I'm just running my packet sniffer and observing some really wired stuff .....
My pc is constantly sending ICMP echo requests (pings) to different IP's that do not exist on the network.
What's alarming is that these pings are being sent at a rate of 45-50 ip's per second! This is the type of behavior you would expect from a virus infected PC, but my antivirus isn't reporting anything.
In the task manager, there dosen't seem to be any sus program running and I'm left scratching my head!
Hmm the bad part is that being ICMP you wont be able to catch the process in netstat or tcpview.
Have you installed any spyware recently ?
What you could do is install zonealarm and when each program tries to access the net it will ask you if you want to allow it to. When you see a process that you're not sure about, you'll have caught the offender.
Thats pretty much how I found a worm on my system, my antivirus didn't say anything.. and then ZA told me that dllhost.exe wanted to send email
All things failing, update virus defs and run a full system scan (dont rely on blodhound heuristics to catch things).. if nothing comes up, do a system restore... or worse a reinstall.