Since late 2013, this band of cybercriminals has penetrated the digital inner sanctums of more than 100 banks in 40 nations, including Germany, Russia, Ukraine, and the U.S., and stolen about $1.2 billion, according to Europol, the European Union’s law enforcement agency. The string of thefts, collectively dubbed Carbanak—a mashup of a hacking program and the word “bank”—is believed to be the biggest digital bank heist ever. In a series of exclusive interviews with Bloomberg Businessweek, law enforcement officials and computer-crime experts provided revelations about their three-year pursuit of the gang and the mechanics of a caper that’s become the stuff of legend in the digital underworld.
Carbanak’s suspected ringleader is under arrest, but $1.2 billion remains missing, and his malware attacks live on.