Abstract
The increasing fusion of the global economy with digital infrastructure has elevated cyber threats from isolated technical issues to significant drivers of financial instability. Despite this, a measurement gap persists, as conventional financial risk models are ill-equipped to handle the high-dimensional and non-linear nature of Cyber Threat Intelligence (CTI). This study bridges this gap by developing and validating a predictive framework that translates global CTI into quantitative forecasts of systemic financial risk. Using a comprehensive dataset of over 77,000 daily cyber threat observations across 225 countries from 2015 to 2024, we forecast the U.S. St. Louis Fed Financial Stress Index (STLFSI). We conduct a comparative analysis of advanced deep learning architectures, including a Temporal Fusion Transformer (TFT), against canonical machine learning ensembles. Our results show that a gradient-boosted model (XGBoost) decisively outperforms other models, achieving an R² of 0.9883 and RMSE of 0.0321 on the hold-out test set. Employing Explainable AI (XAI) techniques, we deconstruct the model's predictions and find that its success stems from capturing the complex, non-linear interaction between cyber threat levels and the pre-existing state of financial market stress. This research provides robust empirical evidence of the cyber-financial nexus, offering a novel, data-driven methodology for asset managers, regulators, and security leaders to proactively quantify and manage a critical 21st-century risk.
Keywords: Cyber-Financial Risk; Systemic Risk; Cyber Threat Intelligence (CTI); Predictive Modeling; Machine Learning; Time-Series Forecasting; XGBoost; Explainable AI (XAI)
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