Just over 100 Checkers and Rally's fast food joints and their customers were victimized by a long-running point-of-sale malware campaign that stole payment card information from purchases taking place as far back as December 2015, Checkers Drive-In Restaurants announced in an online breach notification yesterday.

The Tampa, Florida-based drive-thru chain said that approximately 15 percent of its locations were infected with the POS malware, listing 102 stores in 20 states: Alabama, Arizona, California, Delaware, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Michigan, Nevada, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, West Virginia and Virginia. One additional Checkers and Rally's location will be distributing a separate notification, the company added.

Customer purchase data was exposed over various blocks of time, depending on the location. In some cases, stores were affected over multiple years. A Rally's in Los Angeles appears to the first one infected, with data compromised from Dec. 17, 2015 through March 26, 2018. A cluster of more recent attacks began in October of 2018, with the latest recorded date of compromise cited as April 30, 2019.

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