Altho I as a home user have disabled sshd I found this which may interest you?
http://www.pkts.ca/ssh-faker.shtml
and as it appears to be a GPL application for those who have no time to go to the link here is the authors introduction
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There's a worm out there that tries to log in through ssh using a long
list of popular usernames and passwords. If you don't want it to succeed,
it's a good idea to not let it connect to your actual sshd program.
Ssh-faker was initially written to deal with buffer overflow attacks
back when sshd was vulnerable (it may still be), but it works well for
this too.
This program is called by /etc/hosts.deny whenever someone connects to
port 22. Unless they type in a plaintext password or type the wrong
password, they get an ssh-compatible error message, and a syslog message
is generated. If they type in the right password, they are added to
/etc/hosts.allow, and their next connection will reach the real sshd.
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