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Change logs for security intelligence update version 1.451.275.0

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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Released on

6/5/2026 4:35:20 AM

Added threat detections

Name Severity
Behavior:Win32/CVE-2026-45247.DA!MTB severe
Misleading:MSIL/Malgent!AMTB high
Trojan:JS/PhantomWorm.DA!MTB severe
Trojan:JS/TwilRat.DA!MTB severe
Trojan:JS/TwiRatz.ZA!MTB severe
Trojan:Win32/PixyNetLoader!AMTB severe

Updated threat detections

Name Severity
Backdoor:JS/Obfuse!AMTB severe
Backdoor:MSIL/AsyncRAT!rfn severe
Backdoor:MSIL/Nanocore!rfn severe
Backdoor:MSIL/XWormRAT!rfn severe
Backdoor:Win32/Coroxy!rfn severe
Backdoor:Win32/Remcos!rfn severe
Backdoor:Win64/PortStarter!rfn severe
Behavior:Win32/BlipSlide.FA!dha severe
Behavior:Win32/QuartzMoor!apsi severe
BrowserModifier:Win32/MediaArena high
Exploit:HTML/Shellcode.G!MSR severe
Exploit:Win32/Tudimons.A!dha severe
HackTool:PowerShell/PowerView!pz high
HackTool:Win32/Agent high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Logoloz!rfn high
HackTool:Win64/AutoKMS!MTB high
HackTool:Win64/CobaltStrike!rfn high
HackTool:Win64/Passview!MSR high
PWS:MSIL/Stealer!rfn severe
Ransom:SH/ESXiArgs.A!MTB severe
Ransom:Win32/Embargo!rfn severe
Ransom:Win32/Lockbit.AK!ibt severe
Ransom:Win64/PrinceRansom!rfn severe
Trojan:AIMCP/PromptInjection.A!Hook severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:INF/Cmstpass!AMTB severe
Trojan:JS/Obfuse!MSR severe
Trojan:JS/Pterodo!rfn severe
Trojan:JS/Qakbot!rfn severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:JS/Redirector.ACT!MTB severe
Trojan:JS/Redirector.HNAA!MTB severe
Trojan:JS/ShaiWorm!rfn severe
Trojan:JS/ShaiWorm.DAW!MTB severe
Trojan:Linux/CoinMiner!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/Dcstl!rfn severe
Trojan:O97M/DDownloader!rfn severe
Trojan:O97M/Malgent!AMTB severe
Trojan:O97M/Qakbot!rfn severe
Trojan:PowerShell/Boxter!MSR severe
Trojan:PowerShell/Obfuse!rfn severe
Trojan:PowerShell/Pterodo!rfn severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/GuLoader.SPW!MTB severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Acll!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/AresLdr!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Casdet.A severe
Trojan:Win32/CobaltStrike!rfn severe
Trojan:Win32/CryptInject!rfn severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Fareit.VB!MTB severe
Trojan:Win32/FlyStudio.PGC!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/KoiLoader!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Remcos!rfn severe
Trojan:Win32/Salgorea.SLWO!MTB severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/ShortSeek!rfn severe
Trojan:Win32/Sirefef!rfn severe
Trojan:Win32/StealC!rfn severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tedy!MTB severe
Trojan:Win32/Tnega!MSR severe
Trojan:Win32/VBClone.GTT!MTB severe
Trojan:Win32/Vilsel.A!MTB severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win64/BruteRatel!rfn severe
Trojan:Win64/ClipBanker!rfn severe
Trojan:Win64/CobaltStrike!MTB severe
Trojan:Win64/Convagent.AHE!MTB severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/Dapato.ARR!MTB severe
Trojan:Win64/Disco!MTB severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/NightHawk!rfn severe
Trojan:Win64/Oyster!rfn severe
Trojan:Win64/ShellcodeRunner.MKC!MTB severe
Trojan:Win64/TamperedChef!rfn severe
Trojan:Win64/Tedy.BAK!MTB severe
Trojan:Win64/VulnDriver.LVK!MTB severe
Trojan:Win64/XMRig.PA!MTB severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Emotet!rfn severe
TrojanDownloader:JS/Nemucod severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:O97M/Donoff!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:PowerShell/Obfuse!rfn severe
TrojanDropper:PHP/Malgent!MSR severe
TrojanDropper:Win32/Sirefef!rfn severe
TrojanSpy:Win32/Skeeyah.A!rfn severe
VirTool:MSIL/Redthtz!rfn severe
VirTool:Win32/Sliver!rfn severe