Yet another .mu website hacked. A while ago I came across a domain qualitevolaille.mu which displays a Hacked By Probiltar page.
The domain was registered in 2014 and there is no detail about the registrant.
Following the question put by Avinash, the website of qualitevolaille.mu was compromised due to an un-patched CMS (Drupal). A vulnerability, among other flaws on the webserver could have allowed the attacker to upload a "webshell".
A "webshell" is a web-based tool that allows an attacker to launch commands server-side, run scripts, modify/create/delete files etc.