| Threat Alias | Number of Incidents |
| W32.Virut.CF [Symantec] | 2,830 |
| Virus.Win32.Virut.ce [Kaspersky Lab] | 2,718 |
| W32/Scribble-B [Sophos] | 2,324 |
| Win32/Virut.F [AhnLab] | 1,841 |
| W32/Virut.n.gen [McAfee] | 1,612 |
| Win32/Virut.E [AhnLab] | 639 |
| Malware.Virut [PC Tools] | 410 |
| New Win32 [McAfee] | 331 |
| W32/Virut.n [McAfee] | 311 |
| W32/Scribble-A [Sophos] | 297 |
| New Win32.g4 [McAfee] | 120 |
| Virus.Win32.Sality [Ikarus] | 115 |
| PE_VIRUX.H-3 [Trend Micro] | 109 |
| Virus.Win32.Virut [Ikarus] | 107 |
| Mal/HckPk-A, W32/Scribble-B [Sophos] | 77 |
| New Poly Win32 [McAfee] | 69 |
| Virus.Win32.Bifrose [Ikarus] | 54 |
| PE_VIRUX.E-2 [Trend Micro] | 46 |
| PE_VIRUX.A-1 [Trend Micro] | 44 |
| Mal/Bifrose-S, W32/Scribble-B [Sophos] | 40 |
| Virus.Win32.Virut.bo [Ikarus] | 36 |
| PE_VIRUX.A [Trend Micro] | 34 |
| PE_VIRUX.E-3 [Trend Micro] | 34 |
| Trojan-Downloader.Win32.Agent.czsd [Kaspersky Lab] | 32 |
| Trojan-Banker.Win32.Bancos [Ikarus] | 31 |
| Spam-Mailbot [McAfee] | 29 |
| BackDoor-CEP.gen.au [McAfee] | 24 |
| Backdoor.Rbot [Ikarus] | 22 |
| W32/Sdbot.worm.gen.g [McAfee] | 22 |
| WORM_RBOT.GEN-1 [Trend Micro] | 22 |
| Virus.Virut.j [PC Tools] | 21 |
| W32/Rbot-Fam, W32/Scribble-B [Sophos] | 21 |
| Worm.Akbot.Gen [PC Tools] | 21 |
| not-a-virus:Porn-Dialer.Win32.Agent.bk [Ikarus] | 19 |
| Trojan.Win32.Banker [Ikarus] | 19 |
| Trojan-Downloader.Win32.Cutwail [Ikarus] | 18 |
| Backdoor.Win32.Popwin [Ikarus] | 17 |
| Trojan Horse [Symantec] | 17 |
| Trojan-Spy.Win32.Banker.RM [Ikarus] | 17 |
| Virus.Win32.Virut.q [Ikarus] | 17 |
| W32.Virut [Ikarus] | 17 |
| Email-Worm.Win32.Mydoom.bj [Ikarus] | 16 |
| PE_VIRUX.F-3 [Trend Micro] | 16 |
| Trojan.Agent.DEL [PC Tools] | 16 |
| W32.Mytob@mm [Symantec] | 16 |
| Packed.Win32.Koblu [Ikarus] | 15 |
| PE_VIRUX.F-2 [Trend Micro] | 15 |
| Exploit.Win32.IMG-WMF [Ikarus] | 14 |
| Backdoor.Win32.Beastdoor [Ikarus] | 13 |
| Backdoor.Win32.Bifrose [Ikarus] | 13 |
| Mal/FakeVirPk-A, W32/Scribble-B [Sophos] | 13 |
| New Win32.g2 [McAfee] | 12 |
| Spammer [Ikarus] | 11 |
| Trojan-Downloader.Win32.Banload [Ikarus] | 11 |
| VirTool.Win32.DelfInject [Ikarus] | 11 |
| Trojan-Dropper.Agent [Ikarus] | 10 |
| BackDoor-CEP.gen.g [McAfee] | 9 |
| Mal/Bifrose-S, Mal/Bifrose-S, W32/Scribble-B [Sophos] | 9 |
| PWS-Banker [McAfee] | 9 |
| Spam-Mailbot.h.gen.a [McAfee] | 9 |
| Virus.Win32.Virtob [Ikarus] | 9 |
| Win-Trojan/Midgare.32256 [AhnLab] | 9 |
| Backdoor.Win32.Refpron [Ikarus] | 8 |
| BackDoor-CEP.svr [McAfee] | 8 |
| BKDR_BIFROSE.MIC [Trend Micro] | 8 |
| New Win32.g3 [McAfee] | 8 |
| PE_VIRUX.D-1 [Trend Micro] | 8 |
| PE_VIRUX.E-4 [Trend Micro] | 8 |
| PE_VIRUX.J-4 [Trend Micro] | 8 |
| Spy-Agent.bv.gen.b [McAfee] | 8 |
| Trojan.Win32.Agent.bcn [Kaspersky Lab] | 8 |
| Trojan.Win32.Patched [Ikarus] | 8 |
| Trojan.Win32.VB [Ikarus] | 8 |
| Trojan-Clicker.Win32.Delf [Ikarus] | 8 |
| W32.SillyFDC [Symantec] | 8 |
| Backdoor.Bifrose.AHY [PC Tools] | 7 |
| BKDR_AHZE.NY [Trend Micro] | 7 |
| Downloader [Symantec] | 7 |
| Mal/Behav-043, W32/Scribble-B [Sophos] | 7 |
| Mal/HckPk-A [Sophos] | 7 |
| Packed.Win32.Katusha.c [Kaspersky Lab] | 7 |
| Packed.Win32.Krap.b [Kaspersky Lab] | 7 |
| Trojan.Midgare.hhn [PC Tools] | 7 |
| Trojan-Downloader.Win32.Small [Ikarus] | 7 |
| Virus.Trojan.Win32.Midgare [Ikarus] | 7 |
| Win32.Cadoiac.A [Ikarus] | 7 |
| Backdoor.Win32.Small.uc [Kaspersky Lab] | 6 |
| Generic PWS.ak [McAfee] | 6 |
| Trojan.Adclicker [Symantec] | 6 |
| Trojan-Clicker.Win32.VB [Ikarus] | 6 |
| Trojan-Dropper [Ikarus] | 6 |
| Trojan-Spy.Win32.VB [Ikarus] | 6 |
| Virus.W32.Sality [Ikarus] | 6 |
| Virus.Win32.Virut.n [Ikarus] | 6 |
| Win32.Virtob.2 [Ikarus] | 6 |
| Win-Trojan/Bifrose.29053 [AhnLab] | 6 |
| Win-Trojan/Xema.variant [AhnLab] | 6 |
| Backdoor.Win32.Agent.adql [Kaspersky Lab] | 5 |
| Backdoor.Win32.Bifrose.fpb [Kaspersky Lab] | 5 |
| Cutwail [McAfee] | 5 |