Jewel-Osco hit again by data hack - hacker installed malware into the portion of Supervalu's computer network that processes payment cards at some of its Cub stores, as well as its Shop'n Save and Shoppers Food & Pharmacy chains located respectively in the St. Louis and the Washington, D.C., areas.  Supervalu believes the malware may have succeeded in capturing account numbers, and in some cases, expiration dates, and cardholders' names at the four stores.;