Windows 10: False Windows Defender Warnings??

I'm not sure if I'm posting this in the right subject area, but....Running Win11 Home 22H2 22621.755. After running 2 updates today, KB5018341 and then KB5018496 and both showing successful installs, a few minutes after restart, I got an email from *** Email address is removed for privacy *** telling me Windows Defender found a threat on K-------00 my computer's name and to open Windows Defender and take action right away. This happened twice. Once after each install restart.Defender is showing a green check mark in the system tray and opening it shows everything checked green. I've gone through each section

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Windows defender false positive - forced to allow threat

Windows defender has started to identify C:\Windows\System32\mshta.exe as a threat [normally reported as a Trojan Powessere.G]. I use mshta.exe to run an hta custom MsgBox - I have been hoping to keep using my current CustomMsgBox tool [batch file calling a vbs-hta file] until later this year when I hope to have had enough time to replace it with a PowerShell alternative.

Windows defender's notification lets me "allow the threat" but that seems to me to be a bigger security hole than is necessary - it will now ignore a potentially real intrusion when all I want to run is a genuine Windows component. My immediate problem is fixed but I would prefer to fix the false positive using the exclusions list.

I cleared the 'Allowed threats history' so I could use the exclusions list instead. I added C:\Windows\System32\mshta.exe to the file exclusions list and I checked that it had taken properly by checking the exclusions list both in the UI & in the Registry. But the exclusion made no difference, it continued to detect and block the exe.

I have repeated the attempt several times [by clearing the allowed threats list & exclusions list beforehand] and the results are the same every time
- allowing the threat works,
- using the exclusions list has no effect.

I studied the relevant tutorial but have not spotted an error in what I have been doing - Add or Remove Windows Defender Exclusions

Does anybody with experience of using the exclusions list to counter false positives have any suggestions for me?

Denis

 

False Security & Maintenance warning windows 10

Hi,

My system upgraded to Windows10 from windows 8.1 successfully.

In Windows 8.1 I was running Webroot SecureAnywhere and in Windows 10 it's running.

After upgrade windows defender is also running , when I switched off it. I started getting warning "Windows Defender and Webroot SecureAnywhere are both turned off".

I am not sure how to fix this issue of false warning.

Thanks

 

Windows Defender False alarm

I am getting many false alarms from Windows Defender.

When I follow up and look for details of the alarm/virus, there is nothing listed. .... so what is it picking up??

Haven't had the time to investigate fully. I havent changed any of its default settings since it installed with Win 10.

Windows Defender might be a half baked app from Microsoft??.