The rule 'Box Access Granted' detects instances where a user grants access to their Box account to Box technical support. Such access can be granted from the user’s account settings, and the rule aims to monitor these instances to ensure they are legitimate. The detection will trigger a low severity alert if access is granted, indicated by the event type 'ACCESS_GRANTED' in the log data. The rule includes a reference to Box support guidelines on managing access permissions, allowing for further action if necessary. The primary mitigation step is to investigate whether the access was granted intentionally by the user, ensuring there are no security concerns associated with unauthorized access or potential account misuse.