Change logs for security intelligence update version 1.447.40.0

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

3/27/2026 7:32:36 PM

Added threat detections

Name	Severity
Phish:HTML/FakeLogin.DUW!MTB	severe
Trojan:MSIL/AsyncRAT.KKA!MTB	severe
Trojan:MSIL/Keylogger.KK!MTB	severe
Trojan:Python/NetSupportRAT!MTB	severe
Trojan:Win32/OusabanSpy.MKD!MTB	severe
Trojan:Win64/Midie.KKA!MTB	severe
Trojan:Win64/SpyAgent.CX!MTB	severe
TrojanDropper:Win64/Tedy.KK!MTB	severe

Updated threat detections

Name	Severity
Backdoor:Java/Meterpreter	severe
Backdoor:MSIL/XWormRAT!rfn	severe
Backdoor:Win64/Nukesped	severe
HackTool:PowerShell/BloodHound.G!MSR	high
HackTool:Python/Impacket!MSR	high
HackTool:Win32/Activator	high
HackTool:Win32/Defendercontrol	high
HackTool:Win32/Malgent!MSR	high
HackTool:Win32/Patcher	high
HackTool:Win32/ProductKey.G!MSR	high
HackTool:Win32/Tnega	high
Ransom:Win64/Inc!rfn	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/LNK_DarkGate!rfn	severe
Trojan:BAT/Qakbot!rfn	severe
Trojan:MSIL/DllInject!rfn	severe
Trojan:PDF/Phish!rfn	severe
Trojan:Script/Wacatac	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Eqtonex!bit	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/GuLoader.REO!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/LummaStealer.KKB!MTB	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	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/RomCom!rfn	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/Sonoko.A!rfn	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Trickbot!rfn	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/WinLNK!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/Aotera.RVA!MTB	severe
Trojan:Win64/CoinMiner!rfn	severe
Trojan:Win64/Emotet!rfn	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/Lazy.KK!MTB	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/Midie.KK!MTB	severe
Trojan:Win64/PoolInject.KK!MTB	severe
Trojan:Win64/Revsocks!rfn	severe
Trojan:Win64/RomCom!rfn	severe
Trojan:Win64/Tedy!MTB	severe
Trojan:Win64/Vidar!MTB	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:HTML/Adodb.gen!A	severe
VirTool:Win32/NeFitler!MTB	severe
Virus:Win64/Expiro!rfn	severe
Worm:Win32/Citeary!rfn	severe