"The "ILOVEYOU" virus, distributed via email and file sharing, affected 500,000+ systems and caused $15B in damages total, with $5.5B in damages being caused in the first week," according to Dong's site.
The "ILOVEYOU" virus was designed to replace media files on a computer, like photos and videos, with copies of the bug itself. It would then spread itself by emailing contacts in a user's Outlook account.
The virus overloaded email system around the world, and a "huge chunk of the businesses and governments to fully grind down to a halt," said Philip Menke, a consultant at Intel Security who spoke with Vice.