| Threat Alias | Number of Incidents |
| W32/Virut.gen [McAfee] | 716 |
| Virus.Win32.Virut.n [Kaspersky Lab] | 663 |
| Win32.Virut.Gen [PC Tools] | 596 |
| Virus:Win32/Virut.AK [Microsoft] | 586 |
| W32.Virut.B [Symantec] | 571 |
| W32/Vetor-A [Sophos] | 372 |
| W32/Virut-L [Sophos] | 225 |
| Virus.Win32.Cheburgen.a [Ikarus] | 155 |
| Win32/Virut.D [AhnLab] | 146 |
| Win32/Virut.C [AhnLab] | 76 |
| Virus.Win32.Virut.d [Kaspersky Lab] | 62 |
| Virus.Virut.na [PC Tools] | 52 |
| Virus.Win32.Virut.q [Kaspersky Lab] | 33 |
| W32.Spybot.Worm [Symantec] | 26 |
| Virus.Win32.Cheburgen [Ikarus] | 25 |
| W32/Nachi.worm.a [McAfee] | 23 |
| Worm.Win32.Nachi [PC Tools] | 23 |
| Virus.Win32.Virut.n [Ikarus] | 19 |
| Virus.Win32.Virut [Ikarus] | 18 |
| Virus.Win32.Virut.q [Ikarus] | 17 |
| W32.IRCBot [Symantec] | 15 |
| Trojan Horse [Symantec] | 11 |
| W32.Linkbot.M [Symantec] | 9 |
| Virus.Win32.Virut.bo [Ikarus] | 8 |
| Backdoor.Trojan [Symantec] | 7 |
| Generic FakeAlert.d [McAfee] | 7 |
| Mal/Dorf-A, W32/Vetor-A [Sophos] | 7 |
| Win32.Virtob.2 [Ikarus] | 7 |
| Backdoor.Win32.Rbot [Ikarus] | 6 |
| Net-Worm.Win32.Allaple.a [Ikarus] | 6 |
| VirTool.Win32.DelfInject [Ikarus] | 6 |
| Virus.Win32.Sality [Ikarus] | 6 |
| Backdoor:Win32/Poebot.BA [Microsoft] | 5 |
| FakeAlert-AG.gen.c [McAfee] | 5 |
| Virus.Win32.Virtob [Ikarus] | 5 |
| Win32/IRCBot.worm.variant [AhnLab] | 5 |
| Worm.Rbot.MCH [PC Tools] | 5 |
| Backdoor.Mytobor.W [PC Tools] | 4 |
| Backdoor.Small.VZJ [PC Tools] | 4 |
| Backdoor:Win32/Poebot.BG [Microsoft] | 4 |
| Backdoor:Win32/Rbot.HB [Microsoft] | 4 |
| Downloader-BPL [McAfee] | 4 |
| Generic.Sdbot [Ikarus] | 4 |
| Net-Worm.Win32.Allaple [Ikarus] | 4 |
| Trojan-Dropper.Agent [Ikarus] | 4 |
| Trojan-Dropper.Kobcka [Ikarus] | 4 |
| Virus.Win32.Virut.a [Ikarus] | 4 |
| Virus:Win32/Virut.C [Microsoft] | 4 |
| Win32.SuspectCrc [Ikarus] | 4 |
| Worm.Poebot.AS [PC Tools] | 4 |
| Worm.RBot.DBI [PC Tools] | 4 |
| Worm.SdBot.GAP [PC Tools] | 4 |
| Backdoor.DsBot.AM [PC Tools] | 3 |
| Backdoor.Sdbot [Symantec] | 3 |
| Backdoor.VanBot.IK [PC Tools] | 3 |
| Backdoor.Win32.IRCBot [Ikarus] | 3 |
| Backdoor:Win32/Poebot.AT [Microsoft] | 3 |
| Downloader [Symantec] | 3 |
| Trojan.Win32.Banker [Ikarus] | 3 |
| Trojan.Win32.VB [Ikarus] | 3 |
| Trojan-Dropper.Win32.Cutwail.AL [Ikarus] | 3 |
| Trojan-Proxy.Win32.Slaper.n [Kaspersky Lab] | 3 |
| Trojan-Spy.Win32.Banker.RM [Ikarus] | 3 |
| Virus.Win32.Virut.au [Ikarus] | 3 |
| W32/Sdbot.worm.gen.q [McAfee] | 3 |
| Win32.Cadoiac.A [Ikarus] | 3 |
| Win32.Virtob [Ikarus] | 3 |
| Worm.PoeBot.P [PC Tools] | 3 |
| Worm:Win32/Kulsibot.A [Microsoft] | 3 |
| Backdoor.Nepoe.M [PC Tools] | 2 |
| Backdoor.Rbot [Ikarus] | 2 |
| Backdoor.VanBot.JW [PC Tools] | 2 |
| Backdoor.Win32.Nepoe [Ikarus] | 2 |
| Backdoor.Win32.Nepoe.em [Kaspersky Lab] | 2 |
| Backdoor.Win32.VanBot.cx [Kaspersky Lab] | 2 |
| Backdoor:Win32/Poebot.BP [Microsoft] | 2 |
| Backdoor:Win32/Rbot [Microsoft] | 2 |
| Generic PWS.ak [McAfee] | 2 |
| Generic VB.c [McAfee] | 2 |
| Mal/Behav-066, Mal/Behav-164, Mal/TibsPak [Sophos] | 2 |
| Mal/HckPk-A, W32/Vetor-A [Sophos] | 2 |
| Mal/TibsPak, W32/Vetor-A [Sophos] | 2 |
| Net-Worm.Win32.Kolabc [Ikarus] | 2 |
| Net-Worm.Win32.Welchia.s [Kaspersky Lab] | 2 |
| Spammer [Ikarus] | 2 |
| Trojan.VB.EHF [PC Tools] | 2 |
| Trojan.Win32.Delf.bgp [Kaspersky Lab] | 2 |
| Trojan.Win32.Pakes [Ikarus] | 2 |
| Trojan-Banker.Win32.Bancos [Ikarus] | 2 |
| Trojan-Clicker.Win32.Klik [Ikarus] | 2 |
| Trojan-Downloader.Win32.Genome.abou [Kaspersky Lab] | 2 |
| Trojan-Downloader.Win32.Suurch.oa [Kaspersky Lab] | 2 |
| Trojan-Dropper.Win32.Vaultac [Ikarus] | 2 |
| VirTool.Win32.Injector.D [Ikarus] | 2 |
| Virus.Win32.Agent.GZY [Ikarus] | 2 |
| Virus.Win32.Rootkit [Ikarus] | 2 |
| Virus.Win32.Virut.ak [Ikarus] | 2 |
| W32.SillyFDC [Symantec] | 2 |
| W32/Vetor-D [Sophos] | 2 |
| Win32.Expiro.B [PC Tools] | 2 |