Change log for definition version 1.271.878.0 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 (1.271.1162.0), 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: Jul 12,2018 11:58 AM UTC

New definitions


No new threats have been identified in this definition update.

Updated definitions

BrowserModifier:Win32/Diplugemhigh
BrowserModifier:Win32/Foxiebrohigh
HackTool:PowerShell/PsAttack.Ahigh
HackTool:Win32/AutoKMShigh
HackTool:Win32/BrowserPassviewhigh
HackTool:Win32/ChromePasshigh
HackTool:Win32/Rabased!rfnhigh
HackTool:Win32/Virledi!rfnhigh
HackTool:Win32/Virledi.Ahigh
SoftwareBundler:MSIL/Wizremhigh
SoftwareBundler:Win32/Dlhelperhigh
TrojanDownloader:Win32/Adloadhigh
TrojanDownloader:Win32/Adload!rfnhigh
Backdoor:Linux/Mirai!rfnsevere
Backdoor:MSIL/Bladabindi!rfnsevere
Backdoor:MSIL/Noancooe!rfnsevere
Backdoor:MSIL/Noancooe.Asevere
Backdoor:Win32/Berbew!rfnsevere
Backdoor:Win32/Dodiw.Asevere
Backdoor:Win32/Etumbot!rfnsevere
Backdoor:Win32/Hupigon!rfnsevere
Backdoor:Win32/Kirts.Asevere
Backdoor:Win32/Rescoms.Bsevere
Backdoor:Win32/SdBot!rfnsevere
Backdoor:Win32/Simbotsevere
Backdoor:Win32/Tofsee!rfnsevere
Backdoor:Win32/Xiclog.Asevere
Backdoor:Win32/Xtrat.ACsevere
Backdoor:Win32/Zegostsevere
Backdoor:Win32/Zegost!rfnsevere
Backdoor:Win64/Drixed!rfnsevere
DDoS:Linux/Lightaidra!rfnsevere
Exploit:HTML/IframeRef!rfnsevere
Exploit:Win32/Shellcodesevere
PWS:Win32/Enterak!rfnsevere
PWS:Win32/QQThief!rfnsevere
PWS:Win32/VBsevere
PWS:Win32/Zbot!GOAsevere
PWS:Win32/Zbot!rfnsevere
Ransom:Win32/GandCrab!rfnsevere
Ransom:Win32/GandCrab.AEsevere
Ransom:Win32/GandCrab.Esevere
Ransom:Win32/Genasomsevere
Ransom:Win32/Petya!rfnsevere
SupportScam:JS/TechBrolo!rfnsevere
Trojan:HTML/Brocoiner!rfnsevere
Trojan:JS/HideLink!rfnsevere
Trojan:JS/Redirector!rfnsevere
Trojan:JS/WebHijack!rfnsevere
Trojan:MSIL/BitcoinMiner.Asevere
Trojan:MSIL/CryptInject!rfnsevere
Trojan:MSIL/Ribaj!rfnsevere
Trojan:MSIL/Starter.Fsevere
Trojan:MSIL/Upadter.Asevere
Trojan:MSIL/Wirzemro.Asevere
Trojan:Win32/Asacky!rfnsevere
Trojan:Win32/Autorun!rfnsevere
Trojan:Win32/Bancteian!rfnsevere
Trojan:Win32/Bluteal!rfnsevere
Trojan:Win32/Ceatrg.Asevere
Trojan:Win32/CoinMiner!bitsevere
Trojan:Win32/CoinMiner!rfnsevere
Trojan:Win32/CoinMiner.AC!bitsevere
Trojan:Win32/CoinMiner.DAsevere
Trojan:Win32/Dibizor!rfnsevere
Trojan:Win32/Dynamer!rfnsevere
Trojan:Win32/Emotet.AC!bitsevere
Trojan:Win32/Eqtonex!rfnsevere
Trojan:Win32/Gandcrab.AFsevere
Trojan:Win32/Genasep.Asevere
Trojan:Win32/Killav!rfnsevere
Trojan:Win32/Occamy.Bsevere
Trojan:Win32/Occamy.Csevere
