Change logs for security intelligence update version 1.449.365.0

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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Security intelligence update version

Released on

4/30/2026 2:39:04 AM

Added threat detections

Name	Severity
Behavior:Win32/MarkHVAErrors.A	severe
Ransom:Win64/Petya.ARA!MTB	severe
Ransom:Win64/Petya.ARAC!MTB	severe
Trojan:HTML/Cryxos.PGBU!MTB	severe
Trojan:HTML/Reditector.MSD!MTB	severe
Trojan:JS/FakeAlert.PA!MTB	severe
Trojan:JS/Reditector.SBCP!MTB	severe
Trojan:MSIL/Vidar.DC!MTB	severe
Trojan:Script/SvgStealer.DEY!MTB	severe
Trojan:VBS/MassLogger.SPM!MTB	severe
Trojan:Win32/ClickFix.DJQ!MTB	severe
Trojan:Win32/LotusLite.RH!MTB	severe
Trojan:Win64/AbuseCommBack.NH	severe
Trojan:Win64/AbuseCommBack.NH!sms	severe
Trojan:Win64/AbuseCommBack.NI	severe
Trojan:Win64/AbuseCommBack.NI!sms	severe
Trojan:Win64/AbuseCommBack.NJ	severe
Trojan:Win64/AbuseCommBack.NJ!sms	severe
Trojan:Win64/AbuseCommBack.NK	severe
Trojan:Win64/AbuseCommBack.NK!sms	severe
Trojan:Win64/AbuseCommBack.NL	severe
Trojan:Win64/AbuseCommBack.NL!sms	severe
Trojan:Win64/AbuseCommBack.NM	severe
Trojan:Win64/AbuseCommBack.NM!sms	severe
Trojan:Win64/AbuseCommBack.NN	severe
Trojan:Win64/AbuseCommBack.NO	severe
Trojan:Win64/AbuseCommBack.NO!sms	severe
Trojan:Win64/AbuseCommBack.NP	severe
Trojan:Win64/AbuseCommBack.NP!sms	severe
Trojan:Win64/AbuseCommBack.NQ	severe
Trojan:Win64/AbuseCommBack.NQ!sms	severe
Trojan:Win64/AbuseCommBack.NR	severe
Trojan:Win64/AbuseCommBack.NR!sms	severe
Trojan:Win64/AbuseCommBack.NS	severe
Trojan:Win64/AbuseCommBack.NS!sms	severe
Trojan:Win64/AbuseCommBack.NT	severe
Trojan:Win64/AbuseCommBack.NT!sms	severe
Trojan:Win64/AbuseCommBack.NU	severe
Trojan:Win64/AbuseCommBack.NU!sms	severe
Trojan:Win64/AbuseCommBack.NV!sms	severe
Trojan:Win64/AbuseCommMain.NH	severe
Trojan:Win64/AbuseCommMain.NH!sms	severe
Trojan:Win64/AbuseCommMain.NI	severe
Trojan:Win64/AbuseCommMain.NI!sms	severe
Trojan:Win64/AbuseCommMain.NJ	severe
Trojan:Win64/AbuseCommMain.NJ!sms	severe
Trojan:Win64/AbuseCommMain.NK	severe
Trojan:Win64/AbuseCommMain.NK!sms	severe
Trojan:Win64/AbuseCommMain.NL	severe
Trojan:Win64/AbuseCommMain.NL!sms	severe
Trojan:Win64/AbuseCommMain.NM	severe
Trojan:Win64/AbuseCommMain.NM!sms	severe
Trojan:Win64/AbuseCommMain.NN	severe
Trojan:Win64/AbuseCommMain.NN!sms	severe
Trojan:Win64/AbuseCommMain.NO	severe
Trojan:Win64/AbuseCommMain.NO!sms	severe
Trojan:Win64/AbuseCommMain.NP	severe
Trojan:Win64/AbuseCommMain.NQ	severe
Trojan:Win64/AbuseCommMain.NQ!sms	severe
Trojan:Win64/AbuseCommMain.NR	severe
Trojan:Win64/AbuseCommMain.NR!sms	severe
Trojan:Win64/AbuseCommMain.NS	severe
Trojan:Win64/AbuseCommMain.NS!sms	severe
Trojan:Win64/AbuseCommMain.NT	severe
Trojan:Win64/AbuseCommMain.NT!sms	severe
Trojan:Win64/AbuseCommMain.NU	severe
Trojan:Win64/AbuseCommMain.NU!sms	severe
Trojan:Win64/AbuseCommMain.NV	severe
Trojan:Win64/GlassWorm.DA!MTB	severe
Trojan:Win64/PsDownloader.ARA!MTB	severe
Trojan:Win64/Vidar.DB!MTB	severe

