Update posh_ps_mfa_requirement_tampering.yml

Author: damnkrishna

rules/windows/powershell/powershell_script/posh_ps_mfa_requirement_tampering.yml

@@ -24,10 +24,10 @@ detection:
         ScriptBlockText|contains: 'StrongAuthenticationRequirements'
     selection_clear:
         ScriptBlockText|contains:
-            - '= $null'
-            - '= @()'
+            - '$null'
+            - '@()'
             - '.Clear()'
     condition: all of selection_*
 falsepositives:
     - Legitimate administration scripts resetting a user's MFA methods at their request
-level: high
+level: high