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Change logs for security intelligence update version 1.449.631.0

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

5/15/2026 12:41:10 PM

Added threat detections

Name Severity
Phish:HTML/FakeLogin.DTP!MTB severe
Trojan:AndroidOS/Hiddad!AMTB severe
Trojan:Python/ModeloRAT.VGX!MTB severe
Trojan:VBS/GuLoader.SPO!MTB severe
Trojan:Win32/GateKeeper.LVM!MTB severe
Trojan:Win64/RogueDaemon!MSR severe
Trojan:Win64/Xworm.PGXM!MTB severe

Updated threat detections

Name Severity
Backdoor:MacOS_X/NetWiredRC.A severe
Backdoor:MSIL/WebShell.KK!MTB severe
Backdoor:PHP/ShellAttckPP.A severe
Behavior:MacOS/SuspOsascriptExec.E severe
BrowserModifier:MSIL/MediaArena high
BrowserModifier:Win32/Shafmia high
HackTool:Win32/Ntscan high
HackTool:Win64/Crack!MTB high
Phish:PDF/FakeRobot.RV!MTB severe
Ransom:Win32/BlackCat!rfn severe
Ransom:Win32/Gocrypt!rfn severe
Ransom:Win32/LynxCrypt!rfn severe
Ransom:Win64/Funksec.GA!MTB severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/FakeCaptcha.P!MTB severe
Trojan:HTML/Qakbot!rfn severe
Trojan:HTML/Redirector.MSS!MTB severe
Trojan:HTML/Redirector.SSF!MTB severe
Trojan:HTML/Redirector.VVZ!MTB severe
Trojan:HTML/Redirector.XXZ!MTB severe
Trojan:JS/Redirector.ACT!MTB severe
Trojan:Linux/Gafgyt!MSR severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/Jalapeno!rfn severe
Trojan:MSIL/TurtleLoader!rfn severe
Trojan:MSIL/Umbral!rfn severe
Trojan:PDF/Phish!rfn severe
Trojan:PDF/Ursnif!rfn severe
Trojan:PowerShell/Boxter.AIUB!MTB severe
Trojan:PowerShell/Boxter.HJD!MTB severe
Trojan:Python/Multiverze!rfn severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/Guloader!MTB severe
Trojan:VBS/Pterodo!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Acll!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Cerber!rfn severe
Trojan:Win32/Copak.GPX!MTB severe
Trojan:Win32/CryptInject!rfn severe
Trojan:Win32/Doina.MBHT!MTB severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Fareit.VB!MTB severe
Trojan:Win32/Farfli.KK!MTB severe
Trojan:Win32/FlyStudio.PGC!MTB severe
Trojan:Win32/Glupteba!rfn severe
Trojan:Win32/Injector.RAQ!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/LummaStealer severe
Trojan:Win32/Malagent severe
Trojan:Win32/Malgent severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/PhishLeonem!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Salgorea.SLWO!MTB severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Swisyn.ADA!MTB severe
Trojan:Win32/Trec!rfn severe
Trojan:Win32/VBClone.TAAA!MTB severe
Trojan:Win32/VMProtect!MTB severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Zbot.HBAI!MTB severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win32/Zusy!MTB severe
Trojan:Win32/Zusy.BL!MTB severe
Trojan:Win32/Zusy.KK!MTB severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/CoinMiner!rfn severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/Delf!rfn severe
Trojan:Win64/Donut!rfn severe
Trojan:Win64/Emotetcrypt!rfn severe
Trojan:Win64/IcedID!rfn severe
Trojan:Win64/SpyLoader!rfn severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/Vidar!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:Win32/Malgent!MSR severe
TrojanDownloader:Win32/Snojan.BB!MTB severe
TrojanDropper:PowerShell/Doprimm!rfn severe
TrojanDropper:Win64/Malgent!MSR severe
VirTool:Win32/Injector severe
VirTool:Win32/Sliver!rfn severe