| Threat Alias | Number of Incidents |
| Backdoor.Zapchast.EI [PC Tools] | 3,954 |
| Troj/Zapchas-EH [Sophos] | 2,881 |
| Backdoor.Cloner.BI [Ikarus] | 2,680 |
| Backdoor.IRC.Zapchast [Kaspersky Lab] | 749 |
| Backdoor.IRC.Zapchast [Ikarus] | 701 |
| Backdoor.IRC.Zapchast.zwrc [Kaspersky Lab] | 519 |
| VBS/Zapchast [AhnLab] | 499 |
| IRC.Zapchast.AQ [PC Tools] | 472 |
| IRC/Flood.ev [McAfee] | 457 |
| REG_ZAPCHAST.BV [Trend Micro] | 441 |
| Mal/Generic-A [Sophos] | 249 |
| Backdoor.IRC.Zapchast.zwrc [PC Tools] | 242 |
| Backdoor.Win32.Turkojan.gr [Kaspersky Lab] | 225 |
| BackDoor-ARL [McAfee] | 225 |
| PWS:Win32/Agent.HM [Microsoft] | 225 |
| IRC.Flood.CI [PC Tools] | 191 |
| IRC.Flood.CJ [PC Tools] | 175 |
| IRC/Flood [McAfee] | 171 |
| Backdoor.Turkojan [PC Tools] | 165 |
| Win-Trojan/Turkojan.290304 [AhnLab] | 135 |
| Backdoor.mIRC [PC Tools] | 134 |
| IRC/Flood.c [McAfee] | 130 |
| Generic.dx [McAfee] | 92 |
| Backdoor.IRC.Agent.b [Kaspersky Lab] | 91 |
| Trojan.Zapchas.F [Ikarus] | 88 |
| BAT.Flood.AH [PC Tools] | 81 |
| Bat/knlk [McAfee] | 81 |
| Backdoor.Win32.Turkojan [Ikarus] | 75 |
| W32/Zapchas-DW [Sophos] | 72 |
| IRC_Generic.CON [Trend Micro] | 70 |
| Backdoor:IRC/Flood.BZ [Microsoft] | 63 |
| Backdoor:Win32/WinBot [Microsoft] | 63 |
| IRC/Flood.gen.c [McAfee] | 63 |
| IRC_ZAPCHAST.HQ [Trend Micro] | 56 |
| mIRC/Zapchast [AhnLab] | 54 |
| Trojan.Agent [Ikarus] | 52 |
| W32/Sdbot.worm.gen.cc [McAfee] | 51 |
| VBS/Xema [AhnLab] | 49 |
| Backdoor.IRC.ABN [PC Tools] | 48 |
| Trojan.IRC [Ikarus] | 47 |
| Troj/IRCFlood-O [Sophos] | 44 |
| not-a-virus:Client-IRC.Win32.mIRC.591 [Kaspersky Lab] | 39 |
| IRC_Generic [Trend Micro] | 37 |
| Generic.dl [McAfee] | 36 |
| IRC/Flood.mirc [McAfee] | 36 |
| TROJ_AGENT.DAW [Trend Micro] | 36 |
| Trojan.Flood.BM [PC Tools] | 36 |
| TROJ_Generic [Trend Micro] | 34 |
| Backdoor.Ircflood [Ikarus] | 33 |
| Trojan.IRCBot [PC Tools] | 33 |
| VirTool:Win32/DelfInject.gen!X [Microsoft] | 33 |
| Backdoor.IRCBot!sd6 [PC Tools] | 31 |
| not-a-virus:Client-IRC.Win32.mIRC.603 [Kaspersky Lab] | 31 |
| Backdoor.Turkojan.AD [PC Tools] | 30 |
| not-a-virus:PSWTool.Win32.MPR.015 [Ikarus] | 30 |
| Troj/Zapchas-DY [Sophos] | 28 |
| IRC/Generic Flooder [McAfee] | 27 |
| Worm:Win32/Hamweq.E [Microsoft] | 26 |
| Generic.du [McAfee] | 25 |
| IRC/Flood.i [McAfee] | 25 |
| not-a-virus:Client-IRC.Win32.mIRC.507 [Kaspersky Lab] | 25 |
| TROJ_FLOOD.C [Trend Micro] | 25 |
| Trojan.Win32.Delf.acq [Kaspersky Lab] | 25 |
| Trojan.Zapchast!ct [PC Tools] | 24 |
| W32/SillyFDC-CK [Sophos] | 24 |
| Mal/Zapchas-A [Sophos] | 23 |
| Trojan:IRC/Flood.BF [Microsoft] | 21 |
| Backdoor.IRC.Cloner.ae [Kaspersky Lab] | 20 |
| not-a-virus:Client-IRC.Win32.mIRC.616 [Kaspersky Lab] | 20 |
| Generic.Sdbot [Ikarus] | 19 |
| PE_Generic [Trend Micro] | 18 |
| Backdoor.IRC.Flood.a [Kaspersky Lab] | 17 |
| Generic PUP.x [McAfee] | 17 |
| not-a-virus:Client-IRC.Win32.mIRC [Ikarus] | 17 |
| Backdoor.IRC.Flood.a [PC Tools] | 16 |
| Downloader.gen.a [McAfee] | 16 |
| IRC/Flood.dh [McAfee] | 16 |
| TROJ_DELF.ITU [Trend Micro] | 16 |
| TROJ_Generic.ZA [Trend Micro] | 16 |
| Trojan-DDoS.Win32.Agent.bs [Kaspersky Lab] | 16 |
| BKDR_TURKOJAN.K [Trend Micro] | 15 |
| IRC.Flood.BU [PC Tools] | 15 |
| TROJ_IRCFLOOD.AW [Trend Micro] | 15 |
| Troj/Zapchas-CZ [Sophos] | 14 |
| Generic Delphi [McAfee] | 13 |
| Net-Worm.Win32.Randon.A [Ikarus] | 13 |
| IRC/Flood.fc [McAfee] | 12 |
| IRC_Generic.ADV [Trend Micro] | 12 |
| Backdoor.IRCBot [PC Tools] | 11 |
| Backdoor.Win32.IRCBot.dhr [Kaspersky Lab] | 11 |
| mIRC/Agent [AhnLab] | 11 |
| not-a-virus:RiskTool.Win32.HideWindows [Kaspersky Lab] | 11 |
| Troj/IRCBot-ABP [Sophos] | 11 |
| Trojan.Win32.Agent.dlo [Kaspersky Lab] | 11 |
| Trojan-DDoS.Win32.Agent.cc [Kaspersky Lab] | 11 |
| BackDoor-CEP.svr [McAfee] | 10 |
| Net-Worm.Win32.Randon [Ikarus] | 10 |
| Trojan.IRC.Flood.ISC [Ikarus] | 10 |
| Generic BackDoor [McAfee] | 9 |
| Generic Dropper [McAfee] | 9 |