| Threat Alias | Number of Incidents |
| W32/Virut.gen [McAfee] | 137 |
| Virus.Win32.Virut.n [Kaspersky Lab] | 114 |
| Win32.Virut.Gen [PC Tools] | 102 |
| Bloodhound.Unknown [Symantec] | 40 |
| W32/Vetor-A [Sophos] | 29 |
| Virus:Win32/Virut.AH [Microsoft] | 26 |
| W32.Virut!gen [Symantec] | 23 |
| Virus.Win32.Virut.q [Kaspersky Lab] | 20 |
| W32.Rontokbro.U@mm [Symantec] | 14 |
| Worm.Brontok.BK [PC Tools] | 14 |
| W32.Spybot.Worm [Symantec] | 9 |
| W32.IRCBot [Symantec] | 6 |
| Trojan-Downloader.Win32.Small [Ikarus] | 3 |
| W32/Nachi.worm.a [McAfee] | 3 |
| Worm.SdBot.GAP [PC Tools] | 3 |
| Worm.Win32.Nachi [PC Tools] | 3 |
| Backdoor.Trojan [Symantec] | 2 |
| Worm.IRCBot.ATT [PC Tools] | 2 |
| Worm.Rbot.MCH [PC Tools] | 2 |
| Worm.RBot.USV [PC Tools] | 2 |
| Worm.RBot.UTA [PC Tools] | 2 |
| Backdoor.IRCBot.BFE [PC Tools] | 1 |
| Backdoor.IRCBot.BHH [PC Tools] | 1 |
| Backdoor.Sdbot [Symantec] | 1 |
| Backdoor.Win32.SdBot.xd [Kaspersky Lab] | 1 |
| Backdoor.Win32.VanBot.cx [Kaspersky Lab] | 1 |
| Backdoor:Win32/Poebot.AD [Microsoft] | 1 |
| Backdoor:Win32/Poebot.BA [Microsoft] | 1 |
| Backdoor:Win32/Poebot.BG [Microsoft] | 1 |
| BehavesLike.Trojan-Downloader [Ikarus] | 1 |
| Downloader [Symantec] | 1 |
| FakeAlert-AG.gen.c [McAfee] | 1 |
| I-Worm.Brontok.CE [PC Tools] | 1 |
| I-Worm.Brontok.CU [PC Tools] | 1 |
| I-Worm.Womble.B1 [PC Tools] | 1 |
| Net-Worm.Win32.Kolabc.bsb [Kaspersky Lab] | 1 |
| New Malware.gm [McAfee] | 1 |
| New Win32.g2 [McAfee] | 1 |
| Trojan.Buzus.E [PC Tools] | 1 |
| Trojan.Crypt [Ikarus] | 1 |
| Trojan-Downloader.Win32.Bagle.gk [Kaspersky Lab] | 1 |
| Trojan-Dropper.Kobcka [Ikarus] | 1 |
| Virus.Win32.Agent.aj [Ikarus] | 1 |
| Virus.Win32.Virut.n [Ikarus] | 1 |
| Virus.Worm.Win32.AutoRun.dht [Ikarus] | 1 |
| W32.Rinbot.V [Symantec] | 1 |
| W32.Rontokbro@mm [Symantec] | 1 |
| W32.Womble.A@mm [Symantec] | 1 |
| W32/Sdbot.worm.gen.q [McAfee] | 1 |
| Win32/Virut.C [AhnLab] | 1 |
| Win32/Virut.D [AhnLab] | 1 |
| Win-Trojan/Black.554496.B [AhnLab] | 1 |
| Worm.Allaple.AA [PC Tools] | 1 |
| Worm.Poebot.CY [PC Tools] | 1 |
| Worm.Poebot.IT [PC Tools] | 1 |
| Worm.PoeBot.NN [PC Tools] | 1 |
| Worm.RBot.AATC [PC Tools] | 1 |
| Worm.RBot.DBI [PC Tools] | 1 |
| Worm.RBot.OLC [PC Tools] | 1 |
| Worm.Rbot.UWN [PC Tools] | 1 |
| Worm.SdBot.CQI [PC Tools] | 1 |
| Worm.SdBot.ELD [PC Tools] | 1 |