Change log for definition version 1.249.991.0 RSS feed icon

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

If this page does not show change logs for the latest update (1.269.69.0), please try hitting refresh or let us know through the feedback link at the bottom of this page.

Download the latest update

Select change log

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:

Get change log

Definition available date: Aug 13,2017 06:46 AM UTC

New definitions

Adware:Win32/Pirrithigh
HackTool:Win32/AutoKMSmoderate
HackTool:Win32/Gsecdump!rfnmoderate
HackTool:Win32/Rabasedmoderate
Backdoor:Linux/Mirai!rfnsevere
Backdoor:Win32/NCX!rfnsevere
Backdoor:Win32/NetWiredRC.Bsevere
Backdoor:Win32/Oztratz.Asevere
Backdoor:Win32/Pterodo!rfnsevere
Backdoor:Win32/Rescoms.Asevere
Backdoor:Win32/Xiclog.Asevere
PWS:Win32/Mofksys!rfnsevere
PWS:Win32/Stimilina.D!bitsevere
Ransom:AndroidOS/Koler!rfnsevere
Ransom:MSIL/LockScreen!rfnsevere
Ransom:Win32/Betisrypt!rfnsevere
Ransom:Win32/Betisrypt.Bsevere
Ransom:Win32/Genasomsevere
Ransom:Win32/Spora!rfnsevere
SupportScam:JS/TechBrolo!rfnsevere
Trojan:AndroidOS/BoxerSms!rfnsevere
Trojan:AndroidOS/Crusewind!rfnsevere
Trojan:AndroidOS/Kapuser!rfnsevere
Trojan:AndroidOS/Plankton!rfnsevere
Trojan:JS/HideLink!rfnsevere
Trojan:MSIL/Bokytuda.B!bitsevere
Trojan:MSIL/Dematali!dtasevere
Trojan:Win32/Aenjaris!rfnsevere
Trojan:Win32/Bancteian!rfnsevere
Trojan:Win32/Bancteian.Bsevere
Trojan:Win32/Carberp!rfnsevere
Trojan:Win32/Ceatrg.Asevere
Trojan:Win32/Dynamer!rfnsevere
Trojan:Win32/Malexsevere
Trojan:Win32/MineBicoin!rfnsevere
Trojan:Win32/Qadars.C!bitsevere
Trojan:Win32/Salrenmetie.Asevere
Trojan:Win32/Skeeyah.A!rfnsevere
Trojan:Win32/Swrort.Asevere
Trojan:Win32/Totbrick!rfnsevere
Trojan:Win32/Vastloust.Asevere
TrojanClicker:JS/Faceliker!rfnsevere
TrojanDownloader:Win32/Filoskeed!rfnsevere
TrojanDownloader:Win32/Silcon!rfnsevere
TrojanDownloader:Win32/Startpage!rfnsevere
TrojanDropper:Win32/Bunitusevere
TrojanDropper:Win32/Gepyssevere
TrojanProxy:Win32/Bunitu.Q!bitsevere
TrojanSpy:Win32/Heeshnik.Asevere
TrojanSpy:Win32/Tinukebot.A!bitsevere
TrojanSpy:Win32/Tougle!rfnsevere
VirTool:MSIL/Subti.Csevere
VirTool:MSIL/Subti.Ksevere
Worm:Win32/Dipasik.C!bitsevere
Worm:Win32/Killav!rfnsevere

