Unveiling the Frontiers of Cyber Threat Hunting: A Comprehensive Review of LLM-Based Approaches

The dynamic and ever-evolving cyber threat landscape necessitates proactive and sophisticated defensive strategies. Cyber threat hunting, a critical practice, moves beyond reactive security measures. It actively searches for undetected malicious activities. Traditionally reliant on human expertise and structured data analysis, threat hunting is increasingly augmented and transformed by the capabilities of artificial intelligence (AI) and machine learning (ML). Among the latest advancements, large language models (LLMs) have emerged as powerful tools with significant potential to revolutionize how cybersecurity professionals detect, analyze, and respond to threats. This paper presents a comprehensive and systematic review of the state-of-the-art LLM-based approaches for cyber threat hunting, focusing significantly on research published in 2025 and grounding these advances in foundational work published before 2023. We explore the diverse applications of LLMs throughout the threat-hunting lifecycle, including advanced cyber threat intelligence (CTI) analysis, real-time anomaly detection, incident response enhancement, and vulnerability prediction. Furthermore, we examine the foundational AI and LLM concepts driving these innovations. We delve into emergent datasets and evaluation methodologies crucial for progress and critically assess the substantial challenges, limitations, and ethical considerations such as robustness, explainability, data privacy, and adversarial vulnerabilities that are inherent in their deployment. Our review provides a novel synthesis of recent Large Language Model (LLM) applications in threat hunting and identifies critical research gaps. Additionally, it presents a refined perspective on the practical implementation and future trajectory of these technologies.