Evolving ML-Based Intrusion Detection: Cyber Threat Intelligence for Dynamic Model Updates

Existing Intrusion Detection System (IDS) relies on pre-trained models that struggle to keep pace with the evolving nature of network threats, as they cannot detect new types of network attacks until updated. Cyber Threat Intelligence (CTI) is analyzed by professional teams and shared among organizations for collective defense. However, due to its diverse forms, existing research often only analyzes reports and extracts Indicators of Compromise (IoC) to create an IoC Database for configuring blocklists, a method that attackers can easily circumvent. Our study introduces a unified solution named Dynamic IDS with CTI Integrated (DICI), which focuses on enhancing IDS capabilities by integrating continuously updated CTI. This approach involves two key AI models: the first serves as the IDS Model, detecting network traffic, while the second, the CTI Transfer Model, analyzes and transforms CTI into actionable training data. The CTI Transfer Model continuously converts CTI information into training data for IDS, enabling dynamic model updates that improve and adapt to emerging threats dynamically. Our experimental results show that DICI significantly enhances detection capabilities. Integrating the IDS Model with CTI in DICI improved the F1 score by 9.29% compared to the system without CTI, allowing for more effective detection of complex threats such as port obfuscation and port hopping attacks. Furthermore, within the CTI Transfer Model, involving the ML method led to a 30.92% F1 score improvement over heuristic methods. These results confirm that continuously integrating CTI within DICI substantially boosts its ability to detect and respond to new types of cyber attacks.