they used highly sophisticated and nearly undedebtable malware named kartosha. it's a computer program placed in a company's system to corrupt point of sale systems. the register itself your information was being grabbed. many retail organizations may not know they've been infected. the software infests retail processing systems, allowing the hackers to manipulate the malware from the outside and most troubling of all, it's using new technology that makes it virtually undetectable by all security software. >> it's an unknown exploit, one they haven't seen before. >> just who are the hackers? there are clues. part of the code is written in russian. the "wall street journal" cites an unnamed u.s. official who said these details suggest the attack may have ties to organized crime from the former