Detection rules › Sigma
Potential PowerShell Downgrade Attack
Detects PowerShell downgrade attack by comparing the host versions with the actually used engine version 2.0
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Security-Auditing | 4688 | A new process has been created. |
Stages and Predicates
Stage 1: selection
or:
CommandLine|contains: ' -v 2 '
CommandLine|contains: ' -ve 2 '
CommandLine|contains: ' -ver 2 '
CommandLine|contains: ' -vers 2 '
CommandLine|contains: ' -versi 2 '
CommandLine|contains: ' -versio 2 '
CommandLine|contains: ' -version 2 '
Image|endswith: '\powershell.exe'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|