LAS VEGAS, NEV. — To gain a grasp of just how badly organized cyber-crime groups are fleecing American banks and consumers, it may be instructive to look at the details released this week about the operations of a single online crime gang, that is responsible for undoubtedly the largest cache of stolen data ever uncovered. The info comes from Joe Stewart, a researcher with Atlanta based SecureWorks who has been studying the operations of a group responsible for distributing “Coreflood,” a remote-access Trojan that the bad guys are using to hide their activities online and steal data from infected systems. By gaining access to an online server used to control the CoreFlood network, Stewart was able to gain a rare glimpse inside the operations of an operation that compromised more than 378,000 systems over the past 16 months. He found more than 500 gigabytes of stolen banking credentials and other