Detecting Anomalies in Network Traffic
What's normal? What's not? How do analysts tell the difference?
Key takeaways
- Anomaly detection requires a baseline — you can't spot abnormal without knowing normal.
- Common network anomalies: beaconing, unusual outbound ports, internal hosts scanning peers.
- Context matters: same traffic pattern means different things at 2 PM vs. 3 AM on a weekend.
- Vijilan ThreatRespond analysts hunt for anomalies that correlate across multiple detection layers.
The most sophisticated attackers don't generate signature-match alerts. They blend into normal traffic — but perfectly blending into noise is impossible. Every action leaves a pattern.
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