I gone through a nice white paper on HTTP Botnets from team-cymru.

“Botnets come in many flavors. As one might expect, these flavors all taste different. A lot of Internet users have had their taste of IRC, P2P and HTTP based botnets as their computers were infected with malicious software. HTTP based botnets seem to be the flavor of the month, but what do we know about the recipe for HTTP based botnets? Who’s actually cooking them? This paper takes a closer look at HTTP botnets and tries to give insight on who is behind the stove and what exactly is being served.”

See more about this white paper from original here: