Login
Abstract OpenBullet is an open-source testing software designed for web automation and penetration testing. However, due to its high configurability and support for credential stuffing, it has become a preferred weapon for cybercriminals. This paper analyzes the technical architecture of OpenBullet, its core components (configs, wordlists, proxies), and its legitimate vs. malicious use cases. Finally, we discuss detection and mitigation strategies for defenders. 1. Introduction In the landscape of web security, the line between legitimate automation tools and attack frameworks is often blurred. OpenBullet, first released on GitHub in 2018, was intended to help developers test their login systems, form validations, and API endpoints for robustness. Yet, its powerful "config" system and support for massive parallelism have turned it into a primary engine for credential stuffing and card cracking attacks.