Created in 2001, it infected around 7 million computers. The Klez virus cost almost $20 billion in damages. Instead, Conficker was used to spread “scareware,” or fake alerts that try to scare victims into downloading malware disguised as an antivirus program. Security experts were on edge waiting for Conficker to use its massive botnet to unleash a destructive attack - but it never came. Once it contaminated a computer, Conficker added the device to a botnet, or a group of computers infected with malware and remotely controlled by a hacker. Its most recent version, Conficker C, uses peer-to-peer networking to spread. Sobig.F was considered the worst.Īlso known as Downadup, the Conficker virus has infected millions of Windows computers since its creation in 2008. The virus was named Sobig because it released several variations of itself, named Sobig.A through Sobig.F, in quick succession. It affected multiple countries, including the U.S., Canada, and the U.K. The Sobig computer virus cost approximately $30 billion in 2003. Before some users knew they got infected by a virus, the worm had spread through their emails. That means it looks for security software vulnerabilities. Devices without solid antivirus protection still get infected and send more than 1 billion copies of the virus each year. The Mydoom virus is still around today and accounts for around 1% of all phishing emails. Then it sent copies of the virus to those addresses. It worked by scraping email addresses from infected machines. If you think in terms of today’s economy, given inflation, that would amount to about $52 billion. Here are seven of the nastiest computer viruses in history.Ĭonsidered by many to be the most dangerous computer virus in history, the Mydoom virus cost around $38 billion worth of damage in 2004. Learning about the worst computer viruses can show you some of the signs of viruses and how they operate. How to protect against new computer viruses In this article 11 most dangerous computer viruses
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