Block Parallels Desktop from connecting to domain without using `/etc/hosts`

I have the following lines in my /etc/hosts. Parallels Desktop keeps commenting lines which as it needs to connect to that domain. I tried changing access of /etc/hosts to 444 but it suddenly changed to 644. It seems like Parallels Desktop needs to edit /etc/hosts to define hosts on its local network. How can block access of Parallels Desktop from these domains without changing /etc/hosts?