Browsing by Author "Kahilakoski, Marko"

Various Denial of Service (DoS) attacks are common phenomena in the Internet. They can consume resources of servers, congest networks, disrupt services, or even halt systems. There are many machine learning approaches that attempt to detect and prevent attacks on multiple levels of abstraction. This thesis examines and reports different aspects of creating and using a dataset for machine learning purposes to detect attacks in a web server environment. We describe the problem field, origins and reasons behind the attacks, typical characteristics, and various types of attacks. We detail ways to mitigate the attacks and provide a review of current benchmark datasets. For the dataset used in this thesis, network traffic was captured in a real-world setting, and flow records were labeled. Experiments performed include selecting important features, comparing two supervised learning algorithms, and observing how a classifier model trained on network traffic on a specific date performs in detecting new malicious records over time in the same environment. The model was also tested with a recent benchmark dataset.