Techniques › T1573.001 › AN0404
AN0404 Analytic 0404
Network Devices · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Flows showing encrypted payloads with high entropy not matching TLS handshake patterns, particularly when occurring on non-standard ports. Defender observes NetFlow/IPFIX byte distribution anomalies or IDS/IPS detecting symmetric encryption patterns without associated key exchange.</p>
- Detects
- T1573.001 Symmetric Cryptography
- Part of
- DET0143 Detection Strategy for Encrypted Channel via Symmetric Cryptography 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 | Flow records with entropy signatures resembling symmetric encryption | DC0078 Network Traffic Flow |
| NSM:Connections | Symmetric encryption detected without TLS handshake sequence | 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 | Baseline expected encryption by port/protocol. |
TrafficVolumeThreshold | Volume thresholds for distinguishing benign VPN traffic from hidden C2. |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2021-40449 | Microsoft Windows | Mapped |
| CVE-2021-40539 | Zoho ManageEngine | Mapped |
| CVE-2021-44077 | Zoho ManageEngine ServiceDesk Plus (SDP) / SupportCenter Plus | Mapped |