Even if I've learned that NOD32 adds to its database only worms and all ITW viruses, I think they should add also other viruses submitted by users. (I think it's not so hard and NOD detection rates may improve and perhaps the heuristic engine as well.) Recently I've submitted to ESET a very dangerous Trojan (it deletes your entire HDD in couple of mintes) but after 2 weeks it's still not detected. KAV, Fortinet and even AntiVir detect it. (I've scanned the file on Jotti's malware scan). Thank u for the replies.