Restaurant company Roy's Holdings, which runs six restaurants in Hawaii, recently began notifying an undisclosed number of customers that their credit card information may have been compromised after an employee's desktop PC was infected with malware.

Customers who used credit or debit cards at Roy's restaurants in Ko'Olina, Waikiki, Kaanapali, Poipu and Waikoloa between February 1, 2013 and February 25, 2013 may be affected, according to a company statement [PDF file].

Following the breach, the company says it reported the breach to the U.S. Secret Service, engaged security and forensics investigators to determine the nature and scope of the breach, strengthened Roy's software and servers, worked with legal and security experts to identity and implement additional safeguards, and notified Visa, MasterCard and American Express.

The company is advising suggested customers to review their account statements for any unusual activity, and to consider placing a fraud alert on their credit files. Customers with questions are advised to call (877) 215-3618 and refer to reference number 1722061113.