Target CEO and President Gregg Steinhaffel confirmed in an interview with CNBC that the stores PoS (point-of-sale) terminals were infected with malware, which has since been removed. Target has verified that PIN numbers were stolen during the breach. However, Target representatives have stated this informationalong with customer names and card numberswas encrypted within their systems. In 2007, TJX, who owns T.J. Maxx and Marshalls, suffered a breach that compromised more than 45 million card numbers and cost the company $256 million.”]
Source: https://blog.malwarebytes.com/cybercrime/2013/12/target-us-stores-suffer-from-massive-data-breach/