CWP hacked, how to change password and recover access using SSH

Hi,
I hope somebody can help me.
My VPS which I run with CWP has been hacked, websites and tracking systems destroyed.
The hacker has also disabled my password, so I can not gain access to CWP admin.
I did have backups enabled in the CWP Admin panel.
Is there a way to restore backups using SSH?
Alternatively, I tried changing password using SSH, but I get this error after "retype new password"
"Authentication token manipulation error", so the new password is not accepted.
Please help

if core files are changed you need to reinstall the OS, ***take backups

Do U have idea how it could be hacked ?
From CWP or direct from easy password