How often should logged events be reviewed, according to security event monitoring standards?

The standard for reviewing logged events typically emphasizes the importance of timely and regular reviews to ensure that any security incidents can be promptly detected and responded to. Reviewing logged events every 15 calendar days aligns well with the guidelines put forth by NERC's Critical Infrastructure Protection (CIP) standards, which advocate for a detailed and frequent examination of security logs. This timeframe allows for a more effective monitoring process that helps to identify patterns or anomalies in security behavior before they escalate into serious threats.

In the context of cybersecurity, more frequent reviews can lead to better situational awareness and rapid incident response, which are critical in protecting critical infrastructure. Longer intervals, such as monthly or quarterly reviews, could result in missed security incidents or delayed responses to potential threats, reducing an organization’s ability to maintain its security posture effectively. Therefore, adhering to the 15-day review period is crucial for meeting the expectations set by regulatory standards and maintaining a robust security infrastructure.