In SIR v9, the CCM (Computers Cleaned per Mille [Thousand] MSRT Executions) index presents the infection rate of the ecosystem, and it can be broken down by geographic location, by operating system, or by threat family. Because MSRT targets subset of the most prevalent malware, this index shows how different countries or platforms are impacted by these active threats, and helps end users, IT pros and other in building security fence.
For e.g., pic below shows Windows 7 is less botted (infected by bots or zombies and recruited by a botnet) than others.
"In addition CCM provided important data points to help track Waledac activity during Waledac takedown event. CCM now is used to interpret other datasets such as phishing and malicious site indices," explained MMPC.
More Info: SIR v9