Change logs for security intelligence update version 1.445.164.0

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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

2/20/2026 10:25:11 PM

Added threat detections

Name	Severity
DoS:Win32/SDeleteAbuse.CA!dha	severe
Exploit:Win32/Cheksumcontroller!MTB	severe
HackTool:Python/Impacket.AR!AMTB	high
Trojan:HTML/Redirector.TSJ!MTB	severe
Trojan:Linux/Mirai.SDGF!MTB	severe
Trojan:MSIL/Asyncrat.AYQB!MTB	severe
Trojan:Win32/ICLoader.RR!MTB	severe
Trojan:Win32/Mikey.LMN!MTB	severe
Trojan:Win64/Rhadamanthys.NTU!MTB	severe

Updated threat detections

Name	Severity
Adware:Win32/loderka	high
Backdoor:MSIL/AsyncRat!rfn	severe
Backdoor:PHP/Chopper.C!dha	severe
Backdoor:Win64/Supper!rfn	severe
Behavior:Win32/RyukRansom.DL!MTB	severe
Behavior:Win32/SuspOffice.MK	severe
Behavior:Win32/SuspService.AM	severe
Behavior:Win32/SuspService.JM	severe
Behavior:Win32/SuspService.MK	severe
Behavior:Win32/SuspService.NG	severe
Behavior:Win32/Ulise.AI!MTB	severe
BrowserModifier:Win32/MediaArena	high
Exploit:Ruby/JSShell.G!MSR	severe
Exploit:Win32/Tudimons.A!dha	severe
HackTool:PowerShell/Powersploit	high
HackTool:PowerShell/PowerView	high
HackTool:PowerShell/PowerView!pz	high
HackTool:Python/Impacket!AMTB	high
HackTool:Python/Impacket!MSR	high
HackTool:Python/Pourri.B!MTB	high
HackTool:Python/PyKerberoast!MSR	high
HackTool:Script/Malgent!MSR	high
HackTool:Win32/Activator	high
HackTool:Win32/Agent	high
HackTool:Win32/CobaltStrike!rfn	high
HackTool:Win32/crack	high
HackTool:Win32/Keygen	high
HackTool:Win32/LaZagne	high
HackTool:Win32/Malgent!MSR	high
Ransom:BAT/DisableDefender.A!dha	severe
Ransom:Win32/BlackCat!rfn	severe
Ransom:Win32/Filecoder!rfn	severe
Ransom:Win64/Akira!MTB	severe
Ransom:Win64/LockBit!rfn	severe
SupportScam:Win32/Screcwon.MD!MTB	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/LNK_DarkGate!rfn	severe
Trojan:BAT/Qakbot!rfn	severe
Trojan:HTML/EtherHide.HAB!MTB	severe
Trojan:HTML/Phish!MTB	severe
Trojan:HTML/Phish.ASF!MTB	severe
Trojan:HTML/Phish.HAV!MTB	severe
Trojan:HTML/Phish.SLBE!MTB	severe
Trojan:HTML/Redirector!MTB	severe
Trojan:JS/Cryxos.SLBB!MTB	severe
Trojan:JS/Malgent!MSR	severe
Trojan:JS/Obfuse.ABF!MTB	severe
Trojan:JS/Redirector.ABOB!MTB	severe
Trojan:Linux/CoinMiner!rfn	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:MSIL/Heracles.CC!MTB	severe
Trojan:MSIL/Lazy!rfn	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PDF/Phish!MSR	severe
Trojan:PowerShell/Agent.AKD	severe
Trojan:PowerShell/Malgent!MSR	severe
Trojan:PowerShell/Runner.PGRA!MTB	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:Script/Obfuse	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/Alevaul!MSR	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/AresLdrCrypt!rfn	severe
Trojan:Win32/BlackMoon.ABMN!MTB	severe
Trojan:Win32/BlackMoon.NK!MTB	severe
Trojan:Win32/Boxter!rfn	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Cerber.MPI!MTB	severe
Trojan:Win32/Copak.PGCP!MTB	severe
Trojan:Win32/CoreWarrior.DA!MTB	severe
Trojan:Win32/Coroxy!rfn	severe
Trojan:Win32/CryptInject	severe
Trojan:Win32/CryptInject!rfn	severe
Trojan:Win32/Dostre.CA!MTB	severe
Trojan:Win32/Dynamer!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/Fareit.VB!MTB	severe
Trojan:Win32/Hive!MTB	severe
Trojan:Win32/Hive!rfn	severe
Trojan:Win32/ICLoader!MTB	severe
Trojan:Win32/ICLoader!rfn	severe
Trojan:Win32/InfoStealer	severe
Trojan:Win32/Kazadm.A!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!rfn	severe
Trojan:Win32/MereTam!rfn	severe
Trojan:Win32/NjRat.NEAA!MTB	severe
Trojan:Win32/Nukesped.MK!MTB	severe
Trojan:Win32/Pomal!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/Qukart.ASO!MTB	severe
Trojan:Win32/Rugmi!rfn	severe
Trojan:Win32/Salgorea.C!MTB	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/ShortSeek!rfn	severe
Trojan:Win32/Skeeyah	severe
Trojan:Win32/Skeeyah.A!MTB	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/SystemBC!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/Tiny.AB!MTB	severe
Trojan:Win32/Vilsel.A!MTB	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Zbot.HBAI!MTB	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win32/Zusy.BL!MTB	severe
Trojan:Win64/BumbleBee!rfn	severe
Trojan:Win64/CobaltStrike!rfn	severe
Trojan:Win64/Emotet!rfn	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/EmotetPacker!rfn	severe
Trojan:Win64/Filecoder!MTB	severe
Trojan:Win64/IcedID!rfn	severe
Trojan:Win64/KillAV!MTB	severe
Trojan:Win64/Latrodectus!rfn	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/Oyster!rfn	severe
Trojan:Win64/Rhadamanthys!MTB	severe
Trojan:Win64/Rootkit!rfn	severe
Trojan:Win64/Zapchast.ARR!MTB	severe
Trojan:Win64/Zusy!MTB	severe
TrojanClicker:Win32/Doplik.Q	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDownloader:O97M/Emotet!rfn	severe
TrojanDownloader:PowerShell/Obfuse!rfn	severe
TrojanDownloader:Win32/Silcon!rfn	severe
VirTool:Java/Meterpreter.A	severe