Change log for definition version 1.251.901.0 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 13,2017 07:50 PM UTC

New definitions

BrowserModifier:Win32/Foxiebrohigh
SoftwareBundler:Win32/Prepscramhigh
HackTool:MSIL/StormRATmoderate
HackTool:Win32/AutoKMSmoderate
Backdoor:Linux/Mirai!rfnsevere
Backdoor:Win32/Bezigate.Bsevere
Backdoor:Win32/Goggpacsevere
Backdoor:Win32/Hostilsevere
Backdoor:Win32/Kitpolap.Asevere
Backdoor:Win32/Poison.BEsevere
Backdoor:Win32/Rescoms.Asevere
Backdoor:Win32/Rescoms.Bsevere
Backdoor:Win32/Xiclog.Asevere
DDoS:Linux/Lightaidra!rfnsevere
Exploit:JS/Blacole!rfnsevere
PWS:Win32/Primarypass.Asevere
Ransom:Win32/Genasomsevere
Ransom:Win32/Troldesh.Asevere
Trojan:JS/HideLink!rfnsevere
Trojan:MSIL/Bokytuda.A!bitsevere
Trojan:MSIL/Bokytuda.B!bitsevere
Trojan:MSIL/Upadter.Asevere
Trojan:O97M/Madeba.A!detsevere
Trojan:Win32/Autdis.Asevere
Trojan:Win32/Bancteian.Bsevere
Trojan:Win32/Casidel.Asevere
Trojan:Win32/CoinMiner.AC!bitsevere
Trojan:Win32/Dynamer!rfnsevere
Trojan:Win32/Goabeny.A!bitsevere
Trojan:Win32/Injeber.D!bitsevere
Trojan:Win32/Injector.MK!bitsevere
Trojan:Win32/Medfos.AFsevere
Trojan:Win32/Rirlgedsevere
Trojan:Win32/Salrenmetie.Asevere
Trojan:Win32/Skeeyah.A!rfnsevere
Trojan:Win32/Swrort.Asevere
Trojan:Win32/Winexert.B!bitsevere
TrojanClicker:JS/Faceliker!rfnsevere
TrojanDownloader:Win32/Kuluoz.Dsevere
TrojanDownloader:Win32/Unruy.Hsevere
TrojanDropper:MSIL/Vibes.Asevere
TrojanDropper:Win32/Bunitusevere
TrojanDropper:Win32/Gepyssevere
TrojanProxy:Win32/Bunitu.Q!bitsevere
TrojanSpy:MSIL/Yakbeex.Bsevere
TrojanSpy:Win32/Loyeetro.Asevere
TrojanSpy:Win32/Plimrost.Bsevere
TrojanSpy:Win32/Ranbyussevere
TrojanSpy:Win32/Streespyersevere
TrojanSpy:Win32/Tougle!rfnsevere
Worm:Win32/Dorkbotsevere
Worm:Win32/Gamarue.AMsevere
Worm:Win32/Gamarue.ARsevere
Worm:Win32/Hamweqsevere
Worm:Win32/Silly_P2P.Gsevere

