Red Button's Account Takeover (ATO) Simulation Testing is a managed security service that simulates real-world account takeover attacks against a client's login infrastructure to identify weaknesses in authentication, session management, and account recovery mechanisms. The service begins with a pre-test analysis of the client's login workflows, including examination of client-side JavaScript, encrypted cookies, and other authentication mechanisms. Red Button then conducts controlled credential stuffing simulations using real-world breached credentials and high-volume automated login attempts via a globally distributed botnet, targeting login endpoints with hundreds of thousands of username/password pairs. The engagement is designed to be low-burden on the client's team, requiring no more than eight hours of their time. Upon completion, clients receive a detailed report documenting identified vulnerabilities along with prioritized remediation recommendations. The service is aimed at organizations seeking to validate the effectiveness of their existing ATO defenses against realistic attack scenarios, including enterprises, financial institutions, SaaS providers, and mobile network operators.