SecureDNS provides public DNS response for local domain queries that match.

Avast Free Antivirus / Premium Security
1

Hello,

I have Pro and the SecureDNS feature is overtaking DNS requests for local domain host queries that match publicly available host records. Can you force SecureDNS to trust the local DNS server for particular zones, i.e. my local domain zone?

2

https://www.avast.com/faq.php?article=AVKB188