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Nowadays, IT systems rely mainly on artificial intelligence (AI) algorithms to process data. AI is generally used to extract knowledge from stored information and, depending on the nature of data, it may be necessary to apply different AI algorithms. In this article, a novel perspective on the use of AI to ensure the cybersecurity through the study of network traffic is presented. This is done through the construction of a two-stage cyberattack classification ensemble model addressing class imbalance following a one-vsrest (OvR) approach. With the growing trend of cyberattacks, it is essential to implement techniques that ensure legitimate access to information. To address this issue, this work proposes a network traffic classification system for different categories based on several AI techniques. In the first task, binary models are generated to clearly differentiate each type of traffic from the rest. With binary models generated, an ensemble model is developed in two phases, which allows the separation of legitimate and illegitimate traffic (phase 1) while also identifying the type of illegitimate traffic (phase 2). In this way, the proposed system allows a complete multiclass classification of network traffic. The estimation of global performance is done using a modern dataset (UNSW-NB15), evaluated using two approaches and compared with other state-of-art works. Our proposal, based on the construction of a two-step model, reaches an F1 of 0.912 for the first level of binary classification and 0.7754 for the multiclass classification. These results show that the proposed system outperforms other state-of-the-art approaches (+0.75% and +3.54% for binary andmulticlass classification, respectively) in terms of F1, as demonstrated through comparison togetherwith other relevant classification metrics. [ABSTRACT FROM AUTHOR]