US burger chain Sonic’s shares fell two per cent yesterday, following a malware attack at some of its drive-in outlets.
The company did not disclose the outlets or a specific time frame. It is also unclear how many customers were affected by the breach, which was first reported by Krebs on Security last week.
“The ongoing breach may have led to a fire sale on millions of stolen credit and debit card accounts that are now being peddled in shadowy underground cybercrime stores,” Krebs on Security said.
In a statement, Sonic said: “Your trust in Sonic is important to us and we sincerely regret any inconvenience this may cause. We have provided here more information about this situation, including an offer of free identity theft protection for affected customers.”