7 Most Catastrophic Computer Viruses of All Time

5. Code Red

Estimated Damage: $2 billion

Code Red, named after what its discoverers were drinking at the time of their discovery, was a virus which targeted computers running a specific service. Once infected, they would display a message saying “Welcome to www.worm.com / Hacked by Chinese!” in their web browsers and after two weeks, all infected computers were programmed to launch a DDoS attack on major websites.

Most Catastrophic Computer Viruses of All Time - Code red