Techniques › T1071.003 › AN0382
AN0382 Analytic 0382
Network Devices · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects hosts transmitting large volumes of SMTP, IMAP, or POP3 traffic to external IPs or relays that aren't associated with the enterprise mail infrastructure.</p>
- Detects
- T1071.003 Mail Protocols
- Part of
- DET0135 Detection of Mail Protocol-Based C2 Activity (SMTP, IMAP, POP3)
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 | smtp.log, conn.log | 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 |
|---|---|
ExternalMailRelayFilter | Dest IPs not matching sanctioned SMTP/IMAP relays |
OutflowToInflowRatio | Outbound email bytes vastly exceed response |