This pretty much provides a spec for bot writers to avoid detection…

Prototype software sniffs out, disrupts botnets | NetworkWorld.com Community:

“However, we observe that the bots of a botnet demonstrate spatial-temporal correlation and similarities due to the nature of their pre-programmed response activities to control commands. This helps us identify command and control within network traffic. For instance, at a similar time, the bots within a botnet will execute the same command — obtain system information, scan the network — and report to the command and control server with the progress/result of the task. Normal network activities are unlikely to demonstrate such a synchronized or correlated behavior. Using BotSniffer’s sequential hypothesis testing algorithm, when we observe multiple instances of correlated and similar behaviors, we can conclude that a botnet is detected.”

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