What is the most costly virus in history?

The most expensive trojan horse in history is the Love Bug virus, which was released in 2000. This virus caused an approximated $5.5 billion in damage worldwide, making it the most pricey infection ever. The Love Bug infection was a mass-mailing worm that infected over 45 million computers in just a few days. The virus spread quickly by emailing itself to everyone in the victim's address book. When a computer system was contaminated, the infection would erase crucial files and spread types of computer viruses itself to other computer systems. The Love Bug infection was ultimately dropped in a group of anti-virus scientists who developed a vaccine that might secure computer systems from the infection.