[delinka]

"Piggybacking"? Presumably, they're hitting a REST API served up on an HTTP server on port 80 or 443 (hopefully 443...)

And sure - stick it behind a NAT, learn the servers that the systems reports to, block those (or set up your own DNS); nothing that the average mainstream consumer is capable of doing.

[xgbi]

The IPs are hardcoded in windows ethernet driver, no shit.. So yeah, spoffing it through DNS won't work. You have to have a physicall firewall between your PC and the internet and target these specific IPs to block efficiently.