Change log for definition version 1.277.947.0 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: Oct 11,2018 04:18 PM UTC

New definitions
Trojan:O97M/Obfuse.Hsevere

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