Techniques › T1027.018 › AN2064
AN2064 Analytic 2064
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detection identifies execution of scripts containing high concentrations of invisible Unicode characters followed by decoding or interpretation behaviors (e.g., base64 decode, eval) and subsequent process or network activity. Emphasis is placed on mismatch between file entropy/structure and execution output.</p>
- Detects
- T1027.018 Invisible Unicode
- Part of
- DET0920 Detection Strategy for Invisible Unicode
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 | stat and lstat syscall results on files, including inode and permission info | DC0059 File Metadata |
| auditd:EXECVE | execve of script/interpreter (bash, python, node) with suspicious encoded or non-printable content | DC0064 Command Execution |
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 |
|---|---|
DecodeUtility | May include base64 |
EntropyThreshold | Useful for tuning sections containing high entropy indicative of Unicode sequences |