Secure credit card information was compromised at a dozen Chicago area restaurant locations during a massive data breach at Landry’s restaurants and Golden Nugget Casinos nationwide.

Landry’s released the list of restaurants Friday that were affected at different times during one or both of the following periods, according to the company: May 4, 2014 through March 15, 2015 and from May 5, 2015 through December 3, 2015.

The investigation into the security breach began in December after receiving reports of suspicious activity on customers’ cards that had been used at their establishments, according to the announcement.

Findings showed that hackers were able to install a program on payment card processing devices at certain restaurants, food and beverage outlets, spas, entertainment destinations, and managed properties.

“The program was designed to search for data from the magnetic stripe of payment cards that had been swiped (cardholder name, card number, expiration date and internal verification code) as the data was being routed through affected systems,” the company spokesperson wrote.

Landry’s says heightened security measures have since been implemented to prevent similar situations happening in the future. Card owners that used a payment card at one of their affected locations during the periods of the breach will be mailed a letter or sent an e-mail with more information.

“If you used a payment card at an affected location during its at-risk window, we recommend that you remain vigilant to the possibility of fraud by reviewing your payment card statements for any unauthorized activity,” the company asked. “You should immediately report any unauthorized charges to your card issuer because payment card rules generally provide that cardholders are not responsible for unauthorized charges reported in a timely manner.”

Landry’s and Golden Nugget asks any customers with further questions to call (877) 238-2151 (U.S. and Canada), Monday through Friday from 9:00 am to 7:00 pm EST.

The list of Chicago area restaurants reported to be affected during the corresponding time frames are below, with additional establishments nationwide available on their website:

  • Bubba Gump Shrimp Co. in Chicago: May 8 to Dec. 3, 2015
  • Capis Italian Kitchen in Chicago: Nov. 16, 2014
  • Claim Jumper in Lombard: May 5 to Dec. 3, 2015
  • Mastro’s in Chicago: May 5 to Dec. 3, 2015
  • McCormick Schmick’s
    – Chesnut Street location in Chicago: May 9, 2014 to Dec. 3, 2015
    – East Wacker Street location in Chicago: May 9, 2014 to March 14, 2015; May 8 to Dec. 3, 2015
    – Oak Brook location: May 9, 2014 to March 14, 2015; May 8 to Dec. 3, 2015
  • Morton’s
    – East Wacker Place location: May 10, 2014 to March 14, 2015; May 8 to Dec. 3, 2015
    – State Street location: May 10, 2014 to March 14, 2015; May 8 to Dec. 3, 2015
    – Schaumburg location: May 5 to Dec. 3, 2015
  • Rainforest Café
    – Downtown Chicago location: May 8 to Dec. 3, 2015
    – Woodfield Mall location in Schaumburg: May 8 to Dec. 3, 2015

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Article source: http://www.nbcchicago.com/news/local/Chicago-Area-Restaurants-Affected-by-Credit-Card-Data-Breach-367367951.html