Sears-owned retailer Kmart has declared that it has suffered a massive data breach. The company said late Friday that a malware attack that began harvesting data from it its point-of-sale computer systems in early September was “new form of malware” and “similar to a computer virus.” Few details have been released by Kmart, but the company warns that it could include every shopper between September 1 and Thursday, October 9. Online shoppers were not impacted by the breach….
