Investigators raced to figure out how the Russians had gotten inside. The answer was pretty shocking: The Russians had left USB drives littered around the parking and public areas of a US base in the Middle East. Someone picked one up, and when they put the drive in a laptop connected to SIPRNet, the Russians were inside. By the time Plunkett and her team made their discovery, the bug had spread to all of US Central Command and beyond and begun scooping up data, copying it, and sending it back to the Russians.
