Layer 3: Digital Forensic Investigations and Incident Response

The escalating prevalence of cybercrime demands forensic solutions that are not only effective but also accessible and economically viable for investigators, researchers, and law enforcement agencies. This chapter investigates open-source and cost-effective forensic tools across 11 critical domains, including computer, mobile, USB, email, web, drone, hardware, network, memory, Internet of Things (IoT), and emerging areas such as AI, blockchain, and cloud forensics. Each tool is systematically evaluated using a weighted scoring equation that considers parsing capabilities, header analysis, phishing/malware detection, integration efficiency, and cost/community support. The results reveal that advanced tools such as GHIDRA (84.0), Autopsy (81.5), and Volatility (80.25) achieve the highest scores in firmware, computer, and memory forensics, respectively, while lightweight utilities like microscope and soldering tools (57.0) or basic USB sniffers (63.25) score lower due to limited analytical functionality. Comparative graphs and tables highlight that firmware analysis and memory forensics consistently outperform other domains in terms of investigative depth, whereas domains such as drone and IoT forensics remain emerging with fragmented tool support. The chapter emphasizes that open-source solutions, despite certain limitations, offer scalable and cost-efficient alternatives to commercial suites, particularly in resource-constrained environments. Ultimately, the findings emphasize that a domain-specific yet integrative approach, leveraging open-source tools across forensic layers, is crucial for achieving reliable, cost-effective, and comprehensive digital investigations.