Automatically Labeling Cyber Threat Intelligence reports using Natural Language Processing

Attribution provides valuable intelligence in the face of Advanced Persistent Threat (APT) attacks. By accurately identifying the culprits and actors behind the attacks, we can gain more insights into their motivations, capabilities, and potential future targets. Cyber Threat Intelligence (CTI) reports are relied upon to attribute these attacks effectively. These reports are compiled by security experts and provide valuable information about threat actors and their attacks. We are interested in building a fully automated APT attribution framework. An essential step in doing so is the automated processing and extraction of information from CTI reports. However, CTI reports are largely unstructured, making extraction and analysis of the information a difficult task. To begin this work, we introduce a method for automatically highlighting a CTI report with the main threat actor attributed within the report. This is done using a custom Natural Language Processing (NLP) model based on the spaCy library. Also, the study showcases and highlights the performance and effectiveness of various pdf-to-text Python libraries that were used in this work. Additionally, to evaluate the effectiveness of our model, we experimented on a dataset consisting of 605 English documents, which were randomly collected from various sources on the internet and manually labeled. Our method achieved an accuracy of 97%. Finally, we discuss the challenges associated with processing these documents automatically and propose some methods for tackling them.