Though no details of the how the hack attack was executed have been released by Target, the FBI or other agencies investigating the breach, it is likely that the processing machines themselves were compromised. Target claims that the hack was sophisticated, but on the technical side, once hackers found a way into the credit card processing machines, probably via remote entry from servers somewhere in Eastern Europe or Russia, the theft of credit card data itself would have been fairly straight forward by using scripts or applications that simply capture the data and send it off to servers owned by the hackers.