The latest online CWSandbox provides network traffic in Libpcap format for recently submitted malware samples. I decided to give this feature a try, so I searched the Spam folder for one of my Gmail accounts. I was quickly reminded by Firefox 3 that visiting this site was a Bad Idea. After downloading the “viewer.exe” file, I uploaded it to the site. That site told me: The sample you have submitted has already been analysed. Please see the sample detail page for further information.”]
Source: https://taosecurity.blogspot.com/2008/10/cwsandbox-offers-pcaps.html