This is a Remote Administration Tool that is used by hackers to control the victim’s machine remotely. The possibilities of such programs depend on the needs of the attacker. The attacker infects the PC via the e-mail or File and Print Sharing. A "server" allows him to connect via a "client" on his own machine. The functions of a RAT may vary, depending on the needs of the hacker. Some RATs can’t really harm your PC and the only purpose they were made for is hooliganism. But some versions can steal vital information, delete files and even crash your system. The author is a Chinese hacker called Yi Zhilai. Many versions of this dangerous pest originated from February 2004 to March 2004. This pest affects such operating systems as Microsoft Windows 95/98/NT4.