| Threat Alias | Number of Incidents |
| W32.Virut.CF [Symantec] | 278 |
| W32/Scribble-B [Sophos] | 208 |
| Virus.Win32.Virut.ce [Kaspersky Lab] | 193 |
| Virus:Win32/Virut.BM [Microsoft] | 182 |
| W32/Virut.n.gen [McAfee] | 173 |
| Trojan-Downloader.Win32.Cutwail [Ikarus] | 122 |
| Win32/Virut.E [AhnLab] | 117 |
| W32/Virut.gen [McAfee] | 81 |
| Virus:Win32/Virut.gen!O [Microsoft] | 77 |
| W32/Vetor-A [Sophos] | 75 |
| TrojanDownloader:Win32/Cutwail.gen!C [Microsoft] | 69 |
| Win32/Virut.F [AhnLab] | 68 |
| W32.Virut.U [Symantec] | 55 |
| Win32.Virut.Gen.5 [PC Tools] | 55 |
| W32/Scribble-A [Sophos] | 50 |
| W32/Virut-Gen [Sophos] | 49 |
| W32/Virut.j [McAfee] | 46 |
| Virus.Win32.Virut.q [Kaspersky Lab] | 45 |
| Trojan Horse [Symantec] | 43 |
| W32.Virut.W [Symantec] | 43 |
| Backdoor.Win32.Small.uc [Kaspersky Lab] | 42 |
| Spy-Agent.bv.gen.b [McAfee] | 42 |
| New Win32 [McAfee] | 41 |
| Mal/EncPk-HJ [Sophos] | 40 |
| Virus.Win32.Virut.n [Kaspersky Lab] | 38 |
| PE_VIRUT.AP [Trend Micro] | 32 |
| Virus:Win32/Virut.BI [Microsoft] | 32 |
| W32/Virut.n [McAfee] | 30 |
| Win32.Virut.Gen [PC Tools] | 30 |
| Mal/Generic-A [Sophos] | 28 |
| Trojan-Dropper.Win32.Cutwail [Ikarus] | 28 |
| Virus.Win32.Virut [Ikarus] | 28 |
| Mal/FakeAV-AX [Sophos] | 26 |
| W32.Virut.B [Symantec] | 26 |
| Trojan-Downloader.Win32.Small [Ikarus] | 24 |
| Virus:Win32/Virut.AK [Microsoft] | 24 |
| Win32/Virut.D [AhnLab] | 24 |
| PE_VIRUT.D [Trend Micro] | 22 |
| TrojanDownloader:Win32/Cutwail.gen!B [Microsoft] | 22 |
| W32.Sality.AE [Symantec] | 22 |
| PE_VIRUT.XO [Trend Micro] | 21 |
| TrojanDropper:Win32/Cutwail.AL [Microsoft] | 20 |
| Virus.Win32.Cheburgen.a [Ikarus] | 20 |
| Virus:Win32/Sality.AM [Microsoft] | 20 |
| Generic Downloader.x [McAfee] | 19 |
| PE_VIRUT.XP [Trend Micro] | 18 |
| Virus.Win32.Sality [Ikarus] | 18 |
| Virus.Win32.Sality.aa [Kaspersky Lab] | 18 |
| W32/Sality.gen [McAfee] | 18 |
| Trojan-Downloader.Win32.VB.bbi [Ikarus] | 17 |
| Backdoor.Trojan [Symantec] | 16 |
| Backdoor.Win32.Small.uh [Kaspersky Lab] | 16 |
| New Win32.g4 [McAfee] | 16 |
| W32/Sality-AM [Sophos] | 16 |
| Virus.Win32.Virut.bw [Kaspersky Lab] | 15 |
| Virus:Win32/Virut.AP [Microsoft] | 15 |
| Backdoor.Win32.Small.tv [Kaspersky Lab] | 14 |
| Cutwail [McAfee] | 14 |
| Virus:Win32/Virut.AE [Microsoft] | 14 |
| Win32/Kashu.B [AhnLab] | 14 |
| Win32/ReaBot.worm.60929 [AhnLab] | 14 |
| Win-Trojan/Agent.35328.KG [AhnLab] | 14 |
| Trojan.Kobcka [Ikarus] | 13 |
| Win32.Virut.U [Ikarus] | 13 |
| Infostealer.Gampass [Symantec] | 12 |
| Mal/EncPk-HJ, W32/Scribble-B [Sophos] | 12 |
| PE_VIRUT.XL [Trend Micro] | 12 |
| PE_VIRUX.A-1 [Trend Micro] | 12 |
| Trojan.Win32.Agent2.hck [Kaspersky Lab] | 12 |
| Trojan-Downloader.Win32.FraudLoad.vmrj [Kaspersky Lab] | 12 |
| Trojan-Spy.Gampass!sd6 [PC Tools] | 12 |
| Virus:Win32/Virut.K [Microsoft] | 12 |
| Win-Trojan/Kobcka.30208.D [AhnLab] | 12 |
| Mal/Pushdo-A [Sophos] | 11 |
| Virus.Win32.Virut.bu [Kaspersky Lab] | 11 |
| Backdoor.Win32.Small.yt [Kaspersky Lab] | 10 |
| Trojan.Win32.Agent.cdcn [Kaspersky Lab] | 10 |
| Win32/Virut.Gen [AhnLab] | 10 |
| Win-Trojan/SpamMailer.24576 [AhnLab] | 10 |
| Win-Trojan/Downloader.35328.JD [AhnLab] | 9 |
| Backdoor.Win32.Small.hnz [Kaspersky Lab] | 8 |
| Generic Downloader.x!bg [McAfee] | 8 |
| Generic Downloader.x!bia [McAfee] | 8 |
| PE_VIRUT.BA [Trend Micro] | 8 |
| Troj/Pushu-Gen, Mal/Behav-116, Mal/Emogen-Y [Sophos] | 8 |
| Trojan.Pandex [Symantec] | 8 |
| Virus.Win32.Virut.bx [Kaspersky Lab] | 8 |
| Virus.Win32.Virut.q [Ikarus] | 8 |
| Virus:Win32/Virut.AU [Microsoft] | 8 |
| Mal/FakeAV-AX, W32/Scribble-B [Sophos] | 7 |
| Backdoor.Small!sd6 [PC Tools] | 6 |
| Backdoor.Win32.Small.ibb [Kaspersky Lab] | 6 |
| Generic.dx [McAfee] | 6 |
| PE_SALITY.EN [Trend Micro] | 6 |
| Trojan-Dropper.Win32.Agent.afvt [Kaspersky Lab] | 6 |
| Virus.W32.Sality [Ikarus] | 6 |
| Virus.Win32.Virut.au [Ikarus] | 6 |
| Virus.Win32.Virut.bv [Kaspersky Lab] | 6 |
| Virus:Win32/Virut.gen!E [Microsoft] | 6 |
| Virus:Win32/Virut.L [Microsoft] | 6 |