Techniques › T1071.004 › AN1121
AN1121 Analytic 1121
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects high-frequency or anomalous DNS queries initiated by non-browser, non-system processes (e.g., PowerShell, rundll32, python.exe) used to establish command and control via DNS tunneling.</p>
- Detects
- T1071.004 DNS
- Part of
- DET0400 Behavioral Detection of DNS Tunneling and Application Layer Abuse
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 |
| NSM:Flow | dns.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 |
|---|---|
QueryLengthThreshold | Subdomain length for detecting base32/base64-encoded payloads |
ProcessImageFilter | Flag non-standard executables making DNS queries |
TimeWindow | Rate of queries in short interval per process |