Techniques › T1001.001 › AN0030
AN0030 Analytic 0030
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Processes generating large outbound connections with disproportionate send/receive ratios, often to uncommon ports or hosts, potentially inserting meaningless data into protocol payloads.</p>
- Detects
- T1001.001 Junk Data
- Part of
- DET0011 Detecting Junk Data in C2 Channels via Behavioral Analysis
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=10 | DC0035 Process Access |
| NSM:Flow | TCP/UDP | 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 |
|---|---|
PayloadEntropyThreshold | Tunable threshold for Shannon entropy of network payloads. |
TimeWindow | Duration of outbound data transfer to evaluate disproportionate upload size. |
UserContext | Filter based on user accounts allowed to generate outbound traffic. |