Very interesting article i read the past hour up
Marshal8e6, a global provider of Secure Web Gateway and email security products, announced today the findings of its extensive botnet research conducted by the company's TRACElabs threat research group. The data, compiled during the first quarter of 2009, represents two years of in-depth research and observation which provides detailed analysis of the inner workings of major botnets that Marshal8e6 has identified as the biggest spammers.
As part of the study's findings, TRACElabs determined that the Rustock and Xarvester malware provided the most efficient spambot code, enabling individual zombie computers to send 600,000 spam messages each over a 24 hour period.
More of the Article at http://www.darkreading.com/security/vulnerabilities/showArticle.jhtml?articleID=217000203&subSection=Antivirus