CODEWITHSUNDEEP
windowspowershellerror-handlingwindows-defender
Schooi
Schooi

Reputation: 13

Add-MpPreference working for me but not for other machines

I am using Powershell to add a Windows Defender exclusion for a file that gets falsely flagged as a workaround. I was testing my script in https://tria.ge and everything worked except the Add-MpPreference commands. I have searched everywhere and found nothing. For me it still works and that is why I am baffled.

The code I am using (snippets):

Show-Status "Adding antivirus exclusion for setup executable.."
Add-MpPreference -ExclusionPath "$SMTTempPath\SMTSetup.exe"

(I then download the file and run the setup)

and

Show-Status "Cleaning up temporary files and antivirus exclusion.."
Remove-Item -Path $SMTTempPath -Recurse -Force
Remove-MpPreference -ExclusionPath "$setupPath"

The variables are properly assigned and work.

Errors I get: On Windows 11:

Add-MpPreference : The term 'Add-MpPreference' is not recognized as the name of a cmdlet, function, script file, or
operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
again.
At C:\Users\Admin\AppData\Local\Temp\getsmt.ps1:70 char:1
+ Add-MpPreference -ExclusionPath "$SMTTempPath\SMTSetup.exe"
+ ~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Add-MpPreference:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

and on Windows 10 LSTC:

Add-MpPreference : Operation failed with the following error: 0x800106ba. Operation: MpPreference. Target:
ConfigListExtension.
At C:\Users\Admin\AppData\Local\Temp\getsmt.ps1:70 char:1
+ Add-MpPreference -ExclusionPath "$SMTTempPath\SMTSetup.exe"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (MSFT_MpPreference:root\Microsoft\...FT_MpPreference) [Add-MpPreference],
   CimException
    + FullyQualifiedErrorId : HRESULT 0x800106ba,Add-MpPreference

Add-MpPreference : Operation failed with the following error: 0x%1!x!
At C:\Users\Admin\AppData\Local\Temp\getsmt.ps1:70 char:1
+ Add-MpPreference -ExclusionPath "$SMTTempPath\SMTSetup.exe"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (MSFT_MpPreference:root\Microsoft\...FT_MpPreference) [Add-MpPreference],
   CimException
    + FullyQualifiedErrorId : HRESULT 0x800106ba,Add-MpPreference

What can I do on these machines to make Add-MpPreference and Remove-MpPreference work?

Upvotes: 0

Views: 104

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