2020 01 13 CrowdStrike and Broken Network Filter Drivers

  • run command prompt as admin

  • “c:”

  • “cd c:"

  • “netsh wfp show filters”

  • This’ll create “filters.xml”

  • “notepad filters.xml”

  • ctrl-f and find “CrowdStrike WFP Provider”

  • The “providerKey” will be a GUID for the filter - an example is the following:

  • Open registry editor as admin

  • Browse to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\BFE\Parameters\Policy\Persistent\Provider - or search for a “value” matching the providerKey above (eg “{dd00a9d2-2593-497a-b84e-a1c47ab952d5}”)

  • Back up the registry folder - right click “provider” and click export. Save this to a file.

  • Make sure you’ve got non-network-reliant access to the machine, either via the VM console or directly.

  • Right click ONLY the filter entry (eg “{dd00a9d2-2593-497a-b84e-a1c47ab952d5}”) and delete that.

  • Restart the operating system



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