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I use webmin's linux firewall to block a range of ip's abusing services on my box. I also use <a href='http://fail2ban' target='_blank'>fail2ban</a> to watch failed login attempts against ftp, apache, and other services you can monitor.
http://www.fail2ban.org/wiki/index.php/Main_Page
As jaldeguer mentioned, the thing "built into Virtualmin" is the Linux Firewall module. It's a comprehensive UI for iptables.
You might also experiment with some variant of the example rules that Leif posted a while back to reduce SSH brute force attacks. The principle is the same, regardless of protocol (assuming the protocol is not stateless), and I believe FTP is a connection oriented protocol, so should work the same way.
Here's the thread about those rules:
http://www.virtualmin.com/index.php?option=com_fireboard&Itemid=77&a...
(You'd do it for port 21 and 20 for FTP, instead of 22.)
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