Not MSBlast ???

[fireguy]

Two days ago my non-firewalled XP system began doing the RPC shutdown thing that seems to indicate the msblast.exe worm. But it's not there! And Avast cleaner didn't find anything. Now I have a firewall (and the ms patch), and I no longer have shutdowns. But I don't know if I'm infected with something, or if the shutdowns were due to outside attacks. My firewall's been showing a lot of attempts to access port 135 from the outside world. Anyone with similar problems?

[Vlk]

Yes, it's possible.
Lots of this stuff is now circulating on the Internet, and unless your OS is patched and/or you have a firewall, you're alwaying risking remote attacks.

But note that this is not a virus. avast can't pick it up before the infected files appear on your machine, which is probably not the case here...

Vlk