PWNED!
user was harder than root for me but I confirm it’s possible (and maybe easier) to own both user and root from Kali.
I was scaring myself when the root.txt hash didn’t work!! I had to restart the box because root.txt was modified (accidentally?!) by someone, after restarting i noticed that there was one more character at the end of the hash.
user hint: smb share enumeration + mount techniques + basic Windows password management
root hint: enumeration + google 
DM me for help if you want!
@L4mpje thank you for this awesome box!