Updated definitions

Adware:Win32/Hebogohigh
BrowserModifier:Win32/Diplugemhigh
BrowserModifier:Win32/Webaltahigh
HackTool:MSIL/Boilod.Ahigh
SoftwareBundler:MSIL/Wizremhigh
SoftwareBundler:Win32/ICLoaderhigh
SoftwareBundler:Win32/InstallMonsterhigh
SoftwareBundler:Win32/Mizenotahigh
HackTool:Win32/BrowserPassviewmoderate
HackTool:Win32/ChromePassmoderate
HackTool:Win32/Mailpassviewmoderate
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe.Asevere
Backdoor:MSIL/Noancooe.Csevere
Backdoor:Win32/Bifrosesevere
Backdoor:Win32/Buben.Asevere
Backdoor:Win32/Coolvidoor.Asevere
Backdoor:Win32/Cycbot.Bsevere
Backdoor:Win32/Gaertob.Asevere
Backdoor:Win32/Kelihossevere
Backdoor:Win32/Kelihos.Fsevere
Backdoor:Win32/Kirts.Asevere
Backdoor:Win32/Kocegsevere
Backdoor:Win32/Konus.Asevere
Backdoor:Win32/Noancooe.Dsevere
Backdoor:Win32/Nuclearsevere
Backdoor:Win32/Proratsevere
Backdoor:Win32/ProxyBot.Esevere
Backdoor:Win32/Qakbot.Tsevere
Backdoor:Win32/Simbotsevere
Backdoor:Win32/Turkojansevere
Backdoor:Win32/Xemasevere
Backdoor:Win32/Xtrat.ACsevere
Backdoor:Win32/Zegostsevere
DDoS:Win32/Nitol!rfnsevere
DDoS:Win32/Nitol.Asevere
DDoS:Win32/Nitol.Bsevere
Exploit:Win32/Shellcodesevere
Exploit:Win32/Wmfap.Asevere
PWS:MSIL/Mintluks.Asevere
PWS:Win32/Fareitsevere
PWS:Win32/Fignotok.Asevere
PWS:Win32/Ldpinchsevere
PWS:Win32/Stealer.Msevere
PWS:Win32/Steam.Csevere
PWS:Win32/Tacsasi.Asevere
PWS:Win32/Wedsnot.Asevere
PWS:Win32/Winspysevere
PWS:Win32/Zbot!rfnsevere
Ransom:MSIL/JigsawLocker.Asevere
Ransom:Win32/Dircrypt.Csevere
Rogue:Win32/Winwebsecsevere
Trojan:MSIL/Eskimo.Asevere
Trojan:MSIL/Injectorsevere
Trojan:VBS/Startpage.OEsevere
Trojan:Win32/Adkuadu.Asevere
Trojan:Win32/Agentsevere
Trojan:Win32/Alureonsevere
Trojan:Win32/Alureon!infsevere
Trojan:Win32/Bicone.Bsevere
Trojan:Win32/Blocix.Asevere
Trojan:Win32/Comquab.Asevere
Trojan:Win32/Delfsevere
Trojan:Win32/Delflob.Isevere
Trojan:Win32/Dogrobotsevere
Trojan:Win32/Dorv.Asevere
Trojan:Win32/Estiwir.Csevere
Trojan:Win32/ExtenBro.Asevere
Trojan:Win32/Goabeny!rfnsevere
Trojan:Win32/Grenam.B!infsevere
Trojan:Win32/Helpud.Asevere
Trojan:Win32/Hilotisevere
Trojan:Win32/Imecal.Asevere
Trojan:Win32/Injeber.A!bitsevere
Trojan:Win32/Kplo.Bsevere
Trojan:Win32/Neurevt.ABsevere
Trojan:Win32/Pepatch.Esevere
Trojan:Win32/Rebhip.AA!bitsevere
Trojan:Win32/Redosdru.Esevere
Trojan:Win32/Rofin!rfnsevere
Trojan:Win32/Tcpportscan.Asevere
Trojan:Win32/Tonmyesevere
Trojan:Win32/Vbulla.Asevere
Trojan:Win32/Vicenorsevere
Trojan:Win32/Vinject.Asevere
Trojan:Win32/Winexert!rfnsevere
Trojan:Win32/Zonsterarch.ABsevere
Trojan:Win32/Zonsterarch.ACsevere
Trojan:Win32/Zonsterarch.BWsevere
Trojan:WinNT/Alureon.Hsevere
Trojan:WinREG/Startpage.Esevere
TrojanDownloader:BAT/Ftpersevere
TrojanDownloader:JS/Nemucod!rfnsevere
TrojanDownloader:Win32/Agentsevere
TrojanDownloader:Win32/Cekarsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Dofoil.Dsevere
TrojanDownloader:Win32/Neojit.Asevere
TrojanDownloader:Win32/Perkeshsevere
TrojanDownloader:Win32/Renossevere
TrojanDownloader:Win32/Smallsevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDownloader:Win32/Vitero.Asevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDropper:Win32/Bifrose.Fsevere
TrojanDropper:Win32/Emold.Csevere
TrojanDropper:Win32/Misik.Asevere
TrojanDropper:Win32/Plepilm.Asevere
TrojanDropper:Win32/Sirefef.Bsevere
TrojanDropper:Win32/Surldoesevere
TrojanDropper:Win32/Vundo.AAsevere
TrojanProxy:Win32/Horstsevere
TrojanSpy:MSIL/Golroted.Asevere
TrojanSpy:MSIL/Golroted.Bsevere
TrojanSpy:MSIL/Golroted.Esevere
TrojanSpy:MSIL/Golroted.Fsevere
TrojanSpy:MSIL/Hoetou.ACsevere
TrojanSpy:MSIL/Omaneat.Asevere
TrojanSpy:MSIL/Omaneat.Bsevere
TrojanSpy:MSIL/Omaneat.Csevere
TrojanSpy:MSIL/Omaneat.F!bitsevere
TrojanSpy:Win32/Agentsevere
TrojanSpy:Win32/Bancossevere
TrojanSpy:Win32/Lydrasevere
TrojanSpy:Win32/Rebhip.Csevere
TrojanSpy:Win32/Usteal.Dsevere
TrojanSpy:Win32/Vwealersevere
VirTool:INF/Autorunsevere
VirTool:MSIL/Injectorsevere
VirTool:MSIL/Subti.Nsevere
VirTool:Win32/CeeInjectsevere
VirTool:Win32/DelfInjectsevere
VirTool:Win32/Delfsnifsevere
VirTool:Win32/Injectorsevere
VirTool:Win32/Vbindersevere
VirTool:Win32/VBInjectsevere
VirTool:WinNT/Bohu.Asevere
Worm:MSIL/Necast.Hsevere
Worm:Win32/Ainslot.Asevere
Worm:Win32/Autorunsevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Gamarue.APsevere
Worm:Win32/Gamarue.Isevere
Worm:Win32/Mofksys.Asevere
Worm:Win32/NewWormsevere
Worm:Win32/Nuqel.TAsevere
Worm:Win32/Prolacosevere
Worm:Win32/Rebhipsevere
Worm:Win32/Slenpingsevere
Worm:Win32/VBsevere
Worm:Win32/Xtrat.B!Asevere