Malware Cited in Supermarket Data Breach - New York Times

A stark reality check

Unauthorized software that was secretly installed on servers in Hannaford Bros. Co.'s supermarkets across the Northeast and in Florida enabled the massive data breach that compromised up to 4.2 million credit and debit cards, the company said Friday.

[...]

The breach has prompted concern in the industry because it appeared to be the first large-scale theft of credit and debit card numbers while the information was in transit.

Malware Cited in Supermarket Data Breach - New York Times