Change log for definition version 1.259.37.0 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 (1.273.212.0), 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: Dec 07,2017 07:05 PM UTC

New definitions

Updated definitions

Adware:Win32/Hebogohigh
Dialer:Win32/Adialerhigh
HackTool:MSIL/Boilod!rfnhigh
SoftwareBundler:Win32/Fourthremhigh
SoftwareBundler:Win32/Techsnabhigh
Trojan:Win32/Startpagehigh
TrojanDownloader:Win32/Adload!rfnhigh
HackTool:Win32/AutoKMS!rfnmoderate
HackTool:Win32/Keygen!rfnmoderate
Backdoor:ASP/Ace!rfnsevere
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe.Csevere
Backdoor:Win32/Beastdoor!rfnsevere
Backdoor:Win32/Bifrosesevere
Backdoor:Win32/Cycbot.Bsevere
Backdoor:Win32/Kelihos.Fsevere
Backdoor:Win32/NetWiredRC!rfnsevere
Backdoor:Win32/SdBot!rfnsevere
Backdoor:Win32/Tarctox!rfnsevere
Backdoor:Win32/Zegostsevere
DDoS:Win32/Nitol!rfnsevere
Exploit:HTML/IframeRef!rfnsevere
Exploit:Win32/CVE-2012-0158!rfnsevere
PWS:MSIL/Mintluks!rfnsevere
PWS:MSIL/Mintluks.Asevere
PWS:Win32/Fareitsevere
PWS:Win32/Lolyda.BFsevere
PWS:Win32/QQThief!rfnsevere
PWS:Win32/Sinowal.gen!Ysevere
Ransom:AndroidOS/LockScreen!rfnsevere
Trojan:HTML/Redirector!rfnsevere
Trojan:Java/Jaraut.Asevere
Trojan:JS/Iframeinject!rfnsevere
Trojan:JS/Redirector!rfnsevere
Trojan:MSIL/Apehedisevere
Trojan:MSIL/CoinMiner!rfnsevere
Trojan:MSIL/Eskimo!rfnsevere
Trojan:Win32/Bicone!rfnsevere
Trojan:Win32/Bicone.Bsevere
Trojan:Win32/Genasep.Asevere
Trojan:Win32/Goabeny!rfnsevere
Trojan:Win32/Injeber.A!bitsevere
Trojan:Win32/Krilog.Asevere
Trojan:Win32/Pizwin!rfnsevere
Trojan:Win32/Ronohu.Asevere
Trojan:Win32/Salgorea!rfnsevere
Trojan:Win32/Startpage!rfnsevere
Trojan:Win32/Suloc.Asevere
Trojan:Win32/Tonmyesevere
Trojan:Win32/Zonsterarch.BWsevere
TrojanDownloader:Java/Banload!rfnsevere
TrojanDownloader:O97M/Donoffsevere
TrojanDownloader:O97M/Donoff!rfnsevere
TrojanDownloader:Win32/Banload!rfnsevere
TrojanDownloader:Win32/Brantall!rfnsevere
TrojanDownloader:Win32/Dofoil!rfnsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Harnig!rfnsevere
TrojanDownloader:Win32/Nymaim!rfnsevere
TrojanDownloader:Win32/Renos!rfnsevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDropper:Win32/Agentsevere
TrojanDropper:Win32/Goriadu!rfnsevere
TrojanDropper:Win32/Sirefef.Bsevere
TrojanSpy:MSIL/Omaneat!rfnsevere
TrojanSpy:Win32/Banker!rfnsevere
TrojanSpy:Win32/Keylogger!rfnsevere
VirTool:MSIL/Injectorsevere
VirTool:MSIL/Subti.Nsevere
Worm:Win32/Conficker!rfnsevere
Worm:Win32/Dorkbot!rfnsevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Mira!rfnsevere
Worm:Win32/Moarider!rfnsevere
Worm:Win32/Rebhipsevere
Worm:Win32/Rebhip!rfnsevere