The Zbot botnet is the latest example of the evolution of fast fluxing techniques. Fast fluxing is a way of hiding the infrastructure that hosts malware, phishing, and other nasty sites on a constantly-changing rotation of compromised hosts acting as proxies. The technique has been around for years, but Zbot has taken it to the next level in the advancement of techniques and the scope at which it runs. Zbot stands out in its makers’ business acumen and their ability to leverage these techniques to build out its level of services.”]
Source: https://www.darkreading.com/cloud/fast-flux-taken-to-the-next-level-with-zbot-botnet