Jason's Deli fell victim to a data breach that impacted up to 2 million customers in 15 states.The Texas-based restaurant chain said cyber thieves used RAM-scraping malware to infiltrate payment processing systems at 164 locations in Alabama, Arizona, Florida, Georgia, Illinois, Louisiana, Maryland, North Carolina, Nevada, Pennsylvania, South Carolina, Tennessee, Texas, Virginia and Wisconsin.The same type of malicious software was used by hackers in the 2013 Target data breach that impacted up to 40 million people. The company said the incident affected customers' payment card numbers, cardholder names, expiration dates and service codes from June to December 2017. "On December 22, 2017, Jason’s Deli was notified by payment processors that credit card security personnel had informed it that a large quantity of payment card information had appeared for sale on the 'dark web,'" the corporation said in a statement last week. Jason's Deli is working with third-party cybersecurity firms and federal law enforcement to investigate the breach.A full list of impacted locations can be found here.If you believe you may have been affected by the incident, remain vigilant. Check payment card statements regularly and report suspicious activity to your bank or card provider immediately.Contact Equifax, TransUnion or Experian to place an alert on your account, which will remain active for 90 days. Corporate data breaches are increasing in frequency, and it's estimated they'll cost businesses a total of $8 trillion over the next five years, according to a report from market intelligence firm Juniper Research.