Change log for definition version 1.251.927.0 RSS feed icon

This page lists what has changed in the most recent definitions update for Windows Defender Antivirus and Microsoft Security Essentials.

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The following tables list the new and updated definitions for the version you select here. You can choose from the 20 latest updates, and the most recent update is shown by default:

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Definition available date: Sep 14,2017 05:23 AM UTC

New definitions

Updated definitions

HackTool:MSIL/Boilod.Ahigh
SoftwareBundler:MSIL/Wizremhigh
HackTool:Win32/AutoKMS!rfnmoderate
HackTool:Win32/Keygenmoderate
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe.Csevere
Backdoor:Win32/Bifrosesevere
Backdoor:Win32/Blohi.Bsevere
Backdoor:Win32/PcClientsevere
Backdoor:Win32/Poison!rfnsevere
Backdoor:Win32/Qakbot!rfnsevere
Backdoor:Win32/Qakbot.Tsevere
Backdoor:Win32/Sdbotsevere
Backdoor:Win32/Xtrat.ACsevere
Backdoor:Win32/Zegostsevere
Behavior:Win32/FsoScriptTmpPE.Asevere
Behavior:Win32/UnKnownFileWatchDog.gen!Bsevere
DDoS:Win32/Nitol!rfnsevere
DDoS:Win32/Nitol.Asevere
Exploit:Win32/Chippto.Fsevere
Exploit:Win32/Shellcodesevere
PWS:Win32/Fareitsevere
PWS:Win32/Lineagesevere
PWS:Win32/Lmirsevere
PWS:Win32/Nabrek.Asevere
PWS:Win32/QQRob.Tsevere
PWS:Win32/Sinowal.Vsevere
PWS:Win32/Zbot!GOsevere
PWS:Win32/Zbot!VMsevere
Ransom:MSIL/JigsawLocker.Asevere
Ransom:Win32/LockScreensevere
Rogue:Win32/Winwebsecsevere
Trojan:JS/Redirector!rfnsevere
Trojan:Win32/Alureonsevere
Trojan:Win32/Anomalysevere
Trojan:Win32/Blocix.Asevere
Trojan:Win32/Dusvext.Bsevere
Trojan:Win32/Dynamer!acsevere
Trojan:Win32/Estiwirsevere
Trojan:Win32/Estiwir.Csevere
Trojan:Win32/Goabeny!rfnsevere
Trojan:Win32/Grenam.B!infsevere
Trojan:Win32/Helpud.Asevere
Trojan:Win32/Miuref!rfnsevere
Trojan:Win32/Nivdort.Asevere
Trojan:Win32/Rimod!rfnsevere
Trojan:Win32/Salgorea.C!dhasevere
Trojan:Win32/Tarifarch!rfnsevere
Trojan:Win32/Tinba.Fsevere
Trojan:Win32/Vundosevere
Trojan:Win32/Woripecssevere
Trojan:Win32/Zonsterarch.BWsevere
Trojan:Win64/MineBicoin.Ysevere
Trojan:Win64/SvcMiner!rfnsevere
Trojan:WinNT/Alureon.Hsevere
Trojan:WinREG/Startpage.Esevere
TrojanClicker:Win32/Erbon!rfnsevere
TrojanDownloader:Java/Banload!rfnsevere
TrojanDownloader:Win32/Agentsevere
TrojanDownloader:Win32/Cekarsevere
TrojanDownloader:Win32/Dofoil!rfnsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Qulkonwi.Csevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDownloader:Win32/Ufraie.Asevere
TrojanDownloader:Win32/VBsevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDropper:Win32/Lazylock.Asevere
TrojanDropper:Win32/Randrew.A!bitsevere
TrojanSpy:MSIL/Golroted.Bsevere
TrojanSpy:MSIL/Omaneat.Bsevere
TrojanSpy:MSIL/Plimrost.Bsevere
TrojanSpy:MSIL/VB.Fsevere
TrojanSpy:MSIL/VB.Msevere
TrojanSpy:Win32/Bancossevere
TrojanSpy:Win32/Lydrasevere
TrojanSpy:Win32/VBsevere
VirTool:MSIL/Subti.Nsevere
VirTool:Win32/DelfInjectsevere
VirTool:Win32/Delfsnifsevere
VirTool:Win32/VBInjectsevere
Virus:Win32/Floxif.Hsevere
Worm:Win32/Ainslot.Asevere
Worm:Win32/Emudbot.Asevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Mocmexsevere
Worm:Win32/Mofksys.Asevere
Worm:Win32/Rebhipsevere
Worm:Win32/Slenpingsevere
Worm:Win32/VBsevere