Change log for definition version 1.261.1531.0 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: Feb 23,2018 03:18 AM UTC

New definitions


No new threats have been identified in this definition update.

Updated definitions

BrowserModifier:Win32/Diplugemhigh
SoftwareBundler:MSIL/Wizremhigh
SoftwareBundler:Win32/Dlhelperhigh
SoftwareBundler:Win32/FileTourhigh
SoftwareBundler:Win32/InstallMonsterhigh
SoftwareBundler:Win32/Mizenotahigh
SoftwareBundler:Win32/Techsnabhigh
Trojan:Win32/Qhosthigh
TrojanDownloader:Win32/Adloadhigh
TrojanDownloader:Win32/Adload!rfnhigh
TrojanDownloader:Win32/Delfhigh
HackTool:MSIL/Wpakill.Amoderate
HackTool:Win32/AutoKMS!rfnmoderate
HackTool:Win32/BCoinMinemoderate
HackTool:Win32/Rabasedmoderate
HackTool:Win32/Virledi.Amoderate
Backdoor:Linux/Mirai!rfnsevere
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe.Csevere
Backdoor:Win32/Bifrosesevere
Backdoor:Win32/Delfsevere
Backdoor:Win32/Farfli.Gsevere
Backdoor:Win32/Gaertob.Asevere
Backdoor:Win32/Hostilsevere
Backdoor:Win32/Kelihossevere
Backdoor:Win32/Kelihos.Fsevere
Backdoor:Win32/Kirts.Asevere
Backdoor:Win32/Kocegsevere
Backdoor:Win32/Prorat.ACsevere
Backdoor:Win32/Protos.Asevere
Backdoor:Win32/Qakbot.Tsevere
Backdoor:Win32/Rbotsevere
Backdoor:Win32/Rescoms.Bsevere
Backdoor:Win32/Tenpeqsevere
Backdoor:Win32/Tofsee!rfnsevere
Backdoor:Win32/Turkojan.Csevere
Backdoor:Win32/Xiclog.Asevere
Backdoor:Win32/Xtrat.ACsevere
Backdoor:Win32/Zegostsevere
Backdoor:Win64/Drixed!rfnsevere
DDoS:Linux/Lightaidra!rfnsevere
DDoS:Win32/Nitol!rfnsevere
DDoS:Win32/Nitol.Bsevere
Exploit:HTML/IframeRefsevere
Exploit:O97M/Ficerip.A!dhasevere
Exploit:Win32/Shellcodesevere
PWS:HTML/Phishsevere
PWS:MSIL/Mintluks.Asevere
PWS:PDF/Phishsevere
PWS:Win32/Fareitsevere
PWS:Win32/Fareit!rfnsevere
PWS:Win32/Fignotok.Asevere
PWS:Win32/Gamaniasevere
PWS:Win32/Kotwir.A.dllsevere
PWS:Win32/OnLineGamessevere
PWS:Win32/Primarypass.Asevere
PWS:Win32/PWSteal.Q!bitsevere
PWS:Win32/Zbot!GOsevere
PWS:Win32/Zbot!VMsevere
Ransom:Win32/GandCrab.Bsevere
Ransom:Win32/Grymegat.Asevere
Ransom:Win32/Urausy.Csevere
Ransom:Win32/Wadhrama.A!rsmsevere
Rogue:Win32/FakeReansevere
Rogue:Win32/FakeVimessevere
Spammer:Win32/Morphisil.Asevere
SupportScam:JS/TechBrolo!rfnsevere
Trojan:HTML/Phishsevere
Trojan:Java/Jaraut.Bsevere
Trojan:JS/HideLink!rfnsevere
Trojan:JS/Redirector!rfnsevere
Trojan:MSIL/CoinMiner!rfnsevere
Trojan:MSIL/Starter.Fsevere
Trojan:Win32/Adclicker.ASsevere
Trojan:Win32/Alureonsevere
Trojan:Win32/Bancteian!rfnsevere
Trojan:Win32/Bancteian.Bsevere
Trojan:Win32/BHOsevere
Trojan:Win32/Blocix.Asevere
Trojan:Win32/Casidel.Asevere
Trojan:Win32/CoinMiner.AC!bitsevere
Trojan:Win32/CoinMiner.BW!bitsevere
Trojan:Win32/Daekom.Bsevere
Trojan:Win32/Diamin.Fsevere
Trojan:Win32/Dynamer!acsevere
Trojan:Win32/Dynamer!rfnsevere
Trojan:Win32/Emotet!rfnsevere
Trojan:Win32/Exgectow.Asevere
Trojan:Win32/Genasep.Asevere
Trojan:Win32/Helpud.Asevere
Trojan:Win32/Inhoo.Asevere
