Techniques › T1132.001 › AN0347
AN0347 Analytic 0347
macOS · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Processes use base64/xxd/openssl/python Objective‑C APIs to encode data (seen in EndpointSecurity exec events or Unified Logs) → quick outbound connections with large bytes_out or HTTP POSTs carrying Base64/MIME bodies.</p>
- Detects
- T1132.001 Standard Encoding
- Part of
- DET0124 Behavior-chain detection for T1132.001 Data Encoding: Standard Encoding (Base64/Hex/MIME) across Windows, Linux, macOS, ESXi
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 |
|---|---|---|
| macos:unifiedlog | process command line contains base64, -enc, openssl enc -base64 | DC0032 Process Creation |
| PF:Logs | outbound flows with bytes_out >> bytes_in | DC0078 Network Traffic Flow |
| NSM:Flow | http: HTTP body contains long Base64 sections | 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 |
|---|---|
AllowedDeveloperIDs | Signed/allowed developer binaries routinely using encoding. |
EntropyThreshold | Payload entropy cutoff. |
TimeWindow | Exec → egress window. |