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Change logs for security intelligence update version 1.451.193.0

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

5/31/2026 7:26:53 AM

Added threat detections

No new threat detections added in selected update

Updated threat detections

Name Severity
Backdoor:Linux/Mirai!rfn severe
Backdoor:MSIL/XWormRAT!rfn severe
Backdoor:Win32/Bifrose!pz severe
Backdoor:Win32/Remcos!rfn severe
Backdoor:Win64/PortStarter!rfn severe
Behavior:Win32/QuartzMoor!apsi severe
BrowserModifier:Win32/MediaArena high
HackTool:Python/Impacket!MSR high
HackTool:Win32/AutoKMS!pz high
HackTool:Win32/Keygen!pz high
HackTool:Win32/Mailpassview!rfn high
HackTool:Win32/Mimikatz.AA!MTB high
HackTool:Win32/Netpass high
Ransom:Win32/Cerber!pz severe
Ransom:Win32/Qilinloader!rfn severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:JS/ShaiWorm severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/BadIIS.HAB!MTB severe
Trojan:MSIL/ShellCodeRunner!rfn severe
Trojan:O97M/Malgent!MSR severe
Trojan:PowerShell/Powersploit.T severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:Python/MuddyWater.DB!MTB severe
Trojan:Python/Zusy!MTB severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Acll!rfn severe
Trojan:Win32/Coroxy!rfn severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Dynamer!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Fareit.VB!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Latrodectus!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!rfn severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ramsay!pz severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Remcos!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Stealer.HAC!MTB severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tedy!pz severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/ShellcodeRunner!rfn severe
Trojan:Win64/Tedy!pz severe
Trojan:Win64/XMRig.PA!MTB severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:PowerShell/Obfuse!rfn severe
TrojanDownloader:SWF/Esaprof!pz severe
TrojanDownloader:Win32/Fragtor.ARAZ!MTB severe
TrojanDownloader:Win32/Gasonen!pz severe
TrojanDownloader:X97M/Donoff severe
Worm:Win32/FakeFolder!pz severe
Worm:Win32/Ganelp.AF!MTB severe
Worm:Win32/Icorimg!pz severe