From owner-freebsd-pf@FreeBSD.ORG  Wed Feb  9 00:01:39 2011
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Date: Wed, 9 Feb 2011 01:01:35 +0100
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Cc: freebsd-pf@FreeBSD.org
Subject: Re: brutal SSH attacks
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>> Check your pflog. The ruleset itself seems fine (if it is complete and 
>> you did not forget to post
>> a vital part). We also can assume that pf is enabled, can we?
>
> What should I be looking for in pflog? I can't find anything ssh related. 
> I posted full ruleset too.
[...]
> [root@castor /var/log]# for log in pflog.?.bz2 ; do bzcat 
> $log|tcpdump -r - port ssh ; done
> reading from file -, link-type PFLOG (OpenBSD pflog file)
> reading from file -, link-type PFLOG (OpenBSD pflog file)
> reading from file -, link-type PFLOG (OpenBSD pflog file)
> reading from file -, link-type PFLOG (OpenBSD pflog file)

Well...

> block drop in quick from <abusive_hosts> to any
> pass quick inet proto tcp from any to 38.X.X.X port = ssh flags S/SA keep 
> state (source-track rule, max-src-conn 10, max-src-conn-rate 9/60, 
> overload <abusive_hosts> flush global, src.track 60)

"block drop in quick log..." and "pass quick inet proto log" might be 
useful. BTW, what version of FreeBSD are you using? The machine isn't 
multi-homed, is it?