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Change logs for security intelligence update version 1.445.172.0

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

2/21/2026 8:37:21 AM

Added threat detections

Name Severity
Trojan:Win64/Redromun.A severe
VirTool:Win32/EtherRpcConn.A severe
VirTool:Win32/EtherRpcConn.A!sms severe

Updated threat detections

Name Severity
Adware:Win32/Tnega high
Backdoor:Java/OverdriveShell!rfn severe
Backdoor:Linux/Mirai!rfn severe
Backdoor:MSIL/AsyncRAT.AA!MTB severe
Behavior:Win32/SuspAccessOnDC.A!genA severe
Exploit:O97M/CVE-2017-11882.A severe
HackTool:Win32/AutoKMS high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Patcher high
Program:Linux/Multiverze!rfn high
Ransom:Win32/Cactus!rfn severe
Ransom:Win32/Conti!rfn severe
Ransom:Win32/Flocked.YAD!MTB severe
Ransom:Win32/Inc!rfn severe
Ransom:Win32/Lockbit!rfn severe
Ransom:Win32/Play!rfn severe
Ransom:Win32/Prestige!rfn severe
Ransom:Win64/Filecoder!rfn severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:BAT/QakbotLNK!rfn severe
Trojan:HTML/Gamaredon!rfn severe
Trojan:HTML/Phish.HAV!MTB severe
Trojan:Java/Pyark.PK!MTB severe
Trojan:JS/Obfuse.ABF!MTB severe
Trojan:JS/Redirector.ABOB!MTB severe
Trojan:JS/Redirector.POK!MTB severe
Trojan:Linux/Multiverze!rfn severe
Trojan:Linux/SshBrute severe
Trojan:MSIL/Polazert!rfn severe
Trojan:PDF/Phish!atmn severe
Trojan:PowerShell/Malgent!MSR severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/Malgent!MSR severe
Trojan:VBS/Obfuse!rfn severe
Trojan:VBS/Starter.PGST!MTB severe
Trojan:VBS/XMRig.SVM!MTB severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/BlackMoon.NK!MTB severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Convagent!rfn severe
Trojan:Win32/CoreWarrior.DA!MTB severe
Trojan:Win32/CryptInject!rfn severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Dostre.CA!MTB severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Emotet!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Fareit.VB!MTB severe
Trojan:Win32/Fauppod!rfn severe
Trojan:Win32/IcedIdLNK!rfn severe
Trojan:Win32/Kazadm.A!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!rfn severe
Trojan:Win32/MalLoader!rfn severe
Trojan:Win32/Mutanbuch!rfn severe
Trojan:Win32/Nukesped.MK!MTB severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/SelfDel.A!MTB severe
Trojan:Win32/ShellCodRunner!rfn severe
Trojan:Win32/ShortSeek!rfn severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tiny.AB!MTB severe
Trojan:Win32/Tnega.BK!MTB severe
Trojan:Win32/Vindor!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win32/Zusy.BL!MTB severe
Trojan:Win64/Boldbadger!rfn severe
Trojan:Win64/BumbleBee!rfn severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/Emotetcrypt!rfn severe
Trojan:Win64/IcedID!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/MeshAgent!MSR severe
Trojan:Win64/Qakbot!rfn severe
Trojan:Win64/ShellcodeRunner!rfn severe
Trojan:Win64/SystemBC!rfn severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/XmrigMiner.RP!MTB severe
TrojanDownloader:BAT/DllInject!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:MSIL/Mallox!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:PDF/Qakbot!rfn severe
TrojanDownloader:PowerShell/Obfuse!rfn severe
TrojanDownloader:PowerShell/PEDropper!rfn severe
TrojanDownloader:Win32/ShortSeek!rfn severe
TrojanDropper:PowerShell/Doprimm!rfn severe
VirTool:WinNT/Rootkitdrv!rfn severe
Worm:Win32/Dorkbot!rfn severe
Worm:Win32/Mofksys!rfn severe
Worm:Win32/Mofksys.RND!MTB severe
Worm:Win32/SillyShareCopy.E severe
Worm:Win32/Vobfus!rfn severe