Techniques › T1132.002 › AN0928
AN0928 Analytic 0928
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Shell scripts or binaries implement custom mapping tables (tr/sed/awk/golang/rust/python encode loops), or emit long high-entropy tokens that fail Base64/Hex validation → correlated with egress showing asymmetric flow, protocol-mismatch payloads, or DNS/HTTP bodies containing low-diversity-but-long custom alphabets.</p>
- Detects
- T1132.002 Non-Standard Encoding
- Part of
- DET0326 Behavior-chain detection for T1132.002 Data Encoding: Non-Standard Encoding 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 |
|---|---|---|
| auditd:SYSCALL | execve of interpreters (python, perl), custom binaries, or shell utilities with long arguments containing non-standard tokens | DC0032 Process Creation |
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
| NSM:Flow | http: HTTP bodies/headers contain long tokens with non-standard alphabets or constant-size periodic POSTs | 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 |
|---|---|
EntropyThreshold | Payload entropy minimum. |
TokenLengthThreshold | Length threshold for suspect tokens. |
BytesOutToInRatio | Asymmetry cutoff for flows. |
TimeWindow | Correlation join window. |
KnownEncoders | Legitimate internal tools/agents. |