This rule is designed to detect instances of denied certificate enrollment requests within Active Directory Certificate Services (AD CS). Such denials can occur due to various reasons, including insufficient permissions on the specified certificate template or invalid digital signatures associated with the enrollment requests. By monitoring Event ID 53 from the Microsoft-Windows-CertificationAuthority provider, this rule alerts security teams to potential misconfigurations or unauthorized attempts to obtain certificates. Given the importance of certificate issuance for secure communications and authentication in a networked environment, detecting these anomalies promptly can help in mitigating risks related to credential theft and unauthorized access. The rule currently has a low severity level, indicating that while alerts should be reviewed, they might not always signify an immediate threat. However, continuous monitoring is essential to identify patterns or elevate issues that may suggest malicious activity.