Trojan:Win32/Koutodoor.E.dllsevere
Trojan:Win32/Malachite!rfnsevere
Trojan:Win32/Nebuler.Ksevere
Trojan:Win32/Neurevt.ABsevere
Trojan:Win32/Nivdort.Asevere
Trojan:Win32/Occamy.Asevere
Trojan:Win32/Occamy.Bsevere
Trojan:Win32/Puppetzombiesevere
Trojan:Win32/Pynamer.A!acsevere
Trojan:Win32/Pynamer.B!acsevere
Trojan:Win32/Qhost!rfnsevere
Trojan:Win32/Rnrpctl.Asevere
Trojan:Win32/Ronohu.Asevere
Trojan:Win32/Ropest.Jsevere
Trojan:Win32/Sakurel!rfnsevere
Trojan:Win32/Salgorea.C!dhasevere
Trojan:Win32/Scrarev.Csevere
Trojan:Win32/Searmapxp.A!bitsevere
Trojan:Win32/Shampel!rfnsevere
Trojan:Win32/Sirefef.Vsevere
Trojan:Win32/Skeeyah.A!rfnsevere
Trojan:Win32/Sonoko.A!mssevere
Trojan:Win32/Starter.Psevere
Trojan:Win32/StartPage.ZK!bitsevere
Trojan:Win32/Suloc.Asevere
Trojan:Win32/Tiggre!rfnsevere
Trojan:Win32/Tilcunsevere
Trojan:Win32/Tonmyesevere
Trojan:Win32/Totbrick.Hsevere
Trojan:Win32/Urelas.AAsevere
Trojan:Win32/Vbulla.Asevere
Trojan:Win32/Vindor.Bsevere
Trojan:Win32/Zonsterarch.BWsevere
Trojan:Win64/Alureon!rfnsevere
Trojan:Win64/MineBicoin.Ysevere
TrojanClicker:JS/Faceliker!rfnsevere
TrojanClicker:Win32/Zeriest.Bsevere
TrojanDownloader:HTML/Adodbsevere
TrojanDownloader:JS/FakejQuery!rfnsevere
TrojanDownloader:Win32/Brantall!rfnsevere
TrojanDownloader:Win32/Cekarsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Nymaim.Ksevere
TrojanDownloader:Win32/Pogolcil.E!bitsevere
TrojanDownloader:Win32/Redosdru.Csevere
TrojanDownloader:Win32/Renossevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDownloader:Win32/Unruy.Hsevere
TrojanDownloader:Win32/VBsevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDownloader:Win32/Zirit.Asevere
TrojanDropper:Win32/Delfsevere
TrojanDropper:Win32/FnDialersevere
TrojanDropper:Win32/Gepyssevere
TrojanDropper:Win32/Gernidrusevere
TrojanDropper:Win32/Minmal.Asevere
TrojanDropper:Win32/Sirefefsevere
TrojanDropper:Win32/Woozlist.Bsevere
TrojanDropper:Win32/Zirit.Dsevere
TrojanProxy:Win32/Bunitu.Q!bitsevere
TrojanSpy:MSIL/Golroted.Asevere
TrojanSpy:MSIL/Omaneat.Bsevere
TrojanSpy:MSIL/VB.Msevere
TrojanSpy:Win32/Delfsevere
TrojanSpy:Win32/Flux.ADsevere
TrojanSpy:Win32/Tougle.G!bitsevere
TrojanSpy:Win32/Usteal.Dsevere
VirTool:MSIL/Injectorsevere
VirTool:MSIL/Subti.Nsevere
VirTool:Win32/AutObfus.Nsevere
VirTool:Win32/DelfInjectsevere
VirTool:Win32/Injectorsevere
VirTool:Win32/VBInjectsevere
Worm:Win32/Ainslot.Asevere
Worm:Win32/Autorun!rfnsevere
Worm:Win32/Brontok!rfnsevere
Worm:Win32/Citeary.Esevere
Worm:Win32/Dorkbotsevere
Worm:Win32/Emerleoxsevere
Worm:Win32/Enosch.Asevere
Worm:Win32/Esfury.Xsevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Gamarue.ARsevere
Worm:Win32/Gamarue.ATsevere
Worm:Win32/Mamianunesevere
Worm:Win32/Mira.Asevere
Worm:Win32/NewWormsevere
Worm:Win32/Rebhipsevere
Worm:Win32/Silly_P2P.Gsevere
Worm:Win32/Sirefefsevere
Worm:Win32/VBsevere
Worm:Win32/Vexral.Asevere
Worm:Win32/Wahrecks.Asevere
Worm:Win32/Yuner.ACsevere