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Change logs for security intelligence update version 1.461.91.0

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

10/18/2026 4:04:35 PM

Added threat detections

Name Severity
HackTool:Win32/Convagent!rfn high

Updated threat detections

Name Severity
Backdoor:Linux/Mirai!rfn severe
Backdoor:Linux/Multiverze!rfn severe
Backdoor:MSIL/Bladabindi!rfn severe
Backdoor:MSIL/Quasar!rfn severe
Backdoor:PHP/Remoteshell!rfn severe
Backdoor:Win64/Supper!rfn severe
Behavior:Win32/QuartzMoor!apsi severe
BrowserModifier:Win32/Diplugem!rfn high
HackTool:Win32/Crack!pz high
HackTool:Win32/Vyroq!pz high
PWS:Win32/Fareit!rfn severe
Ransom:Win32/BlackCat!rfn severe
Ransom:Win32/Mortis!rfn severe
Ransom:Win32/StopCrypt!pz severe
Ransom:Win64/Akira!rfn severe
Spyware:AndroidOS/Multiverze!rfn high
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:Linux/CoinMiner!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MacOS/Multiverze!rfn severe
Trojan:NPM/Multiverze!rfn severe
Trojan:O97M/DDownloader!rfn severe
Trojan:PDF/Phish!rfn severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/Pterodo!rfn severe
Trojan:Win32/AutoitShellInj.A!MTB severe
Trojan:Win32/ClipBanker.RPP!MTB severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Orsam!rts high
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Rozena!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/StormAttack!rfn severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win64/BumbleBee!rfn severe
Trojan:Win64/DllHijack!rfn severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/Zusy!MTB severe
TrojanDownloader:HTML/Adodb!rfn severe
TrojanDownloader:O97M/Donoff!rfn severe
TrojanDropper:AndroidOS/Multiverze!rfn severe
VirTool:Win32/RemoteExec severe