Change logs for security intelligence update version 1.449.252.0

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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

4/23/2026 2:32:57 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/Berbew.AA!MTB	severe
Backdoor:Win64/Supper!rfn	severe
Exploit:O97M/CVE-2017-0199.RDK!MTB	severe
HackTool:Linux/PthToolkitGen.ZZ	high
HackTool:Python/Impacket!MSR	high
HackTool:Win32/AutoKMS!MTB	high
HackTool:Win32/AutoKMS.DA!MTB	high
HackTool:Win32/BrowserPassview!rfn	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/Keygen!MTB	high
HackTool:Win32/Mailpassview!rfn	high
HackTool:Win32/Malgent!MSR	high
HackTool:Win32/Patch	high
HackTool:Win32/Tnega!MSR	high
HackTool:Win32/Wincred.H	high
HackTool:Win32/WNetWatcher!MTB	high
HackTool:Win64/CobaltStrike!rfn	high
Ransom:Win32/ContiCrypt!rfn	severe
Ransom:Win32/Inc!rfn	severe
Ransom:Win32/Qilinloader!rfn	severe
Ransom:Win32/Trigona!rfn	severe
Ransom:Win64/LockBit!rfn	severe
SupportScam:Win32/Screcwon!AMTB	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:AndroidOS/Multiverze!rfn	severe
Trojan:BAT/LNK_DarkGate!rfn	severe
Trojan:HTML/Qakbot!rfn	severe
Trojan:HTML/Redirector.MSS!MTB	severe
Trojan:HTML/Redirector.VVZ!MTB	severe
Trojan:HTML/ScrInject.SMW!MTB	severe
Trojan:JS/Pterodo!rfn	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:Linux/Multiverze!rfn	severe
Trojan:Linux/PAMBackdoor!MTB	severe
Trojan:Linux/SAgnt!MSR	severe
Trojan:MacOS/Multiverze!rfn	severe
Trojan:MSIL/AgentTesla.TRF!MTB	severe
Trojan:MSIL/AsyncRat!rfn	severe
Trojan:MSIL/CryptInject!rfn	severe
Trojan:MSIL/Lazy.BAC!MTB	severe
Trojan:MSIL/Polazert!rfn	severe
Trojan:MSIL/Zilla!MTB	severe
Trojan:O97M/DDownloader!rfn	severe
Trojan:PDF/Phish!rfn	severe
Trojan:PowerShell/Obfuse!MSR	severe
Trojan:Script/Metasploit!MSR	severe
Trojan:Script/Multiverze!rfn	severe
Trojan:VBS/Obfuse!rfn	severe
Trojan:VBS/Qakbot!rfn	severe
Trojan:Win32/AgentCrypt!rfn	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/AutoitInject.SPB!MTB	severe
Trojan:Win32/AutoitShellInj.E!MTB	severe
Trojan:Win32/Blackmoon.GAS!MTB	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/ClipBanker!rfn	severe
Trojan:Win32/CoinMiner!rfn	severe
Trojan:Win32/DllInject!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/EncryptTarget.A	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/Farfli!rfn	severe
Trojan:Win32/Fimal!rfn	severe
Trojan:Win32/Flystudio!MTB	severe
Trojan:Win32/Glupteba!rfn	severe
Trojan:Win32/InjectorCrypt!rfn	severe
Trojan:Win32/IRCBot!rfn	severe
Trojan:Win32/Kazadm.A!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/LummaStealer	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/Malgent!MTB	severe
Trojan:Win32/MereTam!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/Razy.GPC!MTB	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/ShortSeek!rfn	severe
Trojan:Win32/Supma.A	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/SystemBC!rfn	severe
Trojan:Win32/Vidar!rfn	severe
Trojan:Win32/WinLNK!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win32/Zusy.BL!MTB	severe
Trojan:Win32/Zusy.KK!MTB	severe
Trojan:Win32/Zusy.PGZM!MTB	severe
Trojan:Win64/BazaarLoader!rfn	severe
Trojan:Win64/BumbleBee!rfn	severe
Trojan:Win64/Emotet!rfn	severe
Trojan:Win64/Emotetcrypt!rfn	severe
Trojan:Win64/EmotetPacker!rfn	severe
Trojan:Win64/Latrodectus!rfn	severe
Trojan:Win64/Lazy!rfn	severe
Trojan:Win64/Lazy.SPEE!MTB	severe
Trojan:Win64/MalCertPutty!rfn	severe
Trojan:Win64/Malgent!MSR	severe
Trojan:Win64/Meterpreter!rfn	severe
Trojan:Win64/NightHawk!rfn	severe
Trojan:Win64/Remcos.ARE!MTB	severe
Trojan:Win64/Rootkit!MSR	severe
Trojan:Win64/ShellcodeRunner!MTB	severe
Trojan:Win64/Tedy!MTB	severe
Trojan:Win64/Tedy.ZJJ!MTB	severe
Trojan:Win64/Xworm!rfn	severe
Trojan:Win64/XWorm.SXB!MTB	severe
Trojan:Win64/Zusy!rfn	severe
Trojan:Win64/Zusy.SXR!MTB	severe
TrojanDownloader:BAT/QakBotLoader!rfn	severe
TrojanDownloader:JS/Qakbot!rfn	severe
TrojanDownloader:O97M/Emotet!rfn	severe
TrojanDownloader:PowerShell/PEDropper!rfn	severe
TrojanDownloader:Win64/Phorpiex!MTB	severe
TrojanDropper:PowerShell/Doprimm!rfn	severe
TrojanDropper:Win32/Addrop!rfn	severe
TrojanDropper:Win32/Salgorea.AI!MTB	severe
VirTool:Java/Meterpreter.A	severe
Worm:Win32/Citeary!rfn	severe
Worm:Win32/Mofksys!rfn	severe
Worm:Win32/Nuqel!rfn	severe