| Threat Alias | Number of Incidents |
| REG_ZAPCHAST.ED [Trend Micro] | 18,582 |
| Reg/IRCSpoolsv [McAfee] | 18,126 |
| Backdoor.IRC.Zapchast.zwrc [Kaspersky Lab] | 14,936 |
| Backdoor.IRC.Zapchast [Ikarus] | 13,570 |
| Trojan.RunKeys [PC Tools] | 13,224 |
| REG/Zapchast [AhnLab] | 3,648 |
| Backdoor.Zapchast [Ikarus] | 2,166 |
| Trojan.DL.VB.AAVI [PC Tools] | 1,135 |
| BKDR_CIADOOR.EA [Trend Micro] | 814 |
| Backdoor.IRC.Bot [Symantec] | 810 |
| Trojan-Downloader.Win32.VB.bsa [Kaspersky Lab] | 661 |
| Downloader.gen.a [McAfee] | 654 |
| not-a-virus:Client-IRC.Win32.mIRC.603 [Kaspersky Lab] | 572 |
| Renamed mIRC Client [McAfee] | 382 |
| not-a-virus:Client-IRC.Win32.mIRC.59 [Kaspersky Lab] | 346 |
| Trojan mIRC Client [McAfee] | 265 |
| Backdoor.mIRC [PC Tools] | 256 |
| IRC/Flood.mirc [McAfee] | 247 |
| IRC-Worm.Win32.Tedeto.a [Ikarus] | 233 |
| BrowserModifier:Win32/IGetNet [Microsoft] | 224 |
| Troj/IRCFlood-T [Sophos] | 224 |
| TROJ_INFECTED.AY [Trend Micro] | 210 |
| Generic.dx [McAfee] | 199 |
| Win-Trojan/MircPack.1790464 [AhnLab] | 150 |
| TROJ_DLOADER.FXN [Trend Micro] | 139 |
| Backdoor.IRCBot [PC Tools] | 127 |
| IRC.Flood.CI [PC Tools] | 91 |
| Downloader-BJM [McAfee] | 85 |
| Troj/Agent-GGQ [Sophos] | 85 |
| TrojanDownloader:Win32/VB [Microsoft] | 81 |
| Backdoor.IRC.Zapchast [PC Tools] | 79 |
| IRC/Client [McAfee] | 72 |
| TROJ_Generic [Trend Micro] | 64 |
| Backdoor.IRC.Zapchast [Kaspersky Lab] | 60 |
| TROJ_DLOADER.KYU [Trend Micro] | 57 |
| Win-Trojan/Xema.variant [AhnLab] | 53 |
| not-a-virus:Client-IRC.Win32.mIRC.602 [Kaspersky Lab] | 52 |
| not-a-virus:Client-IRC.Win32.mIRC [Ikarus] | 47 |
| not-a-virus:Client-IRC.Win32.mIRC.601 [Kaspersky Lab] | 46 |
| Troj/Mirchack-L [Sophos] | 45 |
| Virus.Win32.VB.FXE [Ikarus] | 43 |
| Backdoor.Trojan [Symantec] | 42 |
| Trojan.IRC-Backdoor [PC Tools] | 39 |
| Backdoor:Win32/Kirsun.A [Microsoft] | 33 |
| Troj/Kirsun-A [Sophos] | 33 |
| BKDR_IRCBOT.BMF [Trend Micro] | 32 |
| TROJ_IRCFLOOD.O [Trend Micro] | 32 |
| BKDR_MIRC.AA [Trend Micro] | 30 |
| Mal/Generic-A [Sophos] | 29 |
| mIRC/Zapchast [AhnLab] | 27 |
| Troj/Zapchas-DN [Sophos] | 27 |
| Generic PUP.x [McAfee] | 25 |
| Troj/Zapchas-EJ [Sophos] | 24 |
| Win-Trojan/Kirsun.652800 [AhnLab] | 24 |
| not-a-virus:Client-IRC.Win32.mIRC.616 [Kaspersky Lab] | 20 |
| Backdoor.Generic [Ikarus] | 18 |
| Backdoor.IRC!ct [PC Tools] | 18 |
| Backdoor.IRCBot.XGK [PC Tools] | 18 |
| BKDR_KIRSUN.A [Trend Micro] | 18 |
| Generic IRC.b [McAfee] | 15 |
| VirTool:Win32/VBInject.C [Microsoft] | 14 |
| Backdoor:Win32/IRCbot [Microsoft] | 13 |
| W32/Vbbot [McAfee] | 13 |
| BKDR_CIADOOR.BU [Trend Micro] | 12 |
| BKDR_IRC.AJ [Trend Micro] | 12 |
| Backdoor:Win32/mIRCbased [Microsoft] | 11 |
| not-a-virus:Client-IRC.Win32.mIRC.60 [Kaspersky Lab] | 11 |
| TROJ_DLOADER.YGM [Trend Micro] | 11 |
| Backdoor:Win32/Lamin.A [Microsoft] | 10 |
| IRC-Worm.Generic [Ikarus] | 10 |
| Mal/Behav-211 [Sophos] | 10 |
| Troj/Zapchas-U [Sophos] | 10 |
| Virus.Win32.Zapchast.CR [Ikarus] | 10 |
| Backdoor.Hupigon.GEN [PC Tools] | 9 |
| Backdoor.IRC.Besik.A [Ikarus] | 9 |
| Generic PUP.i [McAfee] | 9 |
| not-a-virus:Client-IRC.Win32.mIRC.561 [Kaspersky Lab] | 9 |
| Trojan-Dropper.Win32.VB.ams [Kaspersky Lab] | 9 |
| VirTool:Win32/Vtub.BY [Microsoft] | 9 |
| Generic Downloader.x [McAfee] | 8 |
| Mal/EncPk-FL [Sophos] | 8 |
| Trojan-Downloader.VB!sd6 [PC Tools] | 8 |
| Packed.Win32.Klone [Ikarus] | 7 |
| TROJ_DROPPER.ACO [Trend Micro] | 7 |
| Virus.Win32.SdBot.4142 [Ikarus] | 7 |
| Backdoor.IRC.ABN [PC Tools] | 6 |
| BKDR_IRCFLOOD.AC [Trend Micro] | 6 |
| Trojan-Spy.Win32.Logger.e [Kaspersky Lab] | 6 |
| Win32/IRCBot.worm.variant [AhnLab] | 6 |
| Backdoor.Win32.VanBot.ll [Kaspersky Lab] | 5 |
| Gen.Trojan [Ikarus] | 5 |
| Virus.Win32.TratBHO [Ikarus] | 5 |
| W32/Nirbot.worm [McAfee] | 5 |
| Win-Trojan/Poisonivy.159247 [AhnLab] | 5 |
| Backdoor:Win32/IRCbot.S [Microsoft] | 4 |
| BKDR_IRCFLOOD.AG [Trend Micro] | 4 |
| Generic PUP.z [McAfee] | 4 |
| Generic PWS.y [McAfee] | 4 |
| not-a-virus:Client-IRC.Win32.mIRC.591 [Kaspersky Lab] | 4 |
| Troj/Banker-APQ [Sophos] | 4 |