(Bloomberg) -- International Dairy Queen, the ice cream chain owned by Warren Buffett’s Berkshire Hathaway Inc., said customer data were compromised by hackers.

The breach with the so-called Backoff malware affected 395 of more than 4,500 U.S. locations, the unit of Omaha, Nebraska- based Berkshire said today in a statement. The systems contained customer names, and the numbers and expiration dates of their payment cards. Less than 600,000 cards were affected, said Dean Peters, a spokesman for Dairy Queen.

The Backoff software has been used to target more than 1,000 businesses, according to the U.S. Secret Service. Dairy Queen said it will provide identity-repair services for a year to customers of the locations that were struck.

“We are committed to working with and supporting our affected DQ and Orange Julius franchise owners to address this incident,” John Gainor, chief executive officer of Dairy Queen, said in the statement. Almost all Dairy Queen locations are independently owned and operated.

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