World's biggest bank trades via USB stick after hack

The incident spotlights a danger that bank leaders concede keeps them up at night — the prospect of a cyberattack that could someday cripple a key piece of the financial system's wiring, setting off a cascade of disruptions. Even brief episodes prompt bank leaders and their government overseers to call for more vigilance. "This is a true shock to large banks around the world," said Marcus Murray, the founder of Swedish cybersecurity firm Truesec. "The ICBC hack will make large banks around the globe race to improve their defences, starting today." Ransomware attack As details of the attack emerged, employees…