Over the past few months, the FireEye research team has seen a gradual but steady decline in the sheer number of Bots controlled by the spam king Storm. Quietly, Srizbi and Rustock have eclipsed Storm in our labs and at our (quicky growing!) customer base. Last month we found a very close, if not definitive, relationship between Srizbi, Pushdo, Rustock, and Mega-D. You can review our findings, as well as some of our peers confirming our discoveries below:
https://www.fireeyesolution.com/research/2008/08/srizbi-and-ru-1.htm
https://www.fireeyesolution.com/research/2008/08/srizbi-and-rust.html
http://www.darkreading.com/document.asp?doc_id=162056&WT.svl=news2_1
http://www.marshal.com/trace/traceitem.asp?article=751
The Botnet connections appear to go deeper - we have discovered that there is a direct connection between Storm, Pushdo and Trojan.Exchanger as well.