The two-volume set, LNICST 613 and 614, constitutes the refereed post-conference proceedings of the 15th EAI International Conference on Digital Forensics and Cyber Crime, ICDF2C 2024, held in Dubrovnik, Croatia, during October 9–10, 2024. The 40 full papers presented here were carefully selected and reviewed from 90 submissions. These papers have been organized in the following topical sections: Part I- Artificial Intelligence & Security; Multimedia Forensics; Intrusion Detection; Intrusion and Fraud Detection; Large Language Models, Advances in Security and Forensics; Advances in Security and Forensics. Part II- Security Analytics, Threat Intelligence, Multimedia Forensics; Generative AI, Emerging Threats.