| Threat Alias | Number of Incidents |
| Hacktool.Rootkit [Symantec] | 661 |
| Mal/Generic-A [Sophos] | 516 |
| Rootkit.Win32.Agent [Ikarus] | 397 |
| Rootkit.Win32.Agent.adah [Kaspersky Lab] | 380 |
| Win-Trojan/Rootkit.59264 [AhnLab] | 380 |
| Generic.dx!lre [McAfee] | 323 |
| VirTool:WinNT/Koobface.G [Microsoft] | 266 |
| Mal/Rootkit-Q [Sophos] | 82 |
| Trojan.WinNT.Sirefef [Ikarus] | 80 |
| Backdoor:WinNT/Rustock.H [Microsoft] | 65 |
| Backdoor.WinNT.Rustock [Ikarus] | 64 |
| Troj/Agent-LUE [Sophos] | 60 |
| Trojan-Downloader [Ikarus] | 60 |
| Win-Trojan/Xema.variant [AhnLab] | 42 |
| Generic.dx!hmb [McAfee] | 40 |
| Rootkit.Win32.Agent.zuf [Kaspersky Lab] | 40 |
| Backdoor:Win32/Prosti.AG [Microsoft] | 39 |
| BackDoor-DUG.a [McAfee] | 39 |
| Troj/DwnLdr-HYE [Sophos] | 39 |
| TROJ_DLOADR.DIM [Trend Micro] | 39 |
| Trojan-Downloader.Win32.Delf.uvk [Kaspersky Lab] | 38 |
| Win-Trojan/Agent.2304.Q [AhnLab] | 36 |
| Trojan-Dropper [Ikarus] | 33 |
| Generic BackDoor!bfy [McAfee] | 30 |
| VirTool:WinNT/Rootkitdrv.GZ [Microsoft] | 28 |
| Trojan:WinNT/Sirefef.A [Microsoft] | 26 |
| Rootkit.Win32.Agent.ucy [Kaspersky Lab] | 20 |
| Rootkit.Win32.Agent.zzl [Kaspersky Lab] | 20 |
| Win-Trojan/Agent.30976.AH [AhnLab] | 20 |
| not-a-virus:PSWTool.Win32.Agent.ac [Kaspersky Lab] | 16 |
| Rootkit.Win32.Tiny [Ikarus] | 13 |
| Rootkit.Win32.Tiny.hp [Kaspersky Lab] | 13 |
| Trojan-Dropper.Agent [Ikarus] | 12 |
| Backdoor.Win32.Agent.ajyu [Kaspersky Lab] | 10 |
| Generic PWS.y!bfb [McAfee] | 10 |
| Otlard [McAfee] | 10 |
| Trojan:WinNT/Otlard.B [Microsoft] | 10 |
| Generic.dx!fwa [McAfee] | 9 |
| Rootkit.Win32.Agent.wrc [Kaspersky Lab] | 9 |
| Rootkit.Win32.Agent.zuo [Kaspersky Lab] | 9 |
| Backdoor:WinNT/Rustock.gen!B [Microsoft] | 6 |
| Trojan-Downloader.Win32.Geral.cnf [Kaspersky Lab] | 6 |
| Win-Trojan/Agent.30976.AI [AhnLab] | 6 |
| Downloader-BNM [McAfee] | 5 |
| Rootkit.Win32.Small.rc [Kaspersky Lab] | 5 |
| Troj/Perksh-Gen [Sophos] | 5 |
| TrojanDownloader:Win32/Perkesh.gen!A [Microsoft] | 5 |
| Win-Trojan/Downloader.8320.J [AhnLab] | 5 |
| Backdoor.Win32.Bifrose.bxif [Kaspersky Lab] | 4 |
| Backdoor:WinNT/Haxdoor.gen!A [Microsoft] | 4 |
| BackDoor-CCT.dll [McAfee] | 4 |
| Generic BackDoor!bou [McAfee] | 4 |
| Generic Downloader.x!bgo [McAfee] | 4 |
| not-a-virus:Monitor.Win32.ActualSpy.27 [Kaspersky Lab] | 4 |
| Troj/MDrop-CIQ [Sophos] | 4 |
| Trojan-Downloader.Win32.Geral [Ikarus] | 4 |
| TrojanDownloader:Win32/Troxen!rts [Microsoft] | 4 |
| Win-Trojan/Geral.6272.B [AhnLab] | 4 |
| BackDoor-BAC!c [McAfee] | 3 |
| Generic.dx!ndq [McAfee] | 3 |
| Mal/TDSSPack-G [Sophos] | 3 |
| Rkit [Ikarus] | 3 |
| Trojan.WinNT.Tibs [Ikarus] | 3 |
| Trojan:WinNT/Tibs.gen!A [Microsoft] | 3 |
| Virus.Win32.Protector [Ikarus] | 3 |
| Virus.Win32.Protector.c [Kaspersky Lab] | 3 |
| Virus:Win32/Cutwail.H [Microsoft] | 3 |
| Win32/IRCBot.worm.variant [AhnLab] | 3 |
| Win32/Ntfs [AhnLab] | 3 |
| Win-Trojan/Agent.153728.B [AhnLab] | 3 |
| FakeAlert-WinwebSecurity.a [McAfee] | 2 |
| Mal/FakeAV-AX, Mal/EncPk-MX, Mal/FakeAV-AE [Sophos] | 2 |
| Mal/Nupylos-A [Sophos] | 2 |
| Mal/Packer [Sophos] | 2 |
| PWS:Win32/Zbot.A [Microsoft] | 2 |
| Rootkit.Win32.Agent.aejh [Kaspersky Lab] | 2 |
| Rootkit.Win32.Agent.upn [Kaspersky Lab] | 2 |
| Trojan.Rootkit [Ikarus] | 2 |
| Trojan.Win32.SpBot [Ikarus] | 2 |
| Trojan.Win32.SpBot.n [Kaspersky Lab] | 2 |
| Trojan:Win32/Bumat!rts [Microsoft] | 2 |
| Trojan:WinNT/Alureon.D [Microsoft] | 2 |
| Trojan:WinNT/Alureon.G [Microsoft] | 2 |
| TrojanDownloader:WinNT/Nupylos.A [Microsoft] | 2 |
| Trojan-Dropper.Win32.Agent.argy [Kaspersky Lab] | 2 |
| TrojanDropper:Win32/Madri.A [Microsoft] | 2 |
| Win-Trojan/Agent.153728 [AhnLab] | 2 |
| Backdoor.Win32.Agent.alwg [Kaspersky Lab] | 1 |
| Backdoor.Win32.Agent.anlf [Kaspersky Lab] | 1 |
| Backdoor.Win32.NewRest.zm [Kaspersky Lab] | 1 |
| Backdoor.WinNT.Haxdoor [Ikarus] | 1 |
| Backdoor:WinNT/Festi.A [Microsoft] | 1 |
| BackDoor-EKJ [McAfee] | 1 |
| BehavesLike [Ikarus] | 1 |
| DNSChanger!cy [McAfee] | 1 |
| DNSChanger!dd [McAfee] | 1 |
| DNSChanger!k [McAfee] | 1 |
| Dropper/Xema.28800 [AhnLab] | 1 |
| Gen.Rootkit [Ikarus] | 1 |
| Generic BackDoor!bgl [McAfee] | 1 |