ChequeMark: An Ensemble Machine Learning Framework for After-Hours Business Deposit Fraud Detection

2026-08-21

AI Summary

本文提出一种结合XGBoost、Isolation Forest和GraphSAGE的多视角集成机器学习框架，以解决企业非营业时间存款欺诈检测问题。

Abstract

Cheque fraud is a material risk in after-hours business deposit operations because funds may be released within one business day, while cheque clearing takes several days. This timing gap creates a fraud exposure window for financial institutions. Prior mitigation relies on static, deposit-level checks and therefore miss historical client behavior and evolving patterns. To address this gap, we propose a multi-view ensemble ML framework that combines: Extreme Gradient Boosting (XGBoost) for known fraud patterns, Isolation Forest for label-free anomaly detection, and Graph Sample and Aggregate (GraphSAGE) for relational patterns associated with transaction activities. We then combine the three outputs into a single client-level risk score. Under stable conditions, performance is comparable to XGBoost; under a targeted distribution shift, our framework performs best (F1: 83.77%, FPR: 0.69%) versus XGBoost (F1: 82.77%, FPR: 0.72%). These results indicate improved robustness to distribution shift while preserving interpretability through plain-language explanations grounded in behavioural, anomaly, and relational evidence.

Problem

• cheque fraud
• after-hours business deposit
• fraud exposure window
• historical client behavior
• evolving patterns

Innovation

• ensemble machine learning
• XGBoost
• Isolation Forest
• GraphSAGE
• distribution shift