It is a trojan backdoor virus. It allows an outside user to access your computer and run programs on it. The reason it is not detected by some anti-virus programs is because it is small, simple, and not very active on a system. Hence, it only shows up on a deep scan. It is possible that it is used to access account information for online games, but I am not sure about that at this point; I do know that the virus is specifically infecting hack/bot tools for MMORPGs.