Methodology for the Automated Metadata-Based Classification of Incriminating Digital Forensic Artefacts
Authors: Du, Xiaoyu and Scanlon, Mark
Publication Date: August 2019
Publication Name: The 12th International Workshop on Digital Forensics (WSDF), held at the 14th International Conference on Availability, Reliability and Security (ARES)
The ever increasing volume of data in digital forensic investigation is one of the most discussed challenges in the field. Usually, most of the file artefacts on the seized device are not relevant to the investigation. Manually retrieving suspicious file relevant to the investigation is like finding a needle in a haystack. In this paper, a methodology for automatic prioritising suspicious file artefacts (i.e., file artefacts that are relevant to the investigation) is proposed to reduce the manual work to be conducted. This methodology is designed to work in a human-in-the-loop fashion. In other words, it predicts/recommends that an artefact is suspicious rather than giving the final analysis result. A supervised machine learning approach is employed, which leverages the recorded results of previously processed cases. The process of features extraction, dataset generation, training and evaluation are presented in this paper. In addition, a toolkit for data extraction from disk images is outlined, which enables this method to be integrated with the conventional investigation process and work in an automated fashion.