Massive outbreak of ransomware variant infects large amounts of computers around the world

On May 12, 2017 a global WannaCry ransomware campaign exploited the Windows SMB vulnerability (MS17-010/ETERNALBLUE) to self-propagate and encrypt files across internal networks; the report documents the large-scale impact, discovery of a hardcoded kill-switch domain that temporarily halted execution, Tor-based C2 onion addresses, Snort detection rules, recommended mitigations (apply MS17-010, disable SMBv1, isolate unpatched systems, verify backups), and other IoCs and behavioral details.