Rooting SM-G800Y (Telstra) Handset ??

I've unlocked my handset and now want to change the boot/shutdown animations from the ugly Telstra ones to the stock Samsung ones. Has anyone successfully rooted the SM-G800Y (Telstra) handset yet? I did have a quick look at Chainfires Auto Root and the SM-G800Y is listed, but it's a different firmware version. Plus it makes references to Knox. What is Knox? I haven't tried to root a phone in over 3 years now so I'm out of the game when it comes to these "new" technologies?