Disrupting Ransomware Actors on the Bitcoin Blockchain: A Graph Embedding Approach

Ransomware is a growing problem and significant threat to cybersecurity in the United States. One primary vector for ransomware payments is the Bitcoin network. Network science techniques are a potential approach to analyze ransomware payment networks to discover salient ransomware actors. In this study, we propose a design framework for labeling nodes in a ransomware payment network and identifying key ransomware Bitcoin addresses that can be targeted for disruption. By leveraging semi-supervised graph embedding methodology and updating the loss function of a prevailing algorithm, GraphSAGE, to manage dataset imbalance, we identify key wallets in our ransomware network. We demonstrate the utility of our approach with a case study identifying a Bitcoin wallet that has been reported as a ransomware actor as recently as December 2021 and has transferred over $450 million in Bitcoin.