Techniques › T1689 › AN0995
AN0995 Analytic 0995
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detection of processes launching downgraded PowerShell versions (e.g., v2) or other legacy binaries that lack logging or security features. Correlates command-line arguments, process metadata, and version fields. Monitors registry changes to Defender or HVCI keys that could indicate intentional downgrades.</p>
- Detects
- T1689 Downgrade Attack
- Part of
- DET0350 Detecting Downgrade Attacks
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:Security | EventCode=4657 | DC0063 Windows Registry Key Modification |
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 |
|---|---|
AllowedInterpreterVersions | Defines which versions of interpreters like PowerShell are permitted in the environment. |
RegistryDefenderKeys | Specific registry paths for monitoring Defender/HVCI configurations that may vary by Windows version. |