Exclusive: Chinese hackers behind U.S. ransomware attacks - security firms(Reuters) - Hackers using tactics and tools previously associated with Chinese government-supported computer network intrusions have joined the booming cyber crime industry of ransomware, four security firms that investigated attacks on U.S. companies said. The word 'password' is pictured on a computer screen in this picture illustration taken in Berlin May 21, 2013. REUTERS/Pawel Kopczynski Ranso
