T1521.003 SSL Pinning — Detection Rules

Source-backed rule directory

No reviewed association in this snapshot.

Atlas deterministic concepts

No exact concept selected.

Anomaly models

No exact Atlas model in this snapshot.

ATT&CK analytic guidance

DET0646 Detection of SSL Pinning

AN1725 Analytic 1725

The defender correlates application TLS trust customization activity with subsequent outbound encrypted sessions that bypass enterprise interception visibility or fail only under enterprise inspection conditions. The analytic looks for an app establishing its own certificate or public-key trust logic, then initiating HTTPS sessions to destinations not aligned with approved app behavior, especially from background state or without recent user interaction. Higher-confidence observations come from Android runtime/framework telemetry showing custom trust manager, certificate validation override, or pin validation logic immediately preceding network connection attempts, combined with network evidence of failed-inspection patterns or opaque direct TLS sessions.

AN1726 Analytic 1726

The defender correlates supervised-device application posture and background execution context with network-side evidence that an app rejects enterprise inspection or performs certificate/public-key-bound trust behavior during TLS establishment. Because direct app-level pin-validation observability is weaker on iOS, the analytic is anchored primarily to network control-plane effects: repeated TLS handshake rejection under enterprise inspection, destination-specific inspection bypass patterns, or persistent opaque app-to-endpoint encrypted sessions inconsistent with baseline app behavior. Additional confidence comes from managed app identity, background execution context, and supervised device policy state.