to a month starting in early August, according to a list.

“We deeply regret any inconvenience this incident may cause,” wrote CEO and President John Gainor.

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