Detection of DoH traffic to known DoH-providers

This query identifies network traffic to well-known DoH endpoints (e.g., Cloudflare, Google, Quad9, Mozilla). DoH encrypts DNS requests inside HTTPS, which enhances privacy but creates blind spots for defenders. Adversaries can exploit DoH to bypass DNS-based filtering, hide access to phishing domains, establish stealthy command-and-control channels, or exfiltrate data without triggering traditional DNS logs. Monitoring and alerting on DoH connections helps restore visibility into DNS activity—one of the most critical layers of network defense.

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