Bothunter (Linux, FREE!!)

[z1gg33]

have been playing around with this.

BotHunter is the first, and still the best, network-based malware infection diagnosis system out there. It tracks the two-way communication flows between your computer(s) and the Internet, comparing your network traffic against an abstract model of malware communication patterns.(1) Its goal is to catch bots and other coordination-centric malware infesting your network, and it is exceptionally effective.

BotHunter will help you catch malware infections that go regularly undetected by antivirus systems and completely ignored by traditional intrusion detection systems. Let's find out who really owns your network.

the windows ver, has been "coming" for a long long time....???

edit: doh!