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Unsupervised detection of malware in persistent web traffic

Persistent network communication can be found in many instances of malware. In this paper, we analyse the possibility of leveraging low variability of persistent malware communication for its detection. We propose a new method for capturing statistical fingerprints of connections and employ outlier detection to identify the malicious ones.

Emphasis is put on using minimal information possible to make our method very lightweight and easy to deploy. Anomaly detection is commonly used in networksecurity, yet to our best knowledge, there are not many works focusing on the persistent communication itself, without making further assumptions about its purpose.