Recently I've found reason to believe my Linux computer might have been compromised by a spam-bot. (I was blacklisted on CBL.) I carefully examined all running processes, and I don't see any process that's out of the ordinary.
If my Linux machine is running a spam-bot, how can I find out? I'm running Ubuntu 6.06. Are there some access logs that might be helpful, or software specially designed to detect this sort of thing?