DNS Secretly Resets Itself Instantly and DNS Servers are Not Blocked by Windows 10 Firewall Rules

I noticed that on a Windows 10 machine I if I leave DHS to be auto-configured or change the DNS serves to OpenNIC addresses they are automatically reassigned to

Malware scanners are not detecting anything, but colleagues say it is a known attack vector to defeat DNS anonymity.

Only SpyHunter detects and reports this change, though I previously found evidence of this by testing. It also seems to override DNS configured by VPN software. It is forcing itself at the top of the list, so it always checks Google before considering OpenNIC as a fallback.

As a mitigation step I tried custom Inbound/Output firewall rules to block all traffic in a wide range of either IP, but these rules seem to fail because I can still ping those IP’s.

How can I find and fix the root cause and/or how can I completely block all DNS traffic to these IP’s?

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