So the hosting provider was hacked? Who was their hosting provider?
This is also why update signatures should be validated against a different server; it would require hackers to control bother servers to go undetected
>This is also why update signatures should be validated against a different server; it would require hackers to control bother servers to go undetected
No, it should be a hardcoded key held by the developer, preferably using a HSM, and maybe with some sort of notification capability in case the key was lost. Adding a second server adds marginal security. For instance if the developer's mail was hacked, an attacker would likely be able to reset passwords for both hosting providers.
Previous NS records were pointing at dns-parking.com, which is Hostinger. Although hard to be certain without more details whether a reseller or other supplier is involved.
You can see this in their DNS history:
notepad-plus-plus.org currently has an A record of 95.128.42.184, owned by "Aqua Ray SAS".
It switched up from 191.101.104.10 and 212.1.212.49 on 17/1, which is are Hostinger IP addresses.