Techniques › T1090.004 › AN0564
AN0564 Analytic 0564
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Suspicious outbound HTTPS connections where the TLS Server Name Indication (SNI) does not match the HTTP Host header, indicating potential use of domain fronting to mask C2 traffic via CDNs.</p>
- Detects
- T1090.004 Domain Fronting
- Part of
- DET0196 Domain Fronting Behavior via Mismatched TLS SNI and HTTP Host Headers
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:Connections | TLS handshake + HTTP headers | DC0085 Network Traffic Content |
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
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 |
|---|---|
SNIHostMismatch | Define acceptable mismatch ratio between SNI and HTTP Host fields based on legitimate domain usage patterns. |
CDNAllowList | Whitelist of known safe CDN front-end domains (e.g., `cdn.company.com`). |
ProcessInitiator | Filter for suspicious initiators of domain fronting, e.g., scripting engines, lolbins, unknown binaries. |