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Change logs for security intelligence update version 1.451.149.0

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

5/28/2026 7:37:30 PM

Added threat detections

Name Severity
Trojan:HTML/Cryxos.PGBX!MTB severe
Trojan:HTML/Obfuscator.PGBQ!MTB severe
Trojan:HTML/Obfuscator.PGCE!MTB severe
Trojan:HTML/Phishing.PGBS!MTB severe
Trojan:HTML/Redirector.PGBR!MTB severe
Trojan:HTML/Redirector.PGBV!MTB severe
Trojan:HTML/Redirector.PGBW!MTB severe
Trojan:HTML/Redirector.PGCF!MTB severe
Trojan:HTML/ScrInject.ZRC!MTB severe
Trojan:MSIL/Barys.BAB!MTB severe
Trojan:MSIL/Jalapeno.PGL!MTB severe
Trojan:MSIL/Tedy.PGK!MTB severe
Trojan:PowerShell/Boxter.PGCD!MTB severe
Trojan:PowerShell/SLoad.SLSE!MTB severe
Trojan:Script/Stealer.HAE!MTB severe
Trojan:VBS/PWDStealer.VGY!MTB severe
Trojan:VBS/SAgent!MTB severe
Trojan:Win32/ACRStealer.MX!MTB severe
Trojan:Win32/PonyStealer.DAH!MTB severe
Trojan:Win64/Dapato.MX!MTB severe
Trojan:Win64/Injuke.MX!MTB severe
Trojan:Win64/KeyLogger.KK!MTB severe
Trojan:Win64/Lotok.MX!MTB severe
Trojan:Win64/ShellcodeRunner.PAHK!MTB severe
Trojan:Win64/ValleyRAT.MX!MTB severe

Updated threat detections

Name Severity
Backdoor:Java/Dirtelti.A severe
BrowserModifier:MSIL/MediaArena!MTB high
BrowserModifier:Win32/Shafmia high
HackTool:Python/Impacket!MSR high
HackTool:Python/Impacket.V high
HackTool:Python/Pypykatz.SA high
HackTool:Win32/Activator high
HackTool:Win32/Agent high
HackTool:Win32/crack high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Mailpassview!rfn high
HackTool:Win32/Patcher high
Ransom:Win32/CylanceLoader!rfn severe
Ransom:Win64/Azov.psyA!MTB severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Obfuse!MTB severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/Nioc!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:HTML/Redirector.BC!MTB severe
Trojan:HTML/Stealer.PGBY!MTB severe
Trojan:JS/Redirector.GPC!MTB severe
Trojan:JS/Redirector.HNAA!MTB severe
Trojan:Linux/Multiverze!rfn severe
Trojan:Linux/SAgnt!MSR severe
Trojan:MSIL/AsyncRat!rfn severe
Trojan:MSIL/BadJoke severe
Trojan:MSIL/Barys.ARS!MTB severe
Trojan:MSIL/Disco.KKA!MTB severe
Trojan:MSIL/Redline!rfn severe
Trojan:MSIL/XWormRAT!rfn severe
Trojan:O97M/DDownloader!rfn severe
Trojan:PowerShell/Boxter.AE!AMTB severe
Trojan:PowerShell/GuLoader.PA!MTB severe
Trojan:PowerShell/Malgent!rfn severe
Trojan:PowerShell/Pklotide.A severe
Trojan:PowerShell/Pterodo!rfn severe
Trojan:PowerShell/XWorm.SLSD!MTB severe
Trojan:Python/Bobik.EB!MTB severe
Trojan:Script/Downloader!MSR severe
Trojan:Script/Malgent!MSR severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Obfuse!rfn severe
Trojan:VBS/Obfuse.BAE!MTB severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Acll!rfn severe
Trojan:Win32/Agent!MSR severe
Trojan:Win32/Androm.BAS!MTB severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/CoinMiner!rfn severe
Trojan:Win32/Coroxy!rfn severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Doina.MBHT!MTB severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Fareit.VB!MTB severe
Trojan:Win32/Fauppod!rfn severe
Trojan:Win32/Flystudio!MTB severe
Trojan:Win32/FlyStudio.PGC!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!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/OffLoader!MTB severe
Trojan:Win32/PhishLeonem!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Primarypass!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Salgorea.C!MTB severe
Trojan:Win32/Salgorea.SLWO!MTB severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tiggre!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win64/Aotera.MSX!MTB severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/CobaltStrike.PAB!MTB severe
Trojan:Win64/CoinMiner!rfn severe
Trojan:Win64/Convagent.MX!MTB severe
Trojan:Win64/Coroxy!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/IcedID!rfn severe
Trojan:Win64/Latrodectus!rfn severe
Trojan:Win64/Staser.LMA!MTB severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/XMRig.PA!MTB severe
TrojanClicker:Win32/Doplik.Q severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:MSIL/Tnega severe
TrojanDownloader:MSIL/Zilla.SX!MTB severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:Win32/Citeary!rfn severe
TrojanDownloader:Win32/Fragtor.ARAZ!MTB severe
TrojanDropper:Win32/Muldrop.V!MTB severe
TrojanDropper:Win64/Tedy!MTB severe
VirTool:Java/Meterpreter.A severe
VirTool:Win32/Sliver!rfn severe
Worm:Win32/Ganelp.AF!MTB severe