Removed duplicate rule

rules/windows/process_creation/proc_creation_win_shell_spawn_mshta.yml

@@ -1,32 +0,0 @@
-title: Mshta Spawning Windows Shell
-id: 772bb24c-8df2-4be0-9157-ae4dfa794037
-status: experimental
-description: Detects a suspicious child process of a mshta.exe process
-references:
-    - https://app.any.run/tasks/f0fac90f-84ac-4faa-b5b2-f4353c388969/#
-    - https://app.any.run/tasks/9c0f37bc-867a-4314-b685-e101566766d7/
-author: Florian Roth
-date: 2021/06/28
-tags:
-    - attack.execution
-    - attack.defense_evasion
-    - attack.t1059.005
-    - attack.t1059.001
-    - attack.t1218    
-logsource:
-    category: process_creation
-    product: windows
-detection:
-    selection:
-        ParentImage|endswith: '\mshta.exe'
-        Image|endswith:
-            - '\powershell.exe'
-            - '\cmd.exe'
-            - '\WScript.exe'
-    condition: selection
-fields:
-    - CommandLine
-    - ParentCommandLine
-falsepositives:
-    - Unknown
-level: high