Techniques › T1071.003 › AN0379
AN0379 Analytic 0379
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects unauthorized use of SMTP/IMAP/POP3 by suspicious binaries (e.g., PowerShell, rundll32) to exfiltrate data or beacon via email, often bypassing proxy or content filters.</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 |
|---|---|---|
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
| WinEventLog:Sysmon | EventCode=1 | DC0032 Process Creation |
| NSM:Flow | smtp.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 |
|---|---|
ProcessImageName | Limit to uncommon clients (e.g., scripts or CLI tools using .NET SMTP libraries) |
DestPortFilter | Typically 25, 587, 993, 995, or 465 – flag anomalies |
AttachmentType | Flag suspicious attachments (e.g., .zip, .7z, .bin) |