NetMetro is a remote administration tool (RAT). As such, it is particularly dangerous giving complete access of your computer to the attacker. Once a computer is infected, the attacker can do anything they want on your computer via LAN or the Internet. The attacker has access to your personal information, passwords, files and anything else you keep on your computer. They can even install programs on your computer without your knowledge or consent.
NetMetro is at an elevated security risk because it does not give sufficient notice before changing or installing components on the computer.