What is the most expensive trojan horse in history?

The most costly trojan horse in history is the Love Bug infection, which was launched in 2000. This virus caused an estimated $5.5 billion in damage worldwide, making it the most pricey infection ever. The Love Bug virus was a mass-mailing worm that contaminated over 45 million computer systems in simply a couple of days. The infection spread rapidly by emailing itself to everybody in the victim's address book.  https://showdaily.biz/?p=618 When a computer system was infected, the infection would delete essential files and spread itself to other computer systems. The Love Bug infection was ultimately dropped in a team of anti-virus scientists who produced a vaccine that might secure computer systems from the virus.