Change logs for security intelligence update version 1.445.179.0

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

2/21/2026 6:50:13 PM

Added threat detections

No new threat detections added in selected update

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/Quasar.GG!MTB	severe
Backdoor:PHP/Ecsysass	severe
Backdoor:PowerShell/CryptedLoader!rfn	severe
Backdoor:Win64/BruteRatel!rfn	severe
Exploit:Perl/CVE-2010-0738	severe
Exploit:PHP/Webshell!AMTB	severe
Exploit:VBS/Vigorf.A	severe
HackTool:Linux/PthToolkitGen.ZZ	high
HackTool:PowerShell/BloodHound	high
HackTool:Python/Impacket!MSR	high
HackTool:Python/Multiverze	high
HackTool:Win32/Agent	high
HackTool:Win32/AutoKMS	high
HackTool:Win32/crack	high
HackTool:Win32/FRProxy	high
HackTool:Win32/Incognito	high
HackTool:Win32/Keygen	high
HackTool:Win32/Keygen!MTB	high
HackTool:Win32/Malgent!MSR	high
HackTool:Win32/Patcher	high
HackTool:Win32/Patcher!MTB	high
HackTool:Win64/KMSAuto!MTB	high
Misleading:Linux/FRP.B!MTB	high
Program:Win32/Uwamson.A!rfn	high
PWS:Win32/Prast!rts	severe
Ransom:PowerShell/Roduk	severe
Ransom:Win32/DragonForce!rfn	severe
SupportScam:Win32/Screwon!AMTB	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:HTML/EtherHide.HAB!MTB	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:JS/Redirector.ATKB!MTB	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:MSIL/Diztakun.AMEB!MTB	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PDF/Phish!rfn	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/GuLoader.SNY!MTB	severe
Trojan:VBS/Obfuse!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/Acll!rfn	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Ceevee	severe
Trojan:Win32/CobaltStrike!rfn	severe
Trojan:Win32/CryptInject.BT!MTB	severe
Trojan:Win32/CryptInject.SN!MTB	severe
Trojan:Win32/DllInject!rfn	severe
Trojan:Win32/DSSDetection	severe
Trojan:Win32/Dynamer!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/GuLoader.RAM!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/Malgent!rfn	severe
Trojan:Win32/MereTam!rfn	severe
Trojan:Win32/Pomal!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/ShortSeek!rfn	severe
Trojan:Win32/Skeeyah.A!rfn	severe
Trojan:Win32/StealC!rfn	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/VMProtect	severe
Trojan:Win32/Wacatac.A!rfn	severe
Trojan:Win32/WinLNK.VCC!MSR	severe
Trojan:Win32/Ymacco.AB23	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/AVTamper!rfn	severe
Trojan:Win64/BLackWidow!rfn	severe
Trojan:Win64/BumbleBee!rfn	severe
Trojan:Win64/CobaltStrike!rfn	severe
Trojan:Win64/Convagent!MTB	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/IcedID!rfn	severe
Trojan:Win64/MuddyWater!MTB	severe
Trojan:Win64/Redromun.A	severe
Trojan:Win64/Reverseshell!MTB	severe
Trojan:Win64/ZLoaderE!rfn	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDownloader:MSIL/AgentTesla!rfn	severe
TrojanDownloader:O97M/Qakbot!rfn	severe
Worm:Win32/Gamarue!rfn	severe