Change logs for security intelligence update version 1.445.183.0

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 11:59:53 PM

Added threat detections

No new threat detections added in selected update

Updated threat detections

Name	Severity
Adware:Win32/Tnega	high
Backdoor:Win64/CobaltStrike!rfn	severe
Backdoor:Win64/Vankul!rfn	severe
Exploit:O97M/CVE-2017-0199.VDY!MTB	severe
Exploit:Win32/CVE-2021-36934!MSR	severe
HackTool:Linux/PthToolkitGen.ZZ	high
HackTool:Win32/AndroidUnlocker!MTB	high
HackTool:Win32/crack	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/Keygen	high
HackTool:Win32/Malgent!MSR	high
HackTool:Win32/WNetWatcher!MTB	high
HackTool:Win64/CobaltStrike!rfn	high
Ransom:MSIL/BigHead!rfn	severe
Ransom:Win32/Clop!rfn	severe
Ransom:Win32/DragonForce!rfn	severe
Ransom:Win32/MedusaLocker!rfn	severe
Ransom:Win32/Qilinloader!rfn	severe
Ransom:Win32/Trigona!rfn	severe
Ransom:Win64/Filecoder!rfn	severe
Ransom:Win64/LockBit!rfn	severe
SupportScam:Win32/Screcwon!AMTB	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/LNK_DarkGate!rfn	severe
Trojan:HTML/Qakbot!rfn	severe
Trojan:JS/Kovter!rfn	severe
Trojan:JS/Qakbot!rfn	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:MSIL/LummaC!rfn	severe
Trojan:MSIL/Polazert!rfn	severe
Trojan:PowerShell/Malgent!MSR	severe
Trojan:PowerShell/QakBot!rfn	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/Obfuse!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/Amadey!rfn	severe
Trojan:Win32/BatLoader!rfn	severe
Trojan:Win32/DllInject!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/KoiLoader!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/MalLoader!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/Skeeyah	severe
Trojan:Win32/Skeeyah.A!MTB	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/WinLNK!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Zloader!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/BumbleBee!rfn	severe
Trojan:Win64/CryptInject!rfn	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/IcedID!rfn	severe
Trojan:Win64/Lazy!rfn	severe
Trojan:Win64/ShellcodeRunner!MTB	severe
Trojan:Win64/ZLoader!rfn	severe
Trojan:Win64/ZLoaderE!rfn	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:HTML/Tnega!rfn	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDownloader:O97M/Emotet!rfn	severe
TrojanDownloader:O97M/EncDoc!rfn	severe
VirTool:WinNT/Rootkitdrv!rfn	severe
Worm:Win32/Gamarue.AN	severe