SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/secplus-siem-correlates-logs

What does a SIEM mainly do with the log data it collects?

It analyzes and correlates logs from many sources to generate alerts.

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  1. Delete old entries automatically
  2. Analyze it to generate alerts ✔
  3. Encrypt it for archival only

Why: A SIEM (Security Information and Event Management) system gathers logs in one place and looks for patterns across them. When rules match, it raises alerts. That helps analysts spot attacks no single log would reveal.

Huh, didn't know that: NIST describes SIEM products as having log servers that perform analysis and database servers that store the logs.

The dad joke
My SIEM has seen it all: one failed login, then eleven hundred more. It just raised an eyebrow and an alert.
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References

Answer: Analyze it to generate alerts. A SIEM (Security Information and Event Management) system gathers logs in one place and looks for patterns across them. When rules match, it raises alerts. That helps analysts spot attacks no single log would reveal.

  1. NIST SP 800-61 Rev. 2, Computer Security Incident Handling Guide nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-61r2.pdf
    they generate alerts based on analysis of log data
    Checked 2026-10-10.
  2. NIST SP 800-92, Guide to Computer Security Log Management nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-92.pdf
    SIEM products have one or more log servers that perform log
    Checked 2026-10-10.

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