
According to a 1/2/18 statement from the retailer, PoS devices used to facilitate customer purchases at some stores was not "always on," leading to the installation of malware and unauthorized network access. The malware searched for payment track data and gleaned information from cards including card numbers, expiration dates, and internal verification codes. Some cardholder names were also stolen. The malware was operating on the retailer's POS system from April 3, 2017, to November 18, 2017.
It's not yet known how many stores or customers were involved in the data breach.
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