What is it?
It is a file created by the worm W32.Spybot.DAZ also known as Backdoor.Rbot.gen

What does it do?
W32.Spybot.DAZ is a worm that spreads through IRC, network shares and exploits, as well as computers that are infected with common backdoor Trojan horses.

Copies itself as:
%System%mvsc.exe

Removal Instructions
@symantec