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Automated Classification of Port-Scans from Distributed Sensors

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5 Author(s)

Computer worms randomly perform port-scans to find vulnerable hosts to intrude over the Internet. Malicious software varies its port-scan strategy, e.g., some hosts intensively perform scans on a particular target and some hosts scan uniformly over IP address blocks. In this paper, we propose a new automated worm classification scheme from distributed observations. Our proposed scheme can detect some statistics of worm behavior with a simple decision tree consisting of some nodes to classify source addresses with optimal threshold values. The choice of thresholds is automated to minimize the entropy gain of classification. Once a tree is constructed, the classification can be done very quickly and accurately. In this paper, we analyze a set of source addresses observed by the distributed sensors in IS- DAS observed with 30 sensors in one year in order to clarify a primary statistics of worms. Based on the statistical characteristics, we present the proposed classification and show th e performance of the proposed scheme.

Published in:

Advanced Information Networking and Applications, 2008. AINA 2008. 22nd International Conference on

Date of Conference:

25-28 March 2008