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Change log for definition version 1.277.947.0

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 (1.277.1102.0), please try hitting refresh or let us know through the feedback link at the bottom of this page.

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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:

Definition available date: Oct 11,2018 04:18 PM UTC

New definitions


Trojan:O97M/Obfuse.H	severe
Trojan:Win32/CryptInject.VT!MTB	severe

Updated definitions


Adware:Win32/BetterSurf	high
Adware:Win32/LoudMo	high
BrowserModifier:Win32/Foxiebro	high
HackTool:Win32/AutoKMS!rfn	high
HackTool:Win32/Keygen!rfn	high
HackTool:Win32/Virledi!rfn	high
TrojanDownloader:Win32/Adload!rfn	high
Backdoor:Linux/Mirai!rfn	severe
Backdoor:MSIL/Bladabindi!rfn	severe
Backdoor:MSIL/Noancooe!bit	severe
Backdoor:Win32/Caphaw!rfn	severe
Backdoor:Win32/Koceg!rfn	severe
Backdoor:Win32/Konus!bit	severe
Backdoor:Win32/Pavica!bit	severe
Backdoor:Win32/Qakbot!rfn	severe
Backdoor:Win32/Xtrat!bit	severe
Backdoor:Win32/Zegost!bit	severe
Backdoor:Win32/Zegost!rfn	severe
Backdoor:Win64/Drixed!rfn	severe
DDoS:Linux/Lightaidra!rfn	severe
DDoS:Win32/Nitol!rfn	severe
Exploit:HTML/IframeRef!rfn	severe
Exploit:Java/CVE-2012-4681!rfn	severe
Exploit:JS/Blacole!rfn	severe
Exploit:O97M/CVE-2017-11882	severe
Exploit:O97M/CVE-2017-11882!rfn	severe
Exploit:Win32/CVE-2018-8120!bit	severe
PWS:Win32/Fareit!bit	severe
PWS:Win32/Fareit!rfn	severe
PWS:Win32/Gendelfan!bit	severe
PWS:Win32/Mofksys!rfn	severe
PWS:Win32/Primarypass!rfn	severe
PWS:Win32/QQpass!rfn	severe
PWS:Win32/Zbot!rfn	severe
Ransom:MSIL/JigsawLocker!rfn	severe
Ransom:Win32/Cerber!rfn	severe
Ransom:Win32/FileCoder!bit	severe
Ransom:Win32/GandCrab!bit	severe
Ransom:Win32/Gandcrab!MTB	severe
Trojan:BAT/Qhost!rfn	severe
Trojan:HTML/Phish	severe
Trojan:HTML/Phishing!bit	severe
Trojan:HTML/Redirector!rfn	severe
Trojan:Java/Adwind!rfn	severe
Trojan:Java/Jibem!bit	severe
Trojan:JS/CoinHive!rfn	severe
Trojan:JS/Gamburl!rfn	severe
Trojan:JS/HideLink!rfn	severe
Trojan:JS/Iframe!rfn	severe
Trojan:JS/Iframeinject!rfn	severe
Trojan:JS/Redirector!bit	severe
Trojan:JS/Redirector!rfn	severe
Trojan:MSIL/Bladabindi!bit	severe
Trojan:MSIL/Eskimo!rfn	severe
Trojan:MSIL/Starter!bit	severe
Trojan:Win32/Adload!rfn	severe
Trojan:Win32/Aenjaris!rfn	severe
Trojan:Win32/Asacky!rfn	severe
Trojan:Win32/Ausiv!rfn	severe
Trojan:Win32/Autcobit!rfn	severe
Trojan:Win32/Autorun!rfn	severe
Trojan:Win32/Backboot!bit	severe
Trojan:Win32/Banbra!bit	severe
Trojan:Win32/Bancteian!rfn	severe
Trojan:Win32/Bitrep.A	severe
Trojan:Win32/Bluteal!rfn	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/CoinMiner!bit	severe
Trojan:Win32/CoinMiner!MTB	severe
Trojan:Win32/CoinMiner!rfn	severe
Trojan:Win32/CryptInject!MTB	severe
