UniExtract comes with a file called "IsXunpack.exe". For some reason Antivir reported a trojan in that file this morning. As this never happened before and Antivir is know to report false positives now and again, I sent the file to the makers of Antivir for analyses. I always do this in case of a positive and the usual reply is that it is not really a virus and it will be fixed in one the the next updates.

Not this time. This was their reply:
"Thank you for your recent inquiry.
In the attachment you have sent us we found the virus Trojan/Crypt.F.Gen. The current version of AntiVir already detects this virus.
Please note, that this is not a false positive.
We thank you for your assistance."


Well, the answer is very clear, but what is it all about?
Does anyone else get the same result with another AV?

I ran a scan on the file you mentioned with AVG (virus database 368.9.5/377) and found no such trojan. I dnwnloaded the UniExtract application some time ago, so if you recently downloaded it from their website it may be possible that it has a virus. Either that of your computer has recently caught a cold!

Or it is faking having a cold.
I just found this: http://www.msfn.org/board/index.php?sho ... 418&st=120

There seem to be many AVs reporting false positives with this program.
Two online scans with other scanners I just did were "clean", so in spite of what Antivir says, I still think that file is OK.

Well I did have AntiVir report a false positive once with a program called TimeCore Solo. However, in this instance the AntiVir team did confirm that this was a false positive rather than a truly infected file. The point is, it is more than possible, its happened to me.

Why don't you try an online scan to see what result you get. I would recommend HouseCall from TrendMicro.