Explainable AI-Driven Zero-Day Malware Detection Using Hybrid Transformer-Graph Networks in Cloud-Native Environments

Cloud-native environments increasingly rely on containers, microservices, Kubernetes orchestration, and automated deployment pipelines, creating complex attack surfaces vulnerable to zero-day malware. Traditional signature-based and isolated machine-learning approaches often fail to detect unknown threats and provide limited explanations for security analysts. This study proposes an Explainable Artificial Intelligence-driven zero-day malware-detection framework using hybrid Transformer-Graph Networks. The Transformer component analyzes temporal patterns in system calls, process execution, Kubernetes audit logs, network flows, identity events, and resource utilization. The Graph Neural Network component models relationships among containers, pods, services, service accounts, processes, nodes, and network endpoints. Their combined representation improves detection of multi-stage attacks, including privilege escalation, credential access, lateral movement, command-and-control communication, and cryptomining. Explainability methods identify influential events, features, and graph relationships behind each alert. The framework is evaluated using accuracy, precision, recall, F1-score, false-positive rate, detection latency, scalability, and explanation quality. It supports transparent, adaptive, and operationally useful threat detection for cloud-native security operations. REFERENCES [1] S. N. Qaisarani et al., "X-THREAT framework for adaptive and explainable deep learning-based minority-class and zero-day cyber threat detection," Scientific Reports, vol. 16, Art. no. 28721, 2026, doi: 10.1038/s41598-026-63529-5. [2] E. Amer, S. El-Sappagh, T. Abuhamad, B. A. S. Al-Rimy, and A. 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