WannaCry was the very first ransomware to take the whole world by storm, infecting several hundred thousand people in a single day. Some reports say the damage could be up to $4 billion. Luckilym a security researcher in England managed to discover a kill switch domain, which was all anyone needed to disable it. Further analysis shows that the kill switch domain has received over 10 million different connections since it was made available, suggesting WannaCry could have been even more destructive. Destruction Zone: 150+ countries
