@Senpaisol said:
Finally got root. This is an amazing box!USER:
use your own wordlist not rockyou! But before creating your wordlist gather as much info as possible and look for typos.
If you find something useful and working in searchsploit modify it to fit your needs.
With the right items you have to take massive action to get a stable shell.
ROOT:
- You dont need msfvenom if you can compile C
You don’t need to compile C if you can use bash 
(but either way works fine). And yeah, good advice about the wordlist stuff. It sounds like there’s a way to do this with an exploit and a way to do this with the GUI, so don’t think you’re limited to just one method of gaining access.