Trojan:Win32/Pynamer.A!acsevere
Trojan:Win32/Pynamer.B!acsevere
Trojan:Win32/Ramnit!rfnsevere
Trojan:Win32/Ronohu.Asevere
Trojan:Win32/Salgorea!rfnsevere
Trojan:Win32/Salgorea.C!dhasevere
Trojan:Win32/Simbot!rfnsevere
Trojan:Win32/Skeeyah.A!bitsevere
Trojan:Win32/Skeeyah.A!rfnsevere
Trojan:Win32/Smasarch.Csevere
Trojan:Win32/Starter.Psevere
Trojan:Win32/Startpage!rfnsevere
Trojan:Win32/Suloc.Asevere
Trojan:Win32/Swrort!rfnsevere
Trojan:Win32/Tepely!rfnsevere
Trojan:Win32/Tiggre!rfnsevere
Trojan:Win32/Tinba!rfnsevere
Trojan:Win32/Tinba.Fsevere
Trojan:Win32/Tonmyesevere
Trojan:Win32/Tonmye!rfnsevere
Trojan:Win32/Totbrick.Hsevere
Trojan:Win32/VBsevere
Trojan:Win32/Vflooder!rfnsevere
Trojan:Win32/Vibem!rfnsevere
Trojan:Win32/Zonsterarch.BWsevere
Trojan:Win32/Zpevdo!rfnsevere
Trojan:Win64/Alureon!rfnsevere
Trojan:Win64/Meterpreter!rfnsevere
Trojan:Win64/Meterpreter.Asevere
Trojan:Win64/Wdfload!rfnsevere
TrojanClicker:JS/Faceliker!rfnsevere
TrojanDownloader:HTML/Adodbsevere
TrojanDownloader:JS/FakejQuery!rfnsevere
TrojanDownloader:JS/Nemucod!rfnsevere
TrojanDownloader:O97M/Donoff!rfnsevere
TrojanDownloader:O97M/Dornoe.A!amssevere
TrojanDownloader:O97M/Dornoe.B!amssevere
TrojanDownloader:Script/Nemucod.JABsevere
TrojanDownloader:VBS/Donoffsevere
TrojanDownloader:VBS/Donoff!amssevere
TrojanDownloader:Win32/Chasendi.Asevere
TrojanDownloader:Win32/Dofoil!rfnsevere
TrojanDownloader:Win32/Dofoil.ACsevere
TrojanDownloader:Win32/Farfli!rfnsevere
TrojanDownloader:Win32/Nymaim.Ksevere
TrojanDownloader:Win32/Regonidsevere
TrojanDownloader:Win32/Tinub.Asevere
TrojanDownloader:Win32/Tugspay.Asevere
TrojanDownloader:Win32/Waledac.ALsevere
TrojanDownloader:Win32/Zbot.Dsevere
TrojanDropper:MSIL/Etenudu.A!bitsevere
TrojanDropper:Win32/Dexel!rfnsevere
TrojanDropper:Win32/Gepyssevere
TrojanDropper:Win32/Injector.Dsevere
TrojanProxy:Win32/Bunitu!rfnsevere
TrojanProxy:Win32/Bunitu.Q!bitsevere
TrojanSpy:MSIL/Plimrost.Bsevere
TrojanSpy:Win32/Nivdortsevere
VirTool:MSIL/Injectorsevere
VirTool:Win32/CeeInjectsevere
VirTool:Win32/DelfInjectsevere
VirTool:Win32/Dofoil!rfnsevere
VirTool:Win32/Injectorsevere
VirTool:Win32/ModTool!rfnsevere
VirTool:Win32/VBInjectsevere
Worm:MSIL/Necast.Jsevere
Worm:Win32/Ainslot!rfnsevere
Worm:Win32/Ainslot.Asevere
Worm:Win32/Autorunsevere
Worm:Win32/Brontok!rfnsevere
Worm:Win32/Bruhorn.Bsevere
Worm:Win32/Fadok!rfnsevere
Worm:Win32/Gamarue!rfnsevere
Worm:Win32/Ludbaruma!rfnsevere
Worm:Win32/Mofksyssevere
Worm:Win32/Mofksys!rfnsevere
Worm:Win32/Mydoom!rfnsevere
Worm:Win32/Nuqel!rfnsevere
Worm:Win32/Poswauto.Asevere
Worm:Win32/Rebhipsevere