A number of Windows users have reported that Windows Defender is detecting legitimate Windows files as trojans.This incident is a reminder to business users that even established software can contain flaws, and that keeping current with updates is key for security and operations. If new Windows Defender definitions are available, they will be listed as "Definition Update for Windows Defender," the report said. To do so, users can go to Settings, click Update & Security, and then click Windows Update, and select Check for updates. Users who are experiencing this problem should check for new updates for Windows Defender, and install them immediately, according to the report.
It appears that the issue may have been resolved on Tuesday, with definition version 1.271.37.0, the report noted. Microsoft confirmed to Bleeping Computer that the detection was a false positive, and that it had already been addressed. Oracle_VM_VirtualBox_Extension_Pack-5.2.12.vbox-extpack.The following legitimate files have also been flagged as the trojan, according to the report: These files include CPU miners, which would be an appropriate threat to flag, but also real Windows files, which would not.įor example, one users posted in a Bleeping Computer forum this week that the program had begun detecting the legitimate file "C:\Windows\assembly\NativeImages_v9_64\Microsoft.C26a36d2b#\daf01e12fa59ed340363c44b7deff15e\.ni.dll" as Trojan:Win32/Bluteal.B!rfn, with the recommended action "Remove threat now." While no more detail is provided, users have noted that Windows Defender is now detecting files as Trojan:Win32/Bluteal.B!rfn.
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