10-D Security External Penetration Test is a professional service that simulates real-world cyberattacks against an organization's external-facing infrastructure. The service uses a black-box approach where testers receive no advanced knowledge about the target infrastructure, mimicking how an external attacker would operate. The testing methodology includes various attack techniques commonly used by cybercriminals such as phishing, vishing (phone-based attacks), password spray attacks, brute-force attacks, SQL injection, and cross-site scripting. The service is designed to evaluate an organization's defenses, incident response capabilities, and overall security posture. The service specializes in financial institutions and healthcare organizations, with testers who understand the unique threat landscapes and compliance requirements of these sectors. The testing includes both Red Team (attacker) and Blue Team (defender) perspectives, allowing organizations to exercise their security operations teams against realistic attack scenarios. Purple team exercises are also available, where the Red Team and Blue Team work collaboratively to improve cybersecurity defenses. The service provides detailed reports with recommendations for remediation following the completion of testing activities.