What is the most costly computer system virus in history?

The most costly bug in history is the Love Bug infection, which was released in 2000. This virus triggered an estimated $5.5 billion in damage worldwide, making it the most pricey virus ever.  Discover More Here The Love Bug virus was a mass-mailing worm that infected over 45 million computers in just a couple of days. The virus spread quickly by emailing itself to everybody in the victim's address book. When a computer system was infected, the infection would erase essential files and spread itself to other computers. The Love Bug infection was eventually come by a team of antivirus scientists who created a vaccine that could protect computers from the infection.