What is the most pricey trojan horse in history?

The most expensive trojan horse in history is the Love Bug infection, which was launched in 2000. This infection triggered an estimated $5.5 billion in damage worldwide, making it the most expensive infection ever. The Love Bug virus was a mass-mailing worm that contaminated over 45 million computer systems in just a couple of days. The infection spread rapidly by emailing itself to everybody in the victim's address book. When a computer was contaminated, the infection would erase essential files and spread itself to other computers. The Love Bug infection was ultimately visited a team of anti-virus researchers who developed a vaccine that might safeguard computers from the infection. here