DavidR
6
If you happen to be on-line when you discover a virus, get off-line. If it happens to be a backdoor trogan/worm, etc. it will probably be trying to get connected to the internet.
Do a search for Win95:Matyas or Matyas in these forums, as I think that this will have been covered previously.
There are lots of them and they can also be found under fasce positive.
See this one of the many threads about it.
http://forum.avast.com/index.php?board=4;action=display;threadid=4769;start=msg34435#msg34435
It would appear that they are unencrypted virus pattern files from an on-line virus scanner.
David