Updated definitions

Adware:Win32/AddLyricshigh
Adware:Win32/Hebogohigh
BrowserModifier:Win32/Diplugemhigh
BrowserModifier:Win32/Webaltahigh
HackTool:MSIL/Boilod.Ahigh
SoftwareBundler:MSIL/Wizremhigh
SoftwareBundler:Win32/Mizenotahigh
SoftwareBundler:Win32/Techsnabhigh
Trojan:Win32/Startpagehigh
TrojanDownloader:Win32/Adload!rfnhigh
HackTool:Win32/AutoKMS!rfnmoderate
HackTool:Win32/Wincred!rfnmoderate
HackTool:Win32/WpePro!rfnmoderate
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe.Csevere
Backdoor:Win32/Gaertob.Asevere
Backdoor:Win32/Qakbot!rfnsevere
Backdoor:Win32/Qakbot.Tsevere
Backdoor:Win32/SdBot!rfnsevere
Backdoor:Win32/Slingup!rfnsevere
Backdoor:Win32/Tofsee!rfnsevere
Backdoor:Win32/Zegostsevere
Backdoor:Win32/Zegost!rfnsevere
DDoS:Win32/Nitol.Asevere
DDoS:Win32/Nitol.Bsevere
Exploit:Java/CVE-2012-4681!rfnsevere
Exploit:JS/Axpergle!rfnsevere
PWS:HTML/Phish!rfnsevere
PWS:Win32/Fareitsevere
PWS:Win32/Frethog!rfnsevere
PWS:Win32/Lmir!rfnsevere
PWS:Win32/Zbot!CIsevere
Ransom:AndroidOS/LockScreen!rfnsevere
Ransom:MSIL/JigsawLocker!rfnsevere
Trojan:AndroidOS/FakeNotify!rfnsevere
Trojan:AndroidOS/GingerMaster!rfnsevere
Trojan:HTML/Redirector!rfnsevere
Trojan:JS/Redirector!rfnsevere
Trojan:MSIL/Starter.Fsevere
Trojan:Win32/Asacky.A!bitsevere
Trojan:Win32/Carberp.Ksevere
Trojan:Win32/CoinMiner!rfnsevere
Trojan:Win32/Dorv.Asevere
Trojan:Win32/Dynamer!acsevere
Trojan:Win32/Facetake!rfnsevere
Trojan:Win32/Floxif!rfnsevere
Trojan:Win32/Goabeny!rfnsevere
Trojan:Win32/Injeber.A!bitsevere
Trojan:Win32/Lethic!rfnsevere
Trojan:Win32/Nivdort.Asevere
Trojan:Win32/Qzonit.A!bitsevere
Trojan:Win32/Rimecud!rfnsevere
Trojan:Win32/Salgorea.C!dhasevere
Trojan:Win32/Starter.Psevere
Trojan:Win32/Swrort!rfnsevere
Trojan:Win32/Tonmyesevere
Trojan:Win32/Vinor.Asevere
Trojan:Win32/Vundosevere
Trojan:Win32/Wraut.Bsevere
Trojan:Win64/Alureon!rfnsevere
Trojan:WinNT/Mooqkel!rfnsevere
TrojanDownloader:JS/Nemucodsevere
TrojanDownloader:JS/Nemucod!rfnsevere
TrojanDownloader:MSIL/Pstinb.Asevere
TrojanDownloader:O97M/Donoff!rfnsevere
TrojanDownloader:Win32/Brantall!rfnsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/FakeIE.Bsevere
TrojanDownloader:Win32/Farfli!rfnsevere
TrojanDownloader:Win32/Gendwnurl!rfnsevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDropper:Win32/Bunitu.Gsevere
TrojanDropper:Win32/Randrew.A!bitsevere
TrojanDropper:Win32/Woozlist.Bsevere
TrojanProxy:Win32/Tarayt!rfnsevere
TrojanSpy:MSIL/Golroted.Asevere
TrojanSpy:MSIL/Golroted.Esevere
TrojanSpy:MSIL/Omaneat.Bsevere
TrojanSpy:Win32/Bankersevere
TrojanSpy:Win32/Banker!rfnsevere
VirTool:MSIL/Injectorsevere
VirTool:MSIL/Obfuscator.AS!rebhipsevere
VirTool:MSIL/Subti.Nsevere
VirTool:Win32/DelfInjectsevere
VirTool:Win32/Injectorsevere
VirTool:WinNT/Rootkitdrvsevere
Worm:MSIL/Necast.Jsevere
Worm:Win32/Dorkbot!rfnsevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Gamarue.AUsevere
Worm:Win32/Mira!rfnsevere
Worm:Win32/Phorpiex.Bsevere