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Infrastructure clustering

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Malicious Infrastructure Clustering: How Passive DNS, TLS Certificates, and ASNs Reveal Shared Campaigns
Threat Intel2026-05-03

Malicious Infrastructure Clustering: How Passive DNS, TLS Certificates, and ASNs Reveal Shared Campaigns

A single C2 IP is a clue; shared signing patterns and DNS co-occurrence are a map. This guide explains how defenders cluster infrastructure without chasing ghosts—and how to document findings for IR, threat intel, and law enforcement handoffs.

6 min read