UNHIT!!! STOP THAT!
Stop attacking, mr. Unhit!YEAH

Edit 1:

The virus uses programs.
1. The virus uses TSF Warper or Ultrawarp to make you to warp other positions.
2. Virus uses The Weird to change names.
3. The virus makes players invisible. You can do that with Stealth Kicker.
4. You get a black screen if you kick yourself with Stealth Kicker. Virus does that.

btw, how Eagle can know the virus comes with a warp program?