Every organization generates thousands, or even millions, of security events each day. Login attempts, file access, process creation, network connections, and application activity all produce logs that can help security teams understand what is happening within their environment. However, these logs only become valuable when they are collected, monitored, and analyzed effectively.
For Security Operations Center (SOC) analysts, security logs are one of the most important sources of evidence during an investigation. Without reliable logging, it becomes extremely difficult to determine how an attacker gained access, what actions they performed, or whether sensitive systems were affected. The MITRE ATT&CK framework and the NIST Cybersecurity Framework (CSF) both emphasize the importance of visibility and monitoring as key components of an effective cybersecurity program.
Why Security Logs Matter
Security logs provide a historical record of activity across an organization’s systems. They allow analysts to reconstruct events, identify suspicious behaviour, and determine the scope of an incident.
For example, Windows Security logs can reveal successful and failed authentication attempts, while Endpoint Detection and Response (EDR) solutions record process execution and suspicious endpoint activity. Firewall logs show network connections, and DNS logs provide insight into domain lookups performed by users and applications.
When combined, these logs create a timeline that helps analysts understand how an incident developed.
Without sufficient logging, investigators may only see isolated events instead of the complete attack sequence.
Mapping Logs to MITRE ATT&CK
The MITRE ATT&CK framework documents the techniques attackers use after gaining access to a system. Detecting these techniques depends heavily on collecting the appropriate log sources.
For example, suspicious PowerShell execution may indicate T1059.001 – PowerShell, while unusual authentication activity could relate to T1078 – Valid Accounts. Unexpected Remote Desktop connections may support investigations involving T1021 – Remote Services.
No single log source can detect every ATT&CK technique. Instead, organizations should collect information from multiple systems so analysts can correlate events and identify attacker behaviour more accurately.
The stronger an organization’s visibility, the more effectively it can detect malicious activity.
NIST Recommendations
The NIST Cybersecurity Framework identifies continuous monitoring as a fundamental security practice. Organizations should collect logs from endpoints, servers, identity providers, cloud services, firewalls, and other critical infrastructure.
Equally important is protecting the integrity of those logs. Attackers sometimes attempt to delete or modify security logs to hide their actions. Centralized log management and secure storage help preserve evidence for future investigations.
NIST also recommends establishing clear incident response procedures so analysts know how to collect evidence, validate alerts, and coordinate response efforts during security incidents.
Best Practices for SOC Analysts
Collecting logs is only the first step. Analysts should also understand how to interpret them effectively.
During an investigation, consider questions such as:
- Which systems generated relevant events?
- Are timestamps consistent across different log sources?
- What occurred immediately before the alert?
- Did the attacker authenticate successfully?
- Were additional systems affected?
Answering these questions helps analysts move beyond individual alerts and develop a complete understanding of the incident.
Consistent log review also improves detection engineering by identifying gaps in visibility and opportunities to create more effective detection rules.
Conclusion
Security logs are the foundation of effective threat detection and incident response. They provide the evidence needed to understand attacker behaviour, determine the scope of an incident, and support informed decision-making during investigations.
By aligning logging practices with the behavioural guidance of the MITRE ATT&CK framework and the monitoring recommendations of the NIST Cybersecurity Framework, organizations can improve visibility across their environments and respond to threats more effectively. For SOC analysts, strong logging is more than a technical requirement—it is the foundation of every successful security investigation.