Change logs for security intelligence update version 1.443.173.0

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

12/17/2025 9:25:57 AM

Added threat detections

Name	Severity
HackTool:Win64/Inject.SX!MTB	high
PWS:MSIL/Vidar.B!AMTB	severe
Trojan:JS/FakeAlert.A!AMTB	severe
Trojan:JS/Redirector.AA!AMTB	severe
Trojan:MSIL/PWSStealer.D!AMTB	severe
Trojan:PowerShell/Boxter.PGBP!MTB	severe
Trojan:PowerShell/SorvePotel.GFX!MTB	severe
Trojan:VBS/Obfuse.AA!AMTB	severe
Trojan:Win32/OffLoader.ZII!MTB	severe
Trojan:Win32/Stealc.C!AMTB	severe
Trojan:Win32/Vidar.A!AMTB	severe
Trojan:Win64/Redcap.ARPA!MTB	severe
Trojan:Win64/SantaStealer.A!AMTB	severe
Trojan:Win64/Vidar.B!AMTB	severe

Updated threat detections

Name	Severity
Adware:Win32/Tnega	high
Adware:Win32/Tnega!MSR	high
Backdoor:MSIL/Bladabindi!rfn	severe
Backdoor:PHP/Webshell.G!MSR	severe
Backdoor:Win32/Diffyndor!rfn	severe
Backdoor:Win32/Koceg!rfn	severe
Backdoor:Win32/Prorat.K	severe
Backdoor:Win64/Supper!rfn	severe
HackTool:Win32/BrowserPassview	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/Keygen	high
HackTool:Win32/Keygen!AMTB	high
HackTool:Win32/Keygen!rfn	high
HackTool:Win32/Patcher!MTB	high
PWS:MSIL/Vidar.B!AMTB	severe
PWS:Win32/Dyzap.N	severe
Ransom:Win32/Royal!rfn	severe
Ransom:Win64/Akira.GVA!MTB	severe
Ransom:Win64/Mallox!rfn	severe
Spyware:AndroidOS/Multiverze!rfn	high
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:HTA/Downloader!MSR	severe
Trojan:HTML/FakeLogin.A!AMTB	severe
Trojan:HTML/Qakbot!rfn	severe
Trojan:JS/IcedID!rfn	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:JS/Redirector	severe
Trojan:JS/Redirector.A!AMTB	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:MSIL/AgentTesla!rfn	severe
Trojan:MSIL/SorvePotel.GMT!MTB	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PDF/Phish!AMTB	severe
Trojan:Script/Malgent!MSR	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/Babar!MTB	severe
Trojan:Win32/Dynamer!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/GenusAgent.JL!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/LokiBot!rfn	severe
Trojan:Win32/Malex!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/MereTam!rfn	severe
Trojan:Win32/PhishLeonem!rfn	severe
Trojan:Win32/Ragzil.B	severe
Trojan:Win32/Rctopus	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/ShortcutFileInZipExec!rfn	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/Ulise!MSR	severe
Trojan:Win32/Vindor!rfn	severe
Trojan:Win32/Wacatac	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/DarkGate!MTB	severe
Trojan:Win64/Donut!rfn	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/Meterpreter!rfn	severe
Trojan:Win64/OyesterLoader!rfn	severe
Trojan:Win64/Tedy!MTB	severe
Trojan:Win64/Vidar.C!AMTB	severe
Trojan:Win64/ZLoader!rfn	severe
Trojan:Win64/ZLoaderE!rfn	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:HTML/Adodb.gen!A	severe
TrojanDownloader:JS/Obfuse!AMTB	severe
TrojanDownloader:Win32/Contaskitar!rfn	severe
TrojanDownloader:Win32/Reconyc!rfn	severe
TrojanDropper:PowerShell/Doprimm!rfn	severe
TrojanSpy:Win32/Nivdort!rfn	severe
VirTool:MSIL/Mythagent!rfn	severe
Worm:Win32/Emerleox!rfn	severe