Next Monday, a virus file named "QQ pass variant YVR" will bring troubles to users. Rising global anti-virus Monitoring Network issued an alert that the virus will be written into the root directory of the USB flash drive and spread through the USB flash drive. Double-click the drive letter to be infected, and then run it in the background to steal the QQ password. Rising anti-virus experts pointed out that "QQ pass variant YVR" is a trojan virus. It searches users' QQ installation locations and steals passwords by detecting QQ running conditions. After the virus runs, a hidden virus file is created under the root directory of the USB flash drive and mobile hard drive, and then waits for the user's operation. Once you double-click the drive letter, virus can automatically run and infect other computers. Because the virus is transmitted through a USB flash drive, it is fast and difficult to be detected.