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The most widely publicized, and arguably most §damaging, types of malicious traffic on the§Internet today include worms, spam, viruses and §denial of service attacks. Internet worms§self propagate across networks exploiting flaws in §operating systems and services,§spreading viruses and congesting network links. It is§the aim of this dissertation to investigate §approaches for detecting a wide range of malicious§activity such as worms and (d)DoS. This dissertation§describes the design and implementation of a§framework for distributed intrusion detection. The§framework features heterogeneous sensors with a§configurable event source that can adapt by§dynamically composing components at run-time. The§sensors are controlled remotely by a management §application that can configure, extend and control§sensors individually. The framework is §extensible and allows researchers to quickly§implement and evaluate detection techniques §in a live network environment. It was found that the §framework could successfully detect a range of§malicious activity including worms on both low§utilisation dial-up links and gateway router links.