Windows Defender marks a valid file as Trojan:Win32/Bluteal.B!rfn

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In recent times, many users have reported an issue with Windows Defender erroneously tagging a valid file as Trojan:Win32/Bluteal.B!rfn. The files marked as Trojan:Win32/Bluteal.B!rfn are predominantly related to CPU mining activities.

According to user reports published on forums on June 24th, Windows Defender has commenced flagging the file 'C:\Windows\assembly\NativeImages_v4.0.30319_64\Microsoft.C26a36d2b#\daf01e12fa59ed340363c44b7deff15e\Microsoft.CertificateServices.PKIClient.Cmdlets.ni.dll' (a valid file) as Trojan:Win32/Bluteal.B!rfn.

Windows Defender marks a valid file as Trojan:Win32/Bluteal.B!rfn

Microsoft has also acknowledged an authentication error and released Windows Defender update 1.271.37.0 on June 26th to address this issue for users.

If similar behaviors are detected, you should check and install Windows Defender updates immediately.

To check for new Windows Defender updates, go to Settings =>Update & Security =>Windows Update =>Check for updates. New definitions for Windows Defender will be listed as Definition Update for Windows Defender.

There are cases where Windows Defender is disabled on the system without knowing the exact reason. If you encounter this situation, refer to the article Fixing Windows Defender Disabled to troubleshoot this issue.

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