SIEM and SOAR: The revolution in the automation of response to cybersecurity incidents

In complex IT environments with hundreds of servers, databases, VPNs, and employee devices connected simultaneously, the number of event logs generated daily is overwhelming. For a human team of security analysts in a SOC (Security Operations Center), manually reviewing each log to identify malicious behavior is a materially impossible task.

This is where the technological combination of SIEM and SOAR systems comes in, the modern reference architecture to centralize cybersecurity telemetry and automate defensive incident response.

SIEM: The Telemetry Centralizer

The SIEM system acts as an intelligent data aggregator. Collects logs from firewalls, antivirus, domain controllers, databases and web servers. Through advanced correlation rules and artificial intelligence, the SIEM detects anomalies:

• Correlation Example: If a user logs into the corporate VPN from Madrid, and 5 minutes later the same user tries to authenticate on a local server from Tokyo, the SIEM identifies this physical anomaly and launches a critical alert.

SOAR: The Autonomous Defense Executor

While the SIEM detects and reports, the SOAR system takes action. Using predefined automation flows known as playbooks, SOAR can immediately respond to the SIEM alert without waiting for a human analyst to review it:

1. Host Isolation: If the SIEM reports a ransomware infection on a computer on the network, SOAR instructs the network switch to immediately isolate the device from the local network.
2. Credential Revocation: Temporarily disable the affected user account in the Active Directory to prevent lateral propagation of the attack.
3. Ticket Generation: Open a support case detailing the incident and notify the rapid response team through encrypted channels.

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