wdfilter.sys

Microsoft — Microsoft Defender filter driver

When blamed in a crash: Often a victim, dig deeper

What to do

Defender's file filter. Genuine WdFilter crashes are rare — conflicts with a second antivirus are the usual story.

If a third-party antivirus is also installed, remove one of the two — running both is the classic trigger.
Run Windows Update (Defender platform updates ship there).
Check for disk corruption: chkdsk C: /f

Drop the .dmp file into our analyzer — it runs entirely in your browser. No upload, no size limit, no account.