Techniques › T1573 › AN0763
AN0763 Analytic 0763
Network Devices · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Unusual TLS tunnels through ports not normally encrypted (e.g., TLS on port 8080, 53). Defender sees NetFlow/IPFIX or packet inspection indicating high-entropy traffic volumes and asymmetric client/server exchange ratios.</p>
- Detects
- T1573 Encrypted Channel
- Part of
- DET0273 Detection Strategy for Encrypted Channel across OS Platforms
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| NSM:Flow | Session records with TLS-like byte patterns | DC0078 Network Traffic Flow |
| NSM:Connections | Abnormal certificate chains or non-standard ports carrying TLS | DC0085 Network Traffic Content |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
PortProfiles | Define expected TLS port usage to flag anomalies. |
TrafficAsymmetryRatio | Sent/received byte thresholds to catch hidden C2. |