Episode 16 — Exploit certificate transparency for stealthy infrastructure clues

Certificate Transparency (CT) logs provide a goldmine of information for analysts looking to identify adversary infrastructure before it is even fully operational. This episode explores how to monitor public CT logs to discover newly issued Transport Layer Security (TLS) certificates that may be part of a domain-shadowing or typosquatting campaign. By examining the Common Name and Subject Alternative Name fields, an analyst can uncover stealthy subdomains that an attacker intends to use for phishing or command-and-control (C2) communication. In a GCTI scenario, you might use CT data to pivot from a single suspicious certificate to an entire cluster of malicious hostnames registered by the same threat group. Real-world best practices involve setting up automated alerts for certificates that mimic your organization's brand or industry peers, providing a crucial "left-of-boom" defensive advantage. Mastering CT exploitation ensures you can track the technical evolution of an adversary's staging environment with high precision. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.