| Threat Alias | Number of Incidents |
| Email-Worm.Win32.Agent.bx [Kaspersky Lab] | 721 |
| Trojan.Pandex [Symantec] | 672 |
| Spy-Agent.bv [McAfee] | 662 |
| Win32/Agent.worm.62464 [AhnLab] | 621 |
| Email-Worm.Win32.Agent.bx [Ikarus] | 457 |
| I-Worm.Wigon.Gen [PC Tools] | 455 |
| Spammer:Win32/Talwadig.A [Microsoft] | 318 |
| Spammer:Win32/Cutwail.gen!B [Microsoft] | 247 |
| Backdoor.Trojan [Symantec] | 72 |
| Trojan Horse [Symantec] | 66 |
| Trojan.Adclicker [Symantec] | 65 |
| Worm.Win32.AutoRun.aing [Kaspersky Lab] | 64 |
| Trojan-Downloader.Win32.Delf [Ikarus] | 61 |
| PWS:Win32/Cimuz.D [Microsoft] | 50 |
| Backdoor.Win32.Bandok [Ikarus] | 49 |
| BackDoor-CSN [McAfee] | 49 |
| Backdoor.Win32.Bandok.av [Kaspersky Lab] | 48 |
| W32/Autorun.worm!n [McAfee] | 48 |
| Backdoor:Win32/Bandok [Microsoft] | 45 |
| Backdoor.Bandok [PC Tools] | 44 |
| Worm.Win32.AutoRun [Ikarus] | 44 |
| New Malware.aj [McAfee] | 42 |
| Dropper/Downloader.99449 [AhnLab] | 40 |
| BackDoor-AWQ.svr.gen.a [McAfee] | 38 |
| Virus.Win32.OnLineGames.AHK [Ikarus] | 37 |
| Packed/Upack [AhnLab] | 36 |
| Downloader [Symantec] | 35 |
| Infostealer [Symantec] | 34 |
| Suspicious.MH690 [Symantec] | 34 |
| Backdoor.Graybird [Symantec] | 32 |
| Trojan.Adclicker!sd6 [PC Tools] | 32 |
| Generic.dx [McAfee] | 30 |
| W32.Fiala.A [Symantec] | 28 |
| Trojan:Win32/Ositki.A [Microsoft] | 24 |
| Generic PWS.y [McAfee] | 22 |
| Trojan-Dropper.Delf [Ikarus] | 22 |
| PWS:Win32/Ldpinch.gen [Microsoft] | 21 |
| Malware.Fiala [PC Tools] | 19 |
| BKDR_BANDOK.AU [Trend Micro] | 18 |
| Trojan.ATRAPS [Ikarus] | 18 |
| Tcad-Crypted [McAfee] | 17 |
| Trojan.Win32.FakeVimes [Ikarus] | 17 |
| PWS-LDPinch [McAfee] | 16 |
| Mal/WaledPak-D, Mal/Basine-C [Sophos] | 15 |
| not-a-virus:FraudTool.Win32.Agent.aed [Kaspersky Lab] | 15 |
| TrojanDownloader:Win32/Chksyn.gen!A [Microsoft] | 15 |
| Backdoor.Win32.Kbot.aq [Ikarus] | 14 |
| Trojan.DR.Dirat.Gen [PC Tools] | 14 |
| Trojan.KillAV [Symantec] | 14 |
| Trojan-PWS.Win32.LdPinch [Ikarus] | 14 |
| Downloader.gen.a [McAfee] | 13 |
| Trojan-PWS.LDPinch.1417 [Ikarus] | 13 |
| VirusDoctor [Symantec] | 13 |
| Worm.Win32.SillyShareCopy [Ikarus] | 13 |
| Backdoor:Win32/Phdet.gen!A [Microsoft] | 12 |
| Trojan.Win32.Ositki [Ikarus] | 12 |
| Trojan-Downloader.Win32.Mutant.avx [Kaspersky Lab] | 12 |
| Trojan-Dropper.Win32.Agent.arr [Kaspersky Lab] | 12 |
| TSPY_PROAGENT.BK [Trend Micro] | 12 |
| W32/Autorun.worm.gen [McAfee] | 12 |
| HeurEngine.MaliciousPacker [PC Tools] | 11 |
| Trojan.Progent [Symantec] | 11 |
| Trojan-Downloader.Win32.Small [Ikarus] | 11 |
| W32.Whacker.A [Symantec] | 11 |
| Packed.Generic.264 [Symantec] | 10 |
| TROJ_VIRANTIX.AJ [Trend Micro] | 10 |
| Trojan.KillAV [PC Tools] | 10 |
| Backdoor.IRCBot.WZO [PC Tools] | 9 |
| Backdoor.Win32.IRCBot.bib [Kaspersky Lab] | 9 |
| Backdoor:Win32/Sdbot [Microsoft] | 9 |
| BehavesLikeWin32.ExplorerHijack [Ikarus] | 9 |
| Infostealer.Ldpinch [Symantec] | 9 |
| Trojan.Win32.Agent [Ikarus] | 9 |
| Trojan-Downloader.Win32.Agent.azg [Kaspersky Lab] | 9 |
| Trojan-Downloader.Win32.Banload [Ikarus] | 9 |
| Trojan-Spy.Win32.ProAgent.P [Ikarus] | 9 |
| W32/Sdbot.worm [McAfee] | 9 |
| Win-Trojan/Agent.98304.S [AhnLab] | 9 |
| Backdoor:Win32/Poisonivy.E [Microsoft] | 8 |
| W32.SillyDC [Symantec] | 8 |
| Generic BackDoor [McAfee] | 7 |
| Worm.AutoRun.GEN [PC Tools] | 7 |
| BKDR_NUCLEAR.AZ [Trend Micro] | 6 |
| Downloader.Trojan [Symantec] | 6 |
| Dropper/Agent.329878 [AhnLab] | 6 |
| FakeAlert-EA [McAfee] | 6 |
| Generic Downloader.x [McAfee] | 6 |
| Generic Dropper.bu [McAfee] | 6 |
| MalwareScope.Trojan-PWS.Pinch.1 [Ikarus] | 6 |
| Packed.Win32.Krap.ah [Kaspersky Lab] | 6 |
| Trojan.Crypt [Ikarus] | 6 |
| Trojan.Delfinject.Gen.3 [PC Tools] | 6 |
| Trojan.Fakeavalert [Symantec] | 6 |
| Trojan.Midgare.EYZ [PC Tools] | 6 |
| TrojanDownloader:Win32/Small [Microsoft] | 6 |
| TrojanSpy.DR.ProAgent.AA.Gen [PC Tools] | 6 |
| VirTool.Win32.DelfInject [Ikarus] | 6 |
| Win-Trojan/Cosne.606218 [AhnLab] | 6 |
| Win-Trojan/Horse.35048 [AhnLab] | 6 |
| Backdoor.Win32.Hupigon.mmt [Kaspersky Lab] | 5 |