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Change logs for security intelligence update version 1.445.152.0

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

2/20/2026 4:29:42 AM

Added threat detections

Name Severity
Behavior:Win32/SmartLoader.Z!MTB severe
Behavior:Win32/SuspAccessOnDC.A!genA severe
PUA:AIGen/ClawBExt.A severe

Updated threat detections

Name Severity
Adware:Win32/Swiminen high
Backdoor:MSIL/Quasar!rfn severe
Backdoor:PHP/C99shell!rfn severe
Backdoor:PHP/Shell.M severe
Backdoor:PHP/Webshell!AMTB severe
Backdoor:Win64/CobaltStrike!rfn severe
Behavior:Win32/Mamadut.DR severe
Exploit:JS/ShellCode.gen severe
Exploit:Win32/DDEDownloader severe
Exploit:Win32/ShellCode.gen!C severe
Exploit:Win32/Tudimons.A!dha severe
HackTool:Python/Impacket!MSR high
HackTool:Python/Pourri.B!MTB high
HackTool:Win32/CobaltStrike!rfn high
HackTool:Win32/crack high
HackTool:Win32/Crack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Keygen!MTB high
HackTool:Win32/Logoloz!rfn high
HackTool:Win32/Meterpreter!rfn high
HackTool:Win32/Mimikatz.D high
HackTool:Win32/Ntscan high
HackTool:Win32/Patcher high
HackTool:Win32/Tnega!MSR high
Ransom:Linux/BlackSuit!rfn severe
Ransom:Win32/BlackCat!rfn severe
Ransom:Win32/Embargo!rfn severe
Ransom:Win32/Mortis!rfn severe
Ransom:Win32/Play!rfn severe
Ransom:Win32/Zudochka!rfn severe
Ransom:Win64/Akira!rfn severe
Ransom:Win64/Lockbit.PMK!MTB severe
Ransom:Win64/PANDORA.REL!MTB severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:BAT/StartPage severe
Trojan:HTML/IcedID!rfn severe
Trojan:HTML/Phish.ASF!MTB severe
Trojan:HTML/Phish.SLBE!MTB severe
Trojan:HTML/Qakbot!rfn severe
Trojan:HTML/Redirector!MTB severe
Trojan:Java/Adwind.G severe
Trojan:JS/Cryxos.AD!MTB severe
Trojan:JS/Obfuse!rfn severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:JS/Redirector.ABOB!MTB severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/AsyncRat!rfn severe
Trojan:MSIL/DllInject.N!MTB severe
Trojan:MSIL/Jalapeno!rfn severe
Trojan:MSIL/Masslogger!MTB severe
Trojan:MSIL/Redline!rfn severe
Trojan:MSIL/ShellcodeRunner!rfn severe
Trojan:MSIL/SnakeKeylogger.EANK!MTB severe
Trojan:MSIL/XWormRAT!rfn severe
Trojan:O97M/DDownloader!rfn severe
Trojan:O97M/Iscodtas.B severe
Trojan:PDF/Phish!rfn severe
Trojan:PDF/Qakbot!rfn severe
Trojan:PDF/Ursnif!rfn severe
Trojan:PowerShell/Malgent!MSR severe
Trojan:PowerShell/Powersploit.A!MTB severe
Trojan:PowerShell/Powersploit.T severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/Obfuse!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/AresLdrCrypt!rfn severe
Trojan:Win32/BadJoke!MTB severe
Trojan:Win32/Bumat!rts high
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Ceevee severe
Trojan:Win32/CobaltStrike!rfn severe
Trojan:Win32/CoinMiner severe
Trojan:Win32/CoreWarrior.DA!MTB severe
Trojan:Win32/Coroxy!rfn severe
Trojan:Win32/Cripack.PGCP!MTB severe
Trojan:Win32/CryptInject!MSR severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Dridex.ADR!MTB severe
Trojan:Win32/Dridex.DM!MTB severe
Trojan:Win32/Dynamer!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Eqtonex!bit severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Glupteba!MTB severe
Trojan:Win32/GuLoader.RAM!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/KoiLoader!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/Malgent!MTB severe
Trojan:Win32/Mamson.A!ac severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Nukesped.MK!MTB severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Rhadamanthys.SA severe
Trojan:Win32/Salgorea.C!MTB severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Shella!rfn severe
Trojan:Win32/Skeeyah.A!MTB severe
Trojan:Win32/Skeeyah.A!rfn severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Swisyn.ADA!MTB severe
Trojan:Win32/Tiggre!rfn severe
Trojan:Win32/Tnega!ml severe
Trojan:Win32/Tnega!rfn severe
Trojan:Win32/Tnega.BK!MTB severe
Trojan:Win32/WinLNK!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Zbot.HBAI!MTB severe
Trojan:Win32/Zloader!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win32/Zusy.BL!MTB severe
Trojan:Win32/Zusy.HBE!MTB severe
Trojan:Win64/BLackWidow!rfn 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/FateGrab!rfn severe
Trojan:Win64/FSAutcik severe
Trojan:Win64/Havoc!rfn severe
Trojan:Win64/IcedID!rfn severe
Trojan:Win64/Jobutyve!rfn severe
Trojan:Win64/KillProc!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/OysterLoader!rfn severe
Trojan:Win64/Reflo!rfn severe
Trojan:Win64/SpyLoader!rfn severe
Trojan:Win64/Zapchast.ARR!MTB severe
Trojan:Win64/ZLoader!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Emotet!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:O97M/Donoff!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:O97M/Qakbot!rfn severe
TrojanDownloader:O97M/Ursnif!rfn severe
TrojanDownloader:PowerShell/Obfuse!rfn severe
TrojanDownloader:VBS/Emotet!rfn severe
TrojanDownloader:Win32/Malgent!AMTB severe
TrojanProxy:Win32/Prorat.gen!A severe
TrojanSpy:AndroidOS/SMSAgnt.A!MTB severe
Worm:Win32/Sfone.ECP!MTB severe