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Change logs for security intelligence update version 1.449.430.0

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

5/3/2026 1:43:03 PM

Added threat detections

Name Severity
SupportScam:Win32/Screcwon!MSR severe
Trojan:Win64/Zilla!MTB severe

Updated threat detections

Name Severity
Adware:Win32/Tnega high
Backdoor:Linux/Gafgyt!rfn severe
Backdoor:Linux/Mirai!rfn severe
Backdoor:MSIL/Bladabindi!rfn severe
Backdoor:MSIL/XWormRAT!rfn severe
Backdoor:Win32/Berbew.AA!MTB severe
Backdoor:Win32/FlyAgent!rfn severe
Backdoor:Win32/Lojax.A!dha severe
Backdoor:Win64/Coroxy!rfn severe
Backdoor:Win64/RomComLoader!rfn severe
Backdoor:Win64/SystemBC!rfn severe
Exploit:HTML/IframeRef.gen severe
Exploit:Win32/Cluffert!rfn severe
HackTool:Linux/GsNetcat.A!MTB high
HackTool:PowerShell/PowerView.A high
HackTool:Python/Impacket!MSR high
HackTool:Python/Pypykatz!MSR high
HackTool:Win32/AutoKMS!MSR high
HackTool:Win32/BrowserPassview!rfn high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Injector high
HackTool:Win32/Keygen high
HackTool:Win32/Patcher high
PWS:MSIL/Stealer!rfn severe
Ransom:MSIL/CryptoLocker.DA!MTB severe
Ransom:Win32/Filecoder!rfn severe
Ransom:Win32/Lockbit!rfn severe
Ransom:Win64/Akira!rfn severe
Ransom:Win64/Mallox!rfn severe
Ransom:Win64/Ransomhub!rfn severe
SupportScam:Win32/Screcwon!AMTB severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:AndroidOS/Multiverze!rfn severe
Trojan:HTML/Acsogenixx.MK!MTB severe
Trojan:HTML/FakeCaptcha.P!MTB severe
Trojan:HTML/Nioc!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:HTML/Redirector.MSS!MTB severe
Trojan:JS/AgentTesla.P!MTB severe
Trojan:JS/Batloader!rfn severe
Trojan:JS/Obfuse!rfn severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:JS/QuietVault!MTB severe
Trojan:JS/Ursnif!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/AgentTesla!MTB severe
Trojan:MSIL/BadJoke severe
Trojan:MSIL/FormBook.RSD!MTB severe
Trojan:MSIL/Jalapeno!rfn severe
Trojan:MSIL/Lazy.BAC!MTB severe
Trojan:MSIL/LummaC!rfn severe
Trojan:MSIL/Zilla!MTB severe
Trojan:PDF/Phish!rfn severe
Trojan:PHP/Malgent!MSR severe
Trojan:PowerShell/Agent!AMTB severe
Trojan:PowerShell/Malgent!rfn severe
Trojan:PowerShell/Pklotide.A severe
Trojan:PowerShell/Pterodo!rfn severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:Script/Multiverze!rfn severe
Trojan:Script/Obfuse severe
Trojan:VBS/GlassWorm.AG!MTB severe
Trojan:VBS/Pterodo!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:VBS/SmugVBS!rfn severe
Trojan:Win32/Agent!MSR severe
Trojan:Win32/Amadey!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Ceevee severe
Trojan:Win32/Cerber!rfn severe
Trojan:Win32/Chopper.A severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Dynamer!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/GuLoader!rfn severe
Trojan:Win32/GuLoader.RBT!MTB severe
Trojan:Win32/IcedIDLNK!rfn severe
Trojan:Win32/Injector!rfn severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Latrodectus!rfn severe
Trojan:Win32/Lazy!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/LummaStealer severe
Trojan:Win32/Lycaon!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!AMTB severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/Malgent!MTB severe
Trojan:Win32/MalLoader!rfn severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Oyester!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Pterodo!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Skeeyah.A!MTB severe
Trojan:Win32/Starter!rfn severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tedy!MTB severe
Trojan:Win32/Tiggre!rfn severe
Trojan:Win32/Vindor!rfn severe
Trojan:Win32/WinLNK.HFJ!MTB severe
Trojan:Win32/XWorm!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win32/Zusy.KK!MTB severe
Trojan:Win64/Artemis!rfn severe
Trojan:Win64/BlackMoon!rfn severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/CoinMiner!rfn severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/EmotetPacker!rfn severe
Trojan:Win64/ExamCheat.B severe
Trojan:Win64/Filecoder!rfn severe
Trojan:Win64/IcedID!rfn severe
Trojan:Win64/Latrodectus!rfn severe
Trojan:Win64/Lazy!MTB severe
Trojan:Win64/Maloder!rfn severe
Trojan:Win64/MuddyWater!MTB severe
Trojan:Win64/Oyster!rfn severe
Trojan:Win64/Qakbot!rfn severe
Trojan:Win64/ScreenConnect.A!AMTB severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/Zusy!MTB severe
TrojanClicker:Win32/Doplik.Q severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:Linux/ShellAgnt!MSR severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:O97M/EncDoc.BK!MTB severe
TrojanDownloader:O97M/Qakbot!rfn severe
TrojanDownloader:PowerShell/Obfuse!rfn severe
TrojanDownloader:SWF/Esaprof!rfn severe
TrojanDownloader:Win32/Andromeda.SIBB!MTB severe
TrojanDownloader:Win32/Andromeda.SIBC!MTB severe
TrojanDownloader:Win32/Snojan.BB!MTB severe
TrojanDropper:PowerShell/Doprimm!rfn severe
TrojanSpy:Win32/Nivdort!rfn severe
VirTool:Win32/DelfInject!rfn severe
VirTool:WinNT/Rootkitdrv!rfn severe
Worm:Win32/Citeary!rfn severe
Worm:Win32/Mofksys!rfn severe