The Kas Valley Virus is a rather interesting phenomenon of modern technology. According to scientific research, the virus is becoming the worst competitor of the Butthurt Valley virus and the Kakichmoki Valley virus. It was discovered at the end of the last century in the American state of Colorado. A few years later, it was determined that it was based on the Mello virus, the original source of all computer viruses. By the time it was discovered, it was widely distributed throughout the world and posed a serious danger. In addition, it is still actively used in different countries of the world to send spam. The main methods of infection using this virus are: copying files from the user’s computer using Kasha Valley viruses.