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Change logs for security intelligence update version 1.449.173.0

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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Released on

4/18/2026 2:29:43 PM

Added threat detections

No new threat detections added in selected update

Updated threat detections

Name Severity
Backdoor:Linux/Gafgyt!rfn severe
Backdoor:Linux/Mirai!rfn severe
Backdoor:Win64/Nukesped severe
Backdoor:Win64/RomComLoader!rfn severe
Exploit:Win32/Tudimons.A!dha severe
HackTool:PowerShell/BloodHound high
HackTool:Python/Impacket!MSR high
HackTool:Win32/Crack!MTB high
HackTool:Win32/GameHack!MTB high
HackTool:Win32/Keygen high
HackTool:Win32/Mailpassview!rfn high
HackTool:Win32/Unlocker!MTB high
Ransom:MSIL/CryptoLocker!rfn severe
Ransom:Win32/Akira!rfn severe
Ransom:Win32/ContiCrypt!rfn severe
Ransom:Win32/Embargo!rfn severe
Ransom:Win32/Helldown!rfn severe
Ransom:Win32/Zudochka!rfn severe
Ransom:Win64/Ransomhub!rfn severe
SupportScam:Win32/Screcwon!AMTB severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:JS/Batloader!rfn severe
Trojan:JS/Malgent!MSR severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:JS/Ursnif!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MacOS/Multiverze!rfn severe
Trojan:MSIL/Heracles.CSG!MTB severe
Trojan:MSIL/LummaC!rfn severe
Trojan:O97M/Donoff severe
Trojan:PDF/Phish!rfn severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:Python/Multiverze!rfn severe
Trojan:Script/Multiverze!rfn severe
Trojan:VBS/Pterodo!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:VBS/SmugVBS!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Chopper.A severe
Trojan:Win32/CryptInject!rfn severe
Trojan:Win32/DarkGate!rfn severe
Trojan:Win32/DllInject!rfn severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/IcedIdLNK!rfn severe
Trojan:Win32/Injector!rfn severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/Malgent!MTB severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/Oyester!rfn severe
Trojan:Win32/PhishLeonem!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Predator!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Skeeyah!MSR severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/Tiggre!rfn severe
Trojan:Win32/Trickbot!rfn severe
Trojan:Win32/Vindor!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win64/Agent!AMTB severe
Trojan:Win64/BLackWidow!rfn severe
Trojan:Win64/CobaltStrike!rfn severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/DllInject!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/Emotetcrypt!rfn severe
Trojan:Win64/EmotetPacker!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/Maloder!rfn severe
Trojan:Win64/Meterpreter!rfn severe
Trojan:Win64/Mikey.DVN!MTB severe
Trojan:Win64/Oyster!rfn severe
Trojan:Win64/SpyLoader!rfn severe
Trojan:Win64/ZLoader!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:O97M/EncDoc.BK!MTB severe
TrojanDownloader:Win32/Citeary!rfn severe
VirTool:Java/Meterpreter.A severe
VirTool:Win32/Injector!rfn severe
VirTool:Win32/Sysdupate!rfn severe
Worm:Win32/Gamarue!rfn severe
Worm:Win32/Mofksys!rfn severe