World's Deadliest Computer Virus: WannaCry
On May 12, 2017, a malware called WannaCry spread uncontrollably through 150 countries, affecting nearly every continent worldwide.
Carlo's take
WannaCry demonstrated how vulnerable critical infrastructure is to ransomware. The attack succeeded primarily because organizations didn't patch known vulnerabilities. It's a brutal lesson: security isn't about sophisticated defenses—it's about basic hygiene like keeping systems updated.