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Change logs for security intelligence update version 1.447.168.0

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

4/4/2026 8:52:10 PM

Added threat detections

Name Severity
Backdoor:Python/Malscript!MSR severe

Updated threat detections

Name Severity
Adware:JS/BrowserHijacker!AMTB high
Backdoor:MSIL/Crysen!rfn severe
Backdoor:MSIL/XWormRAT!rfn severe
Backdoor:Win32/Fynloski!rfn severe
Behavior:Win32/Mamadut.DC severe
BrowserModifier:Win32/MediaArena high
HackTool:Python/Impacket!MSR high
HackTool:Python/RemoteShell!MSR high
HackTool:Win32/Agent high
HackTool:Win32/AutoKMS!MTB high
HackTool:Win32/BrowserPassview!rfn high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Mailpassview!rfn high
HackTool:Win32/Malgent!MSR high
HackTool:Win32/MeltScreen!MTB high
HackTool:Win32/Tnega high
HackTool:Win64/Meterpreter high
HackTool:Win64/RDPWrap!MTB high
Misleading:Win32/Lodi high
Ransom:Win32/BastaLoader!rfn severe
Ransom:Win32/NoEscape!rfn severe
Ransom:Win32/PowerRanges!rfn severe
Ransom:Win64/Akira!rfn severe
Ransom:Win64/GunraCrypt!rfn severe
Ransom:Win64/Prince!rfn severe
Ransom:Win64/Rook!rfn severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:HTML/Phish!rfn severe
Trojan:HTML/Phish.SXK!MTB severe
Trojan:HTML/Redirector!rfn severe
Trojan:HTML/Redirector.AH!MTB severe
Trojan:HTML/Redirector.SEM!MTB severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:MSIL/AgentTesla!rfn severe
Trojan:MSIL/Injector.AH!MTB severe
Trojan:MSIL/Lazy!rfn severe
Trojan:MSIL/Polazert!rfn severe
Trojan:MSIL/PureLogStealer!rfn severe
Trojan:MSIL/QuasarRat.ND!MTB severe
Trojan:MSIL/Snakekeylogger!rfn severe
Trojan:O97M/DDownloader!rfn severe
Trojan:PowerShell/Obfuse!MTB severe
Trojan:Python/Multiverze!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:Win32/Alevaul!MSR severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/Bumblebee!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Ceevee severe
Trojan:Win32/Cerber!rfn severe
Trojan:Win32/CommandAndControl!rfn severe
Trojan:Win32/CoreWarrior.DA!MTB severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Eqtonex!bit severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Farfli!rfn severe
Trojan:Win32/FormBook!rfn severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/KillAv!rfn severe
Trojan:Win32/Kryptik severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/LokiBot!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!AMTB severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/NSISInject!rfn severe
Trojan:Win32/PhishLeonem!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/ShortSeek!rfn severe
Trojan:Win32/Strab!rfn severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win64/AVTamper!rfn severe
Trojan:Win64/BumbleBee!rfn severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/CoinMiner!rfn severe
Trojan:Win64/Emotetcrypt!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/OyesterLoader!rfn severe
Trojan:Win64/Oyster!rfn severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/Vidar.AS!AMTB severe
Trojan:Win64/Vidar.AT!AMTB severe
TrojanClicker:Win32/Doplik.Q severe
TrojanDownloader:VBS/CoinMiner severe
TrojanDownloader:Win64/BazaarLoader!rfn severe
VirTool:WinNT/Rootkitdrv!rfn severe
Worm:Win32/Mofksys!rfn severe