The Wall Street Journal is reporting that the TJX break-in started in July 2005 with a wireless hack of a Marshalls in St. Paul, Minn, where the thieves "pointed a telescope-shaped antenna toward the store and used a laptop computer to decode data streaming through the air between hand-held price-checking devices, cash registers [POS presumably]and the store's computers. That helped them hack into the central database of Marshalls' parent, TJX, to repeatedly purloin information about customers."
The news that the attack was wireless is not unexpected, as wireless attacks have become very popular means of attacking retail chains and because hints that the TJX attacks were wirelessly based have been frequent. But the level of specifics in the Journal story are surprising. Read more.