Ice cream and fast food outlet Dairy Queen said a data breach that ran from August to October involved the theft of customer data at 395 of its stores.

In a statement posted to the company's website, Dairy Queen CEO John Gainor wrote, "We discovered evidence that the systems of some DQ locations and one Orange Julius location were infected with the widely-reported Backoff malware that is targeting retailers across the country."

"The investigation revealed that a third-party vendor's compromised account credentials were used to access systems at those locations," Gainor added.

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