Fast-food runner Sonic notified of unusual credit card activity

U.S. fast-food chain operator Sonic Corp said on Tuesday it had been notified of unusual activity regarding credit cards used at its drive-in outlets.

Sonic’s credit card processor informed the company earlier this week of the activity, which could have affected an unknown number of its payment systems.

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Cyber security blog KrebsOnSecurity first reported the news and added that the activity may have led to millions of stolen credit and debit card numbers being sold in underground exchanges.