Change logs for security intelligence update version 1.449.636.0

This page lists newly added and updated threat detections included in security intelligence updates for Microsoft Defender Antivirus and other Microsoft antimalware. If you don’t find the latest security intelligence update version in the selector below, please refresh this page or let us know us know through the feedback smiley.

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Security intelligence update version

Released on

5/15/2026 6:51:40 PM

Added threat detections

Name	Severity
Backdoor:Win64/PulsarRat.MKA!MTB	severe
HackTool:MSIL/Quasar.SN!MTB	high
Phish:HTML/FakeLogin.RVI!MTB	severe
Ransom:Win32/FileCryptor.SN!MTB	severe
Ransom:Win32/Haperlock.SN!MTB	severe
Ransom:Win32/RagnarLocker.SN!MTB	severe
Ransom:Win32/Xorist.SN!MTB	severe
Ransom:Win64/LockFile.PAHZ!MTB	severe
Ransom:Win64/LockFile.PAIA!MTB	severe
Ransom:Win64/LockScreen.PGBD!MTB	severe
Trojan:HTML/Phishing.PGCG!MTB	severe
Trojan:HTML/Stealer.PGBY!MTB	severe
Trojan:MSIL/Artemis.SNB!MTB	severe
Trojan:MSIL/Misc.SN!MTB	severe
Trojan:Python/Lockscreen!MTB	severe
Trojan:VBS/AsyncRAT.KPT!MTB	severe
Trojan:VBS/Obfuse.KEF!MTB	severe
Trojan:Win32/Androm.SKK!MTB	severe
Trojan:Win32/GateKeeper.LVG!MTB	severe
Trojan:Win32/LummaStealer.KAN!MTB	severe
Trojan:Win32/Nekark.SNA!MTB	severe
Trojan:Win32/Phorpiex.RMX!MTB	severe
Trojan:Win32/ValleyRat.AVR!MTB	severe
Trojan:Win64/AdaptixC2.DMX!MTB	severe
Trojan:Win64/BadJoke.ND!MTB	severe
Trojan:Win64/DLLHijack.NWA!MTB	severe
Trojan:Win64/DLLHijack.NWD!MTB	severe
Trojan:Win64/Lazy.AHH!MTB	severe
Trojan:Win64/Lazy.CPIM!MTB	severe
Trojan:Win64/Lazy.MKO!MTB	severe
Trojan:Win64/PyphKatz!MTB	severe
Trojan:Win64/RShell.AHA!MTB	severe
Trojan:Win64/ShellcodeRunner.AHH!MTB	severe
Trojan:Win64/ShellcodeRunner.ASRU!MTB	severe
Trojan:Win64/SilverFox.ASF!MTB	severe
Trojan:Win64/Tedy.CAH!MTB	severe
Trojan:Win64/Tedy.CPIM!MTB	severe
Trojan:Win64/Tedy.PGTB!MTB	severe
Trojan:Win64/ValleyRAT.NV!MTB	severe
TrojanDownloader:Win64/KongTuke.C!MTB	severe
TrojanDropper:Win64/XMRig!AMTB	severe

