Expert Speaks

Basics of SIEM Operational Strategy: Unlocking the Power of Security Information and Event Management

2025-03-12 16:26 Expert Speaks
In the ever-evolving digital landscape, organizations are increasingly recognizing the significance of Security Information and Event Management (SIEM) systems in identifying and responding to security incidents. However, the true efficiency of SIEM can only be realized when coupled with a well-defined operational strategy. This article aims to shed light on key elements that should be considered when developing a SIEM operational strategy, enhancing its effectiveness. Please note that while this article provides valuable guidance, it should not be regarded as a comprehensive operational strategy.

Security Information and Event Management

To embark on building a robust SIEM operational strategy, it's crucial to understand the fundamental purpose and capabilities of SIEM systems. These systems serve as the backbone for identifying, alerting, and reporting security events. Starting with a simple approach and expanding gradually as your processes mature is recommended.

Selective Log Collection

Collecting logs from every device in your environment may not be practical due to cost and efficiency constraints. Prioritizing log sources that provide valuable information to SIEM is vital. Here's a list of suggested log source prioritization for a small firm with a hybrid environment:

  • Critical Infrastructure Servers
  • Critical Applications
  • DMZ Servers
  • Production Servers
  • Network and Security Devices
  • Public Cloud Console

Note: Log source selection can vary depending on factors like IT environment, industry of your business, risk apatite etc.

Selecting Logging Levels

Collecting every single log generated can overwhelm your SIEM and impact its performance and storage. It's essential to select log types based on their severity level and the value they provide to your SIEM. Consider the suggested logging levels for various operating systems and applications.
Please note that the suggested logging levels may vary depending on the specific requirements of your organization and the importance of different log sources. It's important to customize these logging levels based on your environment and the value they provide to your SIEM

Purpose-Driven and Customized Correlation Rules

Correlating events from multiple sources lies at the heart of SIEM functionality. To optimize efficiency and derive maximum value from your SIEM investment, it's crucial to carefully choose and implement correlation rules that align with your specific environment. Follow these steps to effectively manage correlation rules:

  • Enable relevant correlation rules and fine-tune them based on observed events.
  • Stabilize the correlation rules and enable response actions.
  • Expand the range of enabled correlation rules based on high-level categories.
  • Develop custom correlation rules to address specific use cases.

Building Threat Intelligence

SIEM systems typically include built-in threat intelligence feeds. However, cross-checking these feeds with third-party sources enhances accuracy and reduces false positives. Configure correlation rules related to threat intelligence feeds to utilize multiple sources for reliable verdicts.

Customized Dashboards and Reports

Creating meaningful and actionable dashboards and reports is crucial for identifying abnormal patterns and events not covered by correlation rules. Customize default reports and dashboards to address specific needs and highlight relevant information. For example, focus on top users accessing malicious domains, authentication failures by executive management, or suspicious emails from executive management mailboxes.

By incorporating these recommendations, your SIEM operational strategy can become more organized, concise, and actionable. Additionally, consider including visual aids, referencing external sources, and providing additional resources to enhance the article's appeal and credibility.

Conclusion

A well-defined SIEM operational strategy is essential for maximizing the effectiveness of your security operations. By implementing selective log collection, purpose-driven correlation rules, robust threat intelligence, and customized dashboards, your organization can harness the full potential of SIEM. Remember, continuous refinement and adaptation are key to staying ahead of evolving threats. For comprehensive guidance and assistance, consider seeking the expertise of our experienced professionals at Cyber Command Safeguard your digital assets, protect your organization, and maintain the trust of your customers and partners in today's complex cyber landscape.