Techniques › T1568.003 › AN0729
AN0729 Analytic 0729
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Inspect resolver and audit logs for processes initiating outbound connections to ports calculated from DNS response IPs. Abnormal ephemeral port usage shortly after DNS queries can indicate DNS calculation behavior.</p>
- Detects
- T1568.003 DNS Calculation
- Part of
- DET0262 Detection Strategy for Dynamic Resolution through DNS Calculation
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 | connect | DC0082 Network Connection Creation |
| linux:syslog | DNS response IPs followed by connections to non-standard calculated ports | 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 |
|---|---|
EphemeralPortRange | Configured ephemeral port ranges per environment to reduce false positives |
ResolverWhitelist | Exclude trusted resolvers or internal services from analysis |