Techniques › T1027.003 › AN0331
AN0331 Analytic 0331
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects execution of image viewers or PowerShell scripts accessing or decoding files with mismatched MIME headers or embedded script-like byte patterns; often correlated with suspicious parent-child process lineage and outbound connections.</p>
- Detects
- T1027.003 Steganography
- Part of
- DET0119 Detection Strategy for Steganographic Abuse in File & Script Execution
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=1 | DC0032 Process Creation |
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
| WinEventLog:Security | EventCode=4663, 4670, 4656 | DC0055 File Access |
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 |
|---|---|
ParentProcessImage | Tune to identify image editors/viewers invoking script interpreters (e.g., `mspaint.exe` > `powershell.exe`) |
MimeHeaderMismatchTolerance | Adjust tolerance for image file headers that do not match file extensions or content structure |
TimeWindow | Define the temporal range to correlate decoding → execution → network beaconing |