system
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Unfortunately, the Avast team are WAY too lazy to assign the proper names to each detected virus/trojan
So if you want to find whether your file is indeed infected by a virus/trojan, and especially the correct name for it, try the free online scanners, good ones are
http://avp.ru/remoteviruschk.html
and
http://www.ravantivirus.com/scan/indexie.php