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Change logs for security intelligence update version 1.455.384.0

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

7/27/2026 11:32:46 PM

Added threat detections

Name Severity
Trojan:BAT/SalatStealer.BA!MTB severe
Trojan:JS/Obfuse.GPKD!MTB severe
Trojan:JS/RemcosRATt.SB!MTB severe
Trojan:JS/VIPKeyLogger.BAA!MTB severe
Trojan:PowerShell/PsExec.SL!ams severe
Trojan:Python/KeyLogger.C!MTB severe
Trojan:Win32/VBCrypt.SN!MTB severe
Trojan:Win32/Vimditator!MTB severe
Trojan:Win64/AbuseCommBack.PG severe
Trojan:Win64/AbuseCommBack.PG!sms severe
Trojan:Win64/AbuseCommMain.PG severe
Trojan:Win64/AbuseCommMain.PG!sms severe
Trojan:Win64/AnimateClipper.ANM!MTB severe

Updated threat detections

Name Severity
Adware:Win32/Tnega high
Backdoor:JS/Obfuse!AMTB severe
Backdoor:Linux/Dakkatoni.az!MTB severe
Backdoor:PHP/Webshell.PA severe
Backdoor:Win32/Koceg!rfn severe
Behavior:Win32/HijackLoader.NDC!MTB severe
Behavior:Win64/AbuseCommBack.B!sms severe
Behavior:Win64/AbuseCommMain.B!sms severe
BrowserModifier:MSIL/MediaArena high
BrowserModifier:Win32/Shafmia high
Exploit:O97M/CVE-2025-53770.DA!ams severe
Exploit:Ruby/JSShell.G!MSR severe
HackTool:Linux/Fscan.A!MTB high
HackTool:Linux/PthToolkitGen.ZZ high
HackTool:PowerShell/Malgent!AMTB high
HackTool:PowerShell/PowerView high
HackTool:Win32/crack high
HackTool:Win32/Keygen high
HackTool:Win32/Keygen!MTB high
HackTool:Win32/Patcher high
HackTool:Win32/WNetWatcher!MTB high
HackTool:Win64/Mimikatz!rfn high
Ransom:Win32/Basta!rfn severe
Ransom:Win32/Genasom!rfn severe
Ransom:Win32/Qilinloader!rfn severe
Ransom:Win32/WarLock.MKV!MTB severe
Ransom:Win64/Akira!rfn severe
Ransom:Win64/LockBit!rfn severe
Trojan:BAT/LNK_DarkGate!rfn severe
Trojan:BAT/Qakbot!rfn severe
Trojan:HTML/Obfuse!MSR severe
Trojan:HTML/Qakbot!rfn severe
Trojan:JS/Latrodectus!rfn severe
Trojan:JS/Malgent!MSR severe
Trojan:JS/NpmStealz severe
Trojan:JS/Obfuse.GPKC!MTB severe
Trojan:JS/QakbotLNK!rfn severe
Trojan:Linux/Multiverze!rfn severe
Trojan:MSIL/CoinMiner!rfn severe
Trojan:MSIL/SnakeKeylogger.YYJ!MTB severe
Trojan:PowerShell/Malgent!MSR severe
Trojan:PowerShell/Malgent!rfn severe
Trojan:Script/Obfuse severe
Trojan:VBS/Obfuse!rfn severe
Trojan:VBS/Pterodo!rfn severe
Trojan:VBS/Qakbot!rfn severe
Trojan:Win32/Alevaul!rfn severe
Trojan:Win32/Casdet!rfn severe
Trojan:Win32/Coroxy!rfn severe
Trojan:Win32/DllInject!MTB severe
Trojan:Win32/DownNPM.YAB!MTB severe
Trojan:Win32/Egairtigado!rfn severe
Trojan:Win32/Eqtonex!rfn severe
Trojan:Win32/FormBook!rfn severe
Trojan:Win32/ICLoader.GPKG!MTB severe
Trojan:Win32/Kepavll!rfn severe
Trojan:Win32/Leonem!rfn severe
Trojan:Win32/Malex!rfn severe
Trojan:Win32/Malgent severe
Trojan:Win32/Malgent!AMTB severe
Trojan:Win32/Malgent!MSR severe
Trojan:Win32/Malgent!rfn severe
Trojan:Win32/Mamson.A!ac severe
Trojan:Win32/MereTam!rfn severe
Trojan:Win32/OffLoader.YYK!MTB severe
Trojan:Win32/Oyster!rfn severe
Trojan:Win32/Pomal!rfn severe
Trojan:Win32/Qakbot!rfn severe
Trojan:Win32/Qwexlafiba!rfn severe
Trojan:Win32/Ravartar!rfn severe
Trojan:Win32/Seheq!rfn severe
Trojan:Win32/Supma.A severe
Trojan:Win32/Suschil!rfn severe
Trojan:Win32/SystemBC!rfn severe
Trojan:Win32/Tiggre!rfn severe
Trojan:Win32/Wacatac severe
Trojan:Win32/Yomal!rfn severe
Trojan:Win64/Coroxy!rfn severe
Trojan:Win64/CryptInject!rfn severe
Trojan:Win64/DLLHijack!rfn severe
Trojan:Win64/Emotet!rfn severe
Trojan:Win64/Emotetcrypt!rfn severe
Trojan:Win64/EmotetPacker!rfn severe
Trojan:Win64/HijackLoader!MTB severe
Trojan:Win64/Malgent!MSR severe
Trojan:Win64/Oyster!rfn severe
Trojan:Win64/Revsocks!rfn severe
Trojan:Win64/ShellCodeRunner.NXB!MTB severe
Trojan:Win64/Turla!rfn severe
Trojan:Win64/Zusy!rfn severe
TrojanDownloader:BAT/QakBotLoader!rfn severe
TrojanDownloader:JS/Qakbot!rfn severe
TrojanDownloader:O97M/Emotet!rfn severe
TrojanDownloader:Win32/ShortSeek!rfn severe
VirTool:Java/Meterpreter.A severe