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Change logs for security intelligence update version 1.449.113.0

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

4/15/2026 5:42:45 AM

Added threat detections

Name Severity
Behavior:Win32/CVE-2026-21643.DA!MTB severe
Behavior:Win32/Mamadut.IC severe
Behavior:Win32/RansomConfpy.SA severe
Behavior:Win64/ArmoredCrocodile.B severe
Trojan:JS/NameTrick.DA!MTB severe
Trojan:JS/NameTrick.DB!MTB severe
Trojan:JS/NameTrick.DC!MTB severe
Trojan:MSIL/PulsarRat!rfn severe
Trojan:Win32/MalDllOwnship.Z!MTB severe
Trojan:Win32/OffLoader.PGOH!MTB severe
Trojan:Win32/SuspClickFix.Q3 severe
Trojan:Win32/SuspDllOwnship.ZA!MTB severe
Trojan:Win32/SuspDllOwnship.ZB!MTB severe
Trojan:Win64/SilverFox.AKP!MTB severe

Updated threat detections

Name Severity
Adware:Win32/Tnega high
Adware:Win32/Tnega!MSR high
Behavior:Win32/Bluehammzer.Z!MTB severe
Behavior:Win32/Bluehammzer.ZA!MTB severe
Behavior:Win32/Mamadut.CZ severe
Behavior:Win32/Mamadut.S severe
FriendlyFiles low
HackTool:Win32/Agent high
HackTool:Win32/Chisel!rfn high
HackTool:Win32/Keygen high
Ransom:Win32/Clop!rfn severe
Ransom:Win32/LockBit!rfn severe
Ransom:Win64/Akira!rfn severe
Ransom:Win64/Cyclops!rfn severe
Ransom:Win64/DarkPower!rfn severe
Ransom:Win64/Filecoder!MTB severe
Ransom:Win64/Inc!rfn severe
Ransom:Win64/LockBit!rfn severe
Trojan:AIMCP/PromptInjection.A!Hook severe
Trojan:AndroidOS/AVerseFalc!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/Nioc!rfn severe
Trojan:HTML/Qakbot!rfn severe
Trojan:HTML/ScrInject.SJKP!MTB severe
Trojan:JS/JSCeal!MTB severe
Trojan:JS/Obfuscator!MSR severe
Trojan:JS/Obfuse!rfn severe
Trojan:JS/Phish!rfn severe
Trojan:JS/Pterodo!rfn severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:Linux/CoinMiner!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:Linux/SuspTrapExec.MP14 severe
Trojan:MSIL/Polazert!rfn severe
Trojan:MSIL/Tnega!rfn severe
Trojan:PowerShell/Powersploit.B severe
Trojan:PowerShell/QakBot!rfn severe
Trojan:Python/Multiverze!rfn severe
Trojan:Python/PWSStealer.C!AMTB severe
Trojan:VBS/Emotet!rfn severe
Trojan:VBS/ObfDldr!rfn severe
Trojan:VBS/Obfuse!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Acll!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/Blacksuit!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Ceevee severe
Trojan:Win32/Coroxy!rfn severe
Trojan:Win32/CryptInject severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Etset!rfn severe
Trojan:Win32/Fauppod!rfn severe
Trojan:Win32/IcedIdLNK!rfn severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/LsassCodeInjector!rfn severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/Necurs!rfn severe
Trojan:Win32/Pikabot!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Powdow!rfn severe
Trojan:Win32/Qbot!rfn severe
Trojan:Win32/QuasarRAT!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Raccoon!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Salgorea.SLWO!MTB severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/SystemBC!rfn severe
Trojan:Win32/Tnega!MSR severe
Trojan:Win32/Trec!rfn severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win32/Znyonm!rfn severe
Trojan:Win32/Zusy!MTB severe
Trojan:Win64/BLackWidow!rfn severe
Trojan:Win64/BumbleBee!rfn severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/EmotetPacker!rfn severe
Trojan:Win64/FakeAV!rfn severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/NightHawk!rfn severe
Trojan:Win64/Oyster!MTB severe
Trojan:Win64/PortStarter!rfn severe
Trojan:Win64/Qakbot!rfn severe
Trojan:Win64/Stealc.ZY severe
Trojan:Win64/Stealc.ZY!sms severe
Trojan:Win64/Tedy!MTB severe
Trojan:Win64/Vidar.ZY severe
Trojan:Win64/ZLoader!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Emotet!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:VBS/Emotet!rfn severe
UwS:MSIL/Malgent!MSR high
VirTool:Win64/Nimbez!rfn severe