Updated threat detections

Name	Severity
Adware:Win32/Tnega	high
Backdoor:Linux/Mirai!rfn	severe
Backdoor:PHP/Dirtelti.MTG	severe
Backdoor:Win32/DarkVNC!rfn	severe
BrowserModifier:Win32/MediaArena	high
Exploit:Ruby/JSShell.G!MSR	severe
HackTool:MSIL/SharpHound!rfn	high
HackTool:PowerShell/Malgent!MSR	high
HackTool:PowerShell/PowerView.A	high
HackTool:Win32/Activator!MTB	high
HackTool:Win32/AutoKMS	high
HackTool:Win32/AutoKMS!MSR	high
HackTool:Win32/crack	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/IEPassview	high
HackTool:Win32/Keygen	high
HackTool:Win32/Keygen!MTB	high
HackTool:Win32/Mailpassview!rfn	high
HackTool:Win32/Patcher	high
HackTool:Win32/Unlocker!MTB	high
HackTool:Win64/Mimikatz!rfn	high
Misleading:Win32/Lodi	high
Misleading:Win32/Malgent!AMTB	high
Ransom:Linux/ESXiArgs.B!MTB	severe
Ransom:Linux/GunraCrypt!rfn	severe
Ransom:Win32/BlackCat!rfn	severe
Ransom:Win32/Clop!rfn	severe
Ransom:Win32/Filecoder!rfn	severe
Ransom:Win32/Nokonoko!rfn	severe
Ransom:Win32/Phobos!rfn	severe
Ransom:Win64/Azov.psyA!MTB	severe
Ransom:Win64/BuddyRansmCrypt!rfn	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/LNK_DarkGate!rfn	severe
Trojan:BAT/Malscript!MTB	severe
Trojan:BAT/Qakbot!rfn	severe
Trojan:HTML/FakeCaptcha!AMTB	severe
Trojan:HTML/FakeCaptcha.P!MTB	severe
Trojan:HTML/Obfuse!rfn	severe
Trojan:HTML/Pterodo!rfn	severe
Trojan:HTML/Qakbot!rfn	severe
Trojan:HTML/Redirector.BAJ!MTB	severe
Trojan:HTML/Redirector.MSS!MTB	severe
Trojan:HTML/Redirector.SSF!MTB	severe
Trojan:HTML/Redirector.VCT!MTB	severe
Trojan:HTML/Redirector.VVZ!MTB	severe
Trojan:HTML/Redirector.XXZ!MTB	severe
Trojan:HTML/ScrInject.SJKP!MTB	severe
Trojan:HTML/ScrInject.SMW!MTB	severe
Trojan:JS/FormBook.SI!MTB	severe
Trojan:JS/Obfuse!rfn	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:JS/Redirector.AXUB!MTB	severe
Trojan:JS/Redirector.TSE!MTB	severe
Trojan:JS/ShaiWorm.DV!MTB	severe
Trojan:Linux/Gafgyt!MSR	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:MacOS/Multiverze!rfn	severe
Trojan:MSIL/CryptInject!rfn	severe
Trojan:MSIL/Injectgen.MA!MTB	severe
Trojan:MSIL/Injuke!rfn	severe
Trojan:MSIL/Jalapeno!MTB	severe
Trojan:MSIL/LummaStealer!rfn	severe
Trojan:MSIL/Malgent!MSR	severe
Trojan:MSIL/Masslogger.AMS!MTB	severe
Trojan:MSIL/Tedy!rfn	severe
Trojan:MSIL/Zusy.KK!MTB	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PowerShell/Agent!MSR	severe
Trojan:PowerShell/Boxter!MSR	severe
Trojan:PowerShell/Boxter.AIUB!MTB	severe
Trojan:PowerShell/Boxter.HJD!MTB	severe
Trojan:PowerShell/Obfuse.PW!MTB	severe
Trojan:PowerShell/Powersploit.J	severe
Trojan:PowerShell/Pterodo!rfn	severe
Trojan:Python/Bobik.EB!MTB	severe
Trojan:Python/Nuitka!MTB	severe
Trojan:Python/ReverseShell!MTB	severe
Trojan:Script/Malgent!MSR	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Agent!AMTB	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/Obfuse!rfn	severe
Trojan:VBS/Pterodo!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/Acll!rfn	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/Batpenr.A!MTB	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Cerber!rfn	severe
Trojan:Win32/Copak.KAV!MTB	severe
Trojan:Win32/Doina.MBHT!MTB	severe
Trojan:Win32/DSSDetection	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/Fareit.VB!MTB	severe
Trojan:Win32/Glupteba!rfn	severe
Trojan:Win32/GuLoader.KH!MTB	severe
Trojan:Win32/HijackLoader!MTB	severe
Trojan:Win32/InjectorCrypt!rfn	severe
Trojan:Win32/IRCBot.EN!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/Madokwa!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!AMTB	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/MereTam!rfn	severe
Trojan:Win32/PhishLeonem!rfn	severe
Trojan:Win32/Pomal!rfn	severe
Trojan:Win32/Qadars!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/Qwexlafiba!rfn	severe
Trojan:Win32/Ravartar!rfn	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/ShortSeek!rfn	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/SystemBC!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/ValleyRAT!rfn	severe
Trojan:Win32/VBClone.GTT!MTB	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/Wimepud!rfn	severe
Trojan:Win32/WinLNK!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Zenpack!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win32/Zusy.BL!MTB	severe
Trojan:Win32/Zusy.HNC!MTB	severe
Trojan:Win32/Zusy.KK!MTB	severe
Trojan:Win64/BazaarLoader!rfn	severe
Trojan:Win64/BlunderBlight!rfn	severe
Trojan:Win64/CobaltStrike!rfn	severe
Trojan:Win64/CoinMiner!rfn	severe
Trojan:Win64/CryptInject!rfn	severe
Trojan:Win64/DLLHijack!MTB	severe
Trojan:Win64/GreedyBear.NG!MTB	severe
Trojan:Win64/Havoc.KK!MTB	severe
Trojan:Win64/HijackLoader!MTB	severe
Trojan:Win64/HijackLoader.ARAC!MTB	severe
Trojan:Win64/IcedID!rfn	severe
Trojan:Win64/Injector!MTB	severe
Trojan:Win64/Khalesi!MTB	severe
Trojan:Win64/Lazy.CPIM!MTB	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/Malgent!MTB	severe
Trojan:Win64/Oyster.Z!MTB	severe
Trojan:Win64/Rhadamanthys.RH!MTB	severe
Trojan:Win64/Stealer.NVH!MTB	severe
Trojan:Win64/SystemBC!MTB	severe
Trojan:Win64/Tedy!MTB	severe
Trojan:Win64/Tedy.KKC!MTB	severe
Trojan:Win64/Xworm.PGXM!MTB	severe
Trojan:Win64/ZLoaderE!rfn	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:HTML/Obfuse!MTB	severe
TrojanDownloader:JS/IcedID!rfn	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDownloader:O97M/Emotet!rfn	severe
TrojanDownloader:Win32/Andromeda.SIBB!MTB	severe
TrojanDownloader:Win32/Begseabug!rfn	severe
TrojanDownloader:Win32/ShortSeek!rfn	severe
VirTool:PHP/Remeshelsz.A!AMTB	severe
VirTool:Win32/Kekeo.A!MTB	severe
VirTool:WinNT/Rootkitdrv!rfn	severe
Worm:Win32/Brontok!rfn	severe