Change logs for security intelligence update version 1.421.1958.0

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.

Looking for the latest update? Download the latest update

Security intelligence update version

Released on

2/18/2025 3:00:02 AM

Added threat detections

Name	Severity
Behavior:Win64/ReedBed.F	severe
Behavior:Win64/ReedBed.G!sms	severe
Ransom:Win32/ChortLocker.A	severe
Trojan:Win32/ClickFix.MD!MTB	severe
Trojan:Win32/Dukes!rfn	severe
Trojan:Win64/AbuseCommBack.IP	severe
Trojan:Win64/AbuseCommBack.IP!sms	severe
Trojan:Win64/AbuseCommMain.IP!sms	severe

Updated threat detections

Name	Severity
Adware:Win32/Agent	high
Adware:Win32/Hotbar	high
Backdoor:Linux/Bofishy.A	severe
Backdoor:MSIL/Bladabindi!atmn	severe
Backdoor:Win32/Beastdoor	severe
Backdoor:Win32/Berbew	severe
Backdoor:Win32/Berbew!pz	severe
Backdoor:Win32/Bifrose.AE	severe
Backdoor:Win32/Fynloski!pz	severe
Backdoor:Win32/Hupigon	severe
Backdoor:Win32/Hupigon.DZ	severe
Backdoor:Win32/Kitpolap.A	severe
Backdoor:Win32/Padodor.SK!MTB	severe
Backdoor:Win32/PcClient	severe
Backdoor:Win32/Plugx.N!dha	severe
Backdoor:Win32/Ursap!rts	severe
Behavior:Win32/Eldorado.MX!MTB	severe
Behavior:Win64/AbuseCommBack.A!sms	severe
Behavior:Win64/AbuseCommMain.A!sms	severe
Behavior:Win64/ReedBed.E	severe
BrowserModifier:Win32/Diplugem	high
BrowserModifier:Win32/Nonov.A	high
BrowserModifier:Win32/Prifou	high
DDoS:Win32/Abot.A	severe
Exploit:Win32/CVE-2015-1641	severe
HackTool:Win32/Agent!rfn	high
HackTool:Win32/Keygen	high
HackTool:Win32/Keygen!pz	high
Misleading:Linux/Chisel.A!MTB	high
Phish:HTML/FakeLogin.PF!MTB	severe
Phish:HTML/FakeLogin.PG!MTB	severe
Phish:HTML/FakeLogin.PH!MTB	severe
Program:AndroidOS/Multiverze	high
Program:AndroidOS/Multiverze!rfn	high
PWS:Win32/OnLineGames	severe
PWS:Win32/Zbot.gen!AF	severe
Ransom:Win32/Troldesh.A	severe
Rogue:Win32/Winwebsec	severe
SoftwareBundler:Win32/Ogimant	high
Tool:Win32/Multiverze!rfn	moderate
Trojan:Linux/Multiverze!rfn	severe
Trojan:MacOS/SpyEvil.C!MTB	severe
Trojan:MSIL/AgentTesla.AYO!MTB	severe
Trojan:MSIL/DarkTortilla!rfn	severe
Trojan:MSIL/LummaC!rfn	severe
Trojan:MSIL/RedLineStealer.KAI!MTB	severe
Trojan:MSIL/UmbralStealer.SG!MTB	severe
Trojan:Python/Multiverze!rfn	severe
Trojan:VBS/XWormRAT.RV!MTB	severe
Trojan:Win32/AutoitInject!rfn	severe
Trojan:Win32/Bervod	severe
Trojan:Win32/Bumat!rts	high
Trojan:Win32/ClickFix.DR!MTB	severe
Trojan:Win32/CobaltStrike!rfn	severe
Trojan:Win32/Comisproc	severe
Trojan:Win32/Dexel	severe
Trojan:Win32/DSSDetection	severe
Trojan:Win32/Emotet!rfn	severe
Trojan:Win32/Etset!rfn	severe
Trojan:Win32/Glupteba.PM!MTB	severe
Trojan:Win32/GuLoader.GNO!MTB	severe
Trojan:Win32/ICLoader!MTB	severe
Trojan:Win32/ICLoader!rfn	severe
Trojan:Win32/Iconomon	severe
Trojan:Win32/Leonem!rfn	severe
Trojan:Win32/LummaStealer!rfn	severe
Trojan:Win32/Malex!rfn	severe
Trojan:Win32/Malgent	severe
Trojan:Win32/Malgent!rfn	severe
Trojan:Win32/Multiverze!rfn	severe
Trojan:Win32/Occamy.C9B	severe
Trojan:Win32/Qukart!rfn	severe
Trojan:Win32/Ramsay!rfn	severe
Trojan:Win32/Recordbreaker.RPY!MTB	severe
Trojan:Win32/Seheq!rfn	severe
Trojan:Win32/Sisrop!rts	high
Trojan:Win32/Small	severe
Trojan:Win32/Startpage	severe
Trojan:Win32/Startpage.YT	severe
Trojan:Win32/Suschil!rfn	severe
Trojan:Win32/Trafog!rts	high
Trojan:Win32/VbInject!MTB	severe
Trojan:Win32/Vindor!pz	severe
Trojan:Win32/Waski!rfn	severe
Trojan:Win32/Yomal!rfn	severe
Trojan:Win32/Zbot!pz	severe
Trojan:Win32/Zusy!rfn	severe
Trojan:Win64/AbuseCommMain.IP	severe
Trojan:Win64/DisguisedXMRigMiner!rfn	severe
TrojanClicker:JS/Faceliker.A	severe
TrojanClicker:Win32/Foncsir.A	severe
TrojanDownloader:O97M/Emotet.AOPD!MTB	severe
TrojanDownloader:Win32/Banload	severe
TrojanDownloader:Win32/Dluca.AO	severe
TrojanDownloader:Win32/Fosniw	severe
TrojanDownloader:Win32/Renos	severe
TrojanDownloader:Win32/Renos.MJ	severe
TrojanDownloader:Win32/Small	severe
TrojanDropper:AndroidOS/SAgnt.E!MTB	severe
TrojanDropper:Win32/Picazen.A	severe
TrojanProxy:Win32/Dorando!rfn	severe
TrojanSpy:Win32/Ambler!pz	severe
VirTool:Win32/CobaltStrike.H	severe
VirTool:Win32/DelfInject!rfn	severe
VirTool:Win32/Obfuscator	severe
VirTool:Win32/Vbinder!rfn	severe
VirTool:Win32/VBInject!rfn	severe
VirTool:Win32/VBInject.gen!EP	severe
Worm:MSIL/Mofin.A	severe
Worm:Win32/Ainslot.A	severe
Worm:Win32/Autorun	severe
Worm:Win32/Autorun.QS	severe
Worm:Win32/Mofksys.RND!MTB	severe
Worm:Win32/Rebhip	severe
Worm:Win32/Rebhip.A	severe