Change logs for security intelligence update version 1.445.177.0

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 4:00:36 PM

Added threat detections

No new threat detections added in selected update

Updated threat detections

Name	Severity
Adware:Win32/Agent	high
Adware:Win32/ConvertAd	high
Backdoor:PHP/Chopper	severe
Backdoor:PHP/Dirtelti.MTG	severe
Exploit:JS/ShellCode.gen	severe
Exploit:Ruby/JSShell.G!MSR	severe
FriendlyFiles	low
HackTool:PowerShell/EventVwrBypass	high
HackTool:Python/Impacket!AMTB	high
HackTool:Python/Impacket.AAM	high
HackTool:Win32/AutoKMS	high
HackTool:Win32/AutoKMS!MTB	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/GameHack!MTB	high
HackTool:Win32/Keygen	high
HackTool:Win32/Keygen!AMTB	high
HackTool:Win32/Patcher	high
HackTool:Win32/Patcher!MTB	high
HackTool:Win32/PowersploitHijack.A!dll	high
Misleading:Win32/Lodi!MSR	high
Program:Linux/Multiverze!rfn	high
Ransom:Win64/LockBit!rfn	severe
Spyware:AndroidOS/Multiverze!rfn	high
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/Qakbot!rfn	severe
Trojan:HTML/Phish!MSR	severe
Trojan:HTML/Qakbot!rfn	severe
Trojan:HTML/Tivso.MKZ!MTB	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:Linux/Multiverze	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:Linux/SAgnt!MSR	severe
Trojan:MSIL/AgentTesla	severe
Trojan:MSIL/Malgent!MSR	severe
Trojan:MSIL/Polazert!rfn	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PDF/Phish!rfn	severe
Trojan:Script/CoinMiner!AMTB	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:VBS/Starter.PGST!MTB	severe
Trojan:Win2K/Malgent	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/Anaki.A!gfc	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Ceevee	severe
Trojan:Win32/DSSDetection	severe
Trojan:Win32/Dynamer!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/GhostSocks!rfn	severe
Trojan:Win32/GuLoader!rfn	severe
Trojan:Win32/Guloader.AV!MTB	severe
Trojan:Win32/GuLoader.PSL!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/Nukesped.MK!MTB	severe
Trojan:Win32/Pomal!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/QbotLNK!rfn	severe
Trojan:Win32/Runner.HB!MTB	severe
Trojan:Win32/Sapade	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/Skeeyah.A!MTB	severe
Trojan:Win32/Smokeloader!rfn	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Tasker!MTB	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/Tnega!MSR	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/BumbleBee!rfn	severe
Trojan:Win64/CobaltStrike!rfn	severe
Trojan:Win64/CoinMiner!rfn	severe
Trojan:Win64/CryptInject!rfn	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/Latrodectus!rfn	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/NightHawk!rfn	severe
Trojan:Win64/Oyster!rfn	severe
Trojan:Win64/ShellcodeRunner!rfn	severe
Trojan:Win64/Tedy!rfn	severe
Trojan:Win64/ThemidaPacked	severe
Trojan:Win64/TurtleLoader!rfn	severe
TrojanDownloader:BAT/Genmaldwn.K!bit	severe
TrojanDownloader:HTML/Adodb.gen!A	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDropper:Win32/Malgent!MSR	severe
VirTool:MSIL/Meterpreter.G!MTB	severe
VirTool:WinNT/Rootkitdrv!rfn	severe
Worm:BAT/Autorun.P	severe