Security Operations Center

SOC operations, SIEM, threat hunting, and security monitoring.

Overview

SOC monitors, detects, and responds to security incidents.

SOC Structure

SIEM Configuration

Splunk Query

index=security sourcetype=firewall action=blocked
| stats count by src_ip
| where count > 100
| sort -count

ELK Stack Query

{
  "query": {
    "bool": {
      "must": [
        { "match": { "event_type": "failed_login" } },
        { "range": { "@timestamp": { "gte": "now-1h" } } }
      ]
    }
  },
  "aggs": {
    "by_ip": {
      "terms": { "field": "source_ip", "size": 10 }
    }
  }
}

Log Sources

Threat Hunting

# IOC search
iocs = {
    "ips": ["10.0.0.1", "192.168.1.100"],
    "domains": ["malicious.com"],
    "hashes": ["abc123..."]
}

for log in logs:
    for ip in iocs["ips"]:
        if ip in log:
            alert(f"IOC matched: {ip}")

Playbooks

phishing_response:
  steps:
    - isolate_endpoint
    - collect_emails
    - analyze_attachments
    - block_sender
    - notify_users
    - update_filters

Practice

Set up a basic SIEM with ELK Stack and create detection rules.