In October Warezov.cc accounted for over 13% of all viruses detected, which is an unprecedented achievement. Trojan-Downloader.Win32.Delfawg has been dethroned, but traces of the September 6th outbreak can still be seen in the rankings. The top half of the chart reflects all the problems faced by todays Internet users: email worms, Trojan downloaders, keyloggers, backdoors and something which we have rarely mentioned before, IM-Flooders.”]
Source: https://securelist.com/online-scanner-top-twenty-for-october-2006/36114/