Change logs for security intelligence update version 1.451.131.0
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
5/27/2026 5:28:03 PM
Added threat detections
| Name | Severity |
|---|---|
| Ransom:MSIL/Lockscreen!pz | severe |
| Trojan:JS/Obfuse.AC!MSR | severe |
| Trojan:Win32/Vidar.SL!MTB | severe |
Updated threat detections
| Name | Severity |
|---|---|
| Adware:Win32/BetterSurf | high |
| Adware:Win32/Hotbar | high |
| Backdoor:Win32/Simda!pz | severe |
| Behavior:MacOS/SuspOsascriptExec.F | severe |
| Behavior:MacOS/SuspPassSteal.F | severe |
| BrowserModifier:Win32/Diplugem | high |
| HackTool:Win32/AutoKMS!pz | high |
| HackTool:Win32/Crack!pz | high |
| Ransom:VBS/Obfuse!MTB | severe |
| Ransom:Win32/Filecoder!pz | severe |
| SoftwareBundler:Win32/Prepscram | high |
| Trojan:MSIL/Bladabindi!MTB | severe |
| Trojan:Win32/CoinMiner!pz | severe |
| Trojan:Win32/Cozer!pz | severe |
| Trojan:Win32/Farfli!pz | severe |
| Trojan:Win32/LummaStealer!MSR | severe |
| Trojan:Win32/Seheq!rfn | severe |
| Trojan:Win32/SuspClickFix.Z2 | severe |
| Trojan:Win32/Tedy!pz | severe |
| Trojan:Win32/Virlock!MTB | severe |
| Trojan:Win32/Zbot!pz | severe |
| Trojan:Win64/Amadey!MTB | severe |
| Trojan:Win64/Malgent!MTB | severe |
| Trojan:Win64/Phorpiex!MTB | severe |
| Trojan:Win64/Vidar!MTB | severe |
| Worm:Win32/Fadok!pz | severe |
| Worm:Win32/FakeFolder!pz | severe |
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