Skills Assigment - Pivoting, Tunneling, and Port Forwarding

Hey guys, im stuck in the last question " Submit the contents of C:\Flag.txt located on the Domain Controller. " i think im working more than im suppose to, i already reach the third host on the with vfrank and i already found other host where im guesting is the Domain Controller host, im trying to log in on that machine passing the hash but i dont know if im suppose to do that or maybe i can try to create or steal a ticket with mimikatzor Rubeus. Any helps guys its appreciated, it have been a fun and learning module but its time hahahaha thanks in advanced!

enumerate closely. take a look at the file explorer. there may be something useful there.