Evolving techniques in cyber threat hunting: A systematic review

In the rapidly changing cybersecurity landscape, threat hunting has become a critical proactive defense against sophisticated cyber threats. While traditional security measures are essential, their reactive nature often falls short in countering malicious actors’ increasingly advanced tactics. This paper explores the crucial role of threat hunting, a systematic, analyst-driven process aimed at uncovering hidden threats lurking within an organization’s digital infrastructure before they escalate into major incidents. Despite its importance, the cybersecurity community grapples with several challenges, including the lack of standardized methodologies, the need for specialized expertise, and the integration of cutting-edge technologies like artificial intelligence (AI) for predictive threat identification. To tackle these challenges, this survey paper offers a comprehensive overview of current threat hunting practices, emphasizing the integration of AI-driven models for proactive threat prediction. Our research explores critical questions regarding the effectiveness of various threat hunting processes and the incorporation of advanced techniques such as augmented methodologies and machine learning. Our approach involves a systematic review of existing practices, including frameworks from industry leaders like IBM and CrowdStrike. We also explore resources for intelligence ontologies and automation tools. The background section clarifies the distinction between threat hunting and anomaly detection, emphasizing systematic processes crucial for effective threat hunting. We formulate hypotheses based on hidden states and observations, examine the interplay between anomaly detection and threat hunting, and introduce iterative detection methodologies and playbooks for enhanced threat detection. Our review encompasses supervised and unsupervised machine learning approaches, reasoning techniques, graph-based and rule-based methods, as well as other innovative strategies. We identify key challenges in the field, including the scarcity of labeled data, imbalanced datasets, the need for integrating multiple data sources, the rapid evolution of adversarial techniques, and the limited availability of human expertise and data intelligence. The discussion highlights the transformative impact of artificial intelligence on both threat hunting and cybercrime, reinforcing the importance of robust hypothesis development. This paper contributes a detailed analysis of the current state and future directions of threat hunting, offering actionable insights for researchers and practitioners to enhance threat detection and mitigation strategies in the ever-evolving cybersecurity landscape.