Trojan:Win32/CryptInject!rfn	severe
Trojan:Win32/Emotet!bit	severe
Trojan:Win32/Emotet!rfn	severe
Trojan:Win32/Eqtonex!rfn	severe
Trojan:Win32/Folcom!rfn	severe
Trojan:Win32/Gamaredon!bit	severe
Trojan:Win32/GandCrab!rfn	severe
Trojan:Win32/Genbhv	severe
Trojan:Win32/Kasidet!bit	severe
Trojan:Win32/NanoBot!bit	severe
Trojan:Win32/Nymaim!bit	severe
Trojan:Win32/Occamy.C	severe
Trojan:Win32/Pulcare!rfn	severe
Trojan:Win32/Qhost!rfn	severe
Trojan:Win32/RemoteAdmin!bit	severe
Trojan:Win32/Ronohu!rfn	severe
Trojan:Win32/Salgorea!rfn	severe
Trojan:Win32/Simbot!rfn	severe
Trojan:Win32/Skeeyah.A!bit	severe
Trojan:Win32/Skeeyah.A!mtb	severe
Trojan:Win32/Skeeyah.A!rfn	severe
Trojan:Win32/Skeeyah.B!rfn	severe
Trojan:Win32/Spatet!bit	severe
Trojan:Win32/Starer!bit	severe
Trojan:Win32/Starter!bit	severe
Trojan:Win32/Startpage!rfn	severe
Trojan:Win32/Tepely!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/Trickbot	severe
Trojan:Win32/Urelas!rfn	severe
Trojan:Win32/Vflooder!rfn	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/Wdfload	severe
Trojan:Win32/Zonsterarch!rfn	severe
Trojan:Win64/Detrahere!rfn	severe
TrojanClicker:HTML/Iframe!rfn	severe
TrojanClicker:JS/Faceliker!rfn	severe
TrojanDownloader:BAT/Nimcud	severe
TrojanDownloader:JS/FakejQuery!rfn	severe
TrojanDownloader:JS/Nemucod!bit	severe
TrojanDownloader:JS/Nemucod!rfn	severe
TrojanDownloader:O97M/Donoff	severe
TrojanDownloader:O97M/Donoff!ams	severe
TrojanDownloader:O97M/Donoff!rfn	severe
TrojanDownloader:O97M/Dornoe!rfn	severe
TrojanDownloader:O97M/Dornoe.A!ams	severe
TrojanDownloader:VBS/Nemucod	severe
TrojanDownloader:Win32/Dalexis!rfn	severe
TrojanDownloader:Win32/Dapato!bit	severe
TrojanDownloader:Win32/Farfli!rfn	severe
TrojanDownloader:Win32/Gendwnurl!bit	severe
TrojanDownloader:Win32/Pterodo!bit	severe
TrojanDownloader:Win32/Zbot!rfn	severe
TrojanDropper:MSIL/Labapost!bit	severe
TrojanDropper:Win32/Dinwod!rfn	severe
TrojanDropper:Win32/Gendwndrop!bit	severe
TrojanDropper:Win32/Gepys!rfn	severe
TrojanProxy:Win32/Distral!bit	severe
TrojanSpy:MSIL/AgentTesla!bit	severe
TrojanSpy:MSIL/KeyLogger!bit	severe
TrojanSpy:MSIL/Omaneat!bit	severe
TrojanSpy:MSIL/OnLineGames!bit	severe
TrojanSpy:Win32/Banker!bit	severe
TrojanSpy:Win32/Fareit!bit	severe
TrojanSpy:Win32/FormBook!bit	severe
TrojanSpy:Win32/Lydra!rfn	severe
TrojanSpy:Win32/Rebhip!rfn	severe
TrojanSpy:Win32/SocStealer!rfn	severe
VirTool:MSIL/CeeInject!bit	severe
VirTool:MSIL/Injector!bit	severe
VirTool:Win32/CeeInject!bit	severe
VirTool:Win32/DelfInject!bit	severe
VirTool:Win32/Injector!bit	severe
VirTool:Win32/VBInject!bit	severe
Worm:Win32/Ainslot!rfn	severe
Worm:Win32/Autorun!bit	severe
Worm:Win32/Citeary!rfn	severe
Worm:Win32/Dorkbot!rfn	severe
Worm:Win32/Gamarue!rfn	severe
Worm:Win32/Macoute!rfn	severe
Worm:Win32/Mofksys!rfn	severe
Worm:Win32/Mydoom!rfn	severe