Overview of OneDrive Enum Tool and Its Functionality

OneDrive Enum is a tool designed to exploit vulnerabilities in Microsoft OneDrive, particularly targeting organizational accounts. It effectively generates a vanity URL for users within an organization whenever files are saved via Microsoft applications, which can be exploited for user enumeration. By requiring knowledge of the organization's email format and domain, the tool can probe the SharePoint tenant for valid usernames through brute-force attacks, leveraging specific response codes to confirm their validity. Users report that tools like OneDrive Enum often yield new usernames not found through other open-source intelligence (OSINT) methods, enhancing initial access opportunities significantly.