Group Policy - Remove Barracuda's Old Phishing Outlook Plugin

[M4ndr4k3]

Hello All,

I'm running our DC on Server 2019 Std. We have a plugin from Barracuda that was deployed with our GP flawlessly. Barracuda since has upgraded their plugin and requested that we remove the old one. Easy enough....wrong.

I still have the install package and the policies built out. I pointed the already created policy to the uninstall.bat file that they have in the package and it isn't uninstalling on any domain machines.

I have also copied the files locally and ran the uninstall.bat as admin and it didn't uninstall either.

I contacted Barracuda and they only cited a couple of Microsoft docs and these PowerShell commands:
Get-App -OrganizationApp |FL DisplayName,AppID
Remove-App -OrganizationApp -Identity <GUID for Add-in>

I found the GUID and run the Remove-App command and it also didn't uninstall the plugin. They told me to open a case with Microsoft which I haven't been able to do for some reason, but I'm not sure they will be able to help either. The best response I received from them was to check in the 'Integrated apps' section of Microsoft's admin center, which doesn't show the old plugin since it wasn't created that way.

Has anyone ran into this (doubtful) or can anyone help me figure out why it won't uninstall through GP? I'll have the install and uninstall files attached. They seem so simple. Thank you!

-M4ndr4k3-

 

[ChatGPT]

manual deletion methods, cleaning orphaned program folders and registry keys would help remove leftovers. Ensure a backup before tampering with the registry or you risk issues in your environment. Here’s a process to follow:

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Manually Locate and Remove Barracuda Plugin Entries​

• Remove All Plugin Files:
  Navigate to %ProgramFiles% and %AppData% (including subfolders) looking for directories associated with Barracuda and remove them.
• Registry Cleanup:
• Open regedit.
• Search for related keys such as Barracuda, or the outdated plugin's name. Path examples:
  

       HKEY_CURRENT_USER\Software\
       HKEY_LOCAL_MACHINE\SOFTWARE\

• Carefully delete entries related only to the old plugin.
• Outlook Integration Items:
  If it’s linked to Outlook add-ins, visit:
  

  cmd
     Run Outlook > File > Options > Add-ins > COM Add-ins

  Disable and remove the older plugin directly.
• Verify Startup Paths:
• Use taskmgr or Autoruns.exe from SysInternals Suite to trace any residual startup programs or scripts connected to the plugin.

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Escalation Option: Uninstallers​

If still encountering issues, third-party uninstallers like Revo Uninstaller or Geek Uninstaller have advanced mechanisms to forcibly remove stuck programs, including their artifacts.
Last but not least, given Barracuda’s recommendation to approach Microsoft, opening a case may help uncover why the Remove-App command and GPO fail to orient to the plugin’s framework.
Let me know if you need support customizing commands or confirming file paths inside install.txt/uninstall.txt!