Updated threat detections

Name	Severity
Adware:Win32/Tnega	high
Backdoor:ASP/Aspy	severe
Backdoor:ASP/SecChecker.A	severe
Backdoor:Linux/Mirai!rfn	severe
Backdoor:Win64/Coroxy!rfn	severe
Backdoor:Win64/PortStarter!rfn	severe
Behavior:Win32/Mamadut.BG	severe
Behavior:Win32/Mamadut.BV	severe
Behavior:Win32/Mamadut.CH	severe
Behavior:Win32/Mamadut.DC	severe
Behavior:Win32/Mamadut.EC	severe
Behavior:Win32/Mamadut.I	severe
Behavior:Win32/Mamadut.V	severe
Behavior:Win64/AbuseCommBack.B!sms	severe
Behavior:Win64/AbuseCommMain.B!sms	severe
BrowserModifier:Win32/Shafmia	high
DDoS:Win32/WprGoSecure!rfn	severe
HackTool:PowerShell/PowerView!pz	high
HackTool:Win32/Agent	high
HackTool:Win32/Crack!MTB	high
HackTool:Win32/Logoloz.A!MTB	high
HackTool:Win64/AutoKMS!MSR	high
Misleading:Win32/Lodi	high
Ransom:Linux/BlackCat!rfn	severe
Ransom:Win32/BastaLoader!rfn	severe
Ransom:Win32/Clop!rfn	severe
Ransom:Win32/Inc!rfn	severe
Ransom:Win64/Akira!rfn	severe
Ransom:Win64/Cyclops!rfn	severe
Ransom:Win64/Inc!rfn	severe
Ransom:Win64/Paradise!rfn	severe
SupportScam:Win32/Screcwon!AMTB	severe
Trojan:AndroidOS/AVerseFalc!rfn	severe
Trojan:BAT/Malgent!MSR	severe
Trojan:JS/Malgent!MSR	severe
Trojan:JS/Phish!rfn	severe
Trojan:JS/Pterodo!rfn	severe
Trojan:JS/Qakbot!rfn	severe
Trojan:JS/QakbotLNK!rfn	severe
Trojan:JS/XWORM.SS!MTB	severe
Trojan:MSIL/Cassandra!rfn	severe
Trojan:MSIL/Crysan!rfn	severe
Trojan:PowerShell/Malgent!MSR	severe
Trojan:Python/Multiverze!rfn	severe
Trojan:Script/Malgent!MSR	severe
Trojan:VBS/Emotet!rfn	severe
Trojan:VBS/ObfDldr!rfn	severe
Trojan:VBS/Obfuse!rfn	severe
Trojan:Win32/Acll!rfn	severe
Trojan:Win32/Agent!rfn	severe
Trojan:Win32/Alevaul!rfn	severe
Trojan:Win32/AutoitShellInj!rfn	severe
Trojan:Win32/Azorult!rfn	severe
Trojan:Win32/Blacksuit!rfn	severe
Trojan:Win32/Casdet!rfn	severe
Trojan:Win32/Coroxy!rfn	severe
Trojan:Win32/Egairtigado!rfn	severe
Trojan:Win32/Fauppod!rfn	severe
Trojan:Win32/Fragtor.ARA!MTB	severe
Trojan:Win32/IcedIdLNK!rfn	severe
Trojan:Win32/Kazadm.A!MTB	severe
Trojan:Win32/Kepavll!rfn	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/LsassCodeInjector!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!MSR	severe
Trojan:Win32/MereTam!rfn	severe
Trojan:Win32/Predator!rfn	severe
Trojan:Win32/Qakbot!rfn	severe
Trojan:Win32/Qwexlafiba!rfn	severe
Trojan:Win32/Raccoon!rfn	severe
Trojan:Win32/Ravartar!rfn	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/Stelac!rfn	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Tiggre!rfn	severe
Trojan:Win32/WinLNK.HFJ!MTB	severe
Trojan:Win32/WinLNKRun!rfn	severe
Trojan:Win32/XWorm!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Znyonm!rfn	severe
Trojan:Win64/AbuseCommBack.NN!sms	severe
Trojan:Win64/AbuseCommBack.NV	severe
Trojan:Win64/AbuseCommMain.NP!sms	severe
Trojan:Win64/AbuseCommMain.NV!sms	severe
Trojan:Win64/BLackWidow!rfn	severe
Trojan:Win64/BumbleBee!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/Latrodectus!rfn	severe
Trojan:Win64/Malgent!MTB	severe
Trojan:Win64/Oyster!rfn	severe
Trojan:Win64/OysterLoader!rfn	severe
Trojan:Win64/Qakbot!rfn	severe
Trojan:Win64/RALord!rfn	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:Win32/Andromeda.SIBC!MTB	severe
VirTool:WinNT/Rootkitdrv!rfn	severe