Dosh

Originated in February 2005. A Remote Administration Tool is a special
kind of hacker malware, used for remote access and control of other
people's PCs. 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, remove files and even crash your computer. The
infection peaked in the United States.