[ale] What's the utility to shut out hackers/viri attempting sshd attacks?

[ale_nospam at fayettedigital.com (Jim)]

I've got a situation where a Korean site is banging sshd trying bunches 
of random user/passwords.  I know I've seen it discussed before.  Isn't 
there a utility that automatically adds this IP to a .deny file or 
otherwise shuts him out?

Thanks,
Jim.