Well, you want to protect yourself again a virus that's not recognised by anti-virus software !
htmm... interesting.

If you are curious (and daring) enough, you may try to reverse engineer the virus, see what it does; and then try to create your own anti-virus solution to it.
But I can assure you ... it won't be easy at all. It is difficult, rather painful (you'll know if you try ). And playing with a virus can be dangerous to your system's health.

If you just want to get a feel of what malware reversing is all about, here is a blog by Zairon (a moderator of www.crackmes.de and a really really good reverser) : http://zairon.wordpress.com/.