Techniques › T1132 › AN0302
AN0302 Analytic 0302
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Atypical processes (e.g., powershell.exe, regsvr32.exe) encode large outbound traffic using Base64 or other character encodings; this traffic is sent over uncommon ports or embedded in protocol fields (e.g., HTTP cookies or headers).</p>
- Detects
- T1132 Data Encoding
- Part of
- DET0108 Detection Strategy for Data Encoding in C2 Channels
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 | Unusual Base64-encoded content in URI, headers, or POST body | 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 | Adjust to accommodate legitimate compression or encryption patterns in normal web traffic |
ProcessAllowlist | Define expected processes initiating outbound traffic to reduce false positives |
AnomalyScoreThreshold | Set threshold for how far traffic deviates from baseline protocol structure or size |