Techniques › T1071.003 › AN0380
AN0380 Analytic 0380
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects non-interactive or script-driven email transmission using tools like
sendmail, mailx, or custom SMTP scripts by background processes, especially when sending attachments or large payloads.</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 |
|---|---|---|
| auditd:SYSCALL | execve | DC0032 Process Creation |
| 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 |
|---|---|
TransferSizeThreshold | Bytes transferred via SMTP session |
ScriptNameFilter | e.g., base64 encoded mailer scripts or one-liners in cron |