Merge PR #5679 from @swachchhanda000 - chore: update evtx baseline to v0.8.2

chore: update evtx baseline to v0.8.2 and fix FPs
---------

Co-authored-by: Swachchhanda Shrawan Poudel <87493836+swachchhanda000@users.noreply.github.com>

rules/windows/powershell/powershell_script/posh_ps_cmdlet_scheduled_task.yml

@@ -7,6 +7,7 @@ references:
     - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1053.005/T1053.005.md#atomic-test-6---wmi-invoke-cimmethod-scheduled-task
 author: frack113
 date: 2021-12-28
+modified: 2025-10-07
 tags:
     - attack.persistence
     - attack.t1053.005
@@ -30,7 +31,12 @@ detection:
             - 'PS_ScheduledTask'
             - '-NameSpace'
             - 'Root\Microsoft\Windows\TaskScheduler'
-    condition: 1 of selection_*
+    filter_main_legitimate_scripts:
+        ScriptBlockText|contains|all:
+            - 'Microsoft.PowerShell.Core\Export-ModuleMember'
+            - 'Microsoft.Management.Infrastructure.CimInstance'
+            - '__cmdletization_methodParameter'
+    condition: 1 of selection_* and not 1 of filter_main_*
 falsepositives:
     - Unknown
 level: medium

rules/windows/powershell/powershell_script/posh_ps_susp_clear_eventlog.yml

@@ -14,7 +14,7 @@ references:
     - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear
 author: Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems)
 date: 2022-09-12
-modified: 2025-03-12
+modified: 2025-10-06
 tags:
     - attack.defense-evasion
     - attack.t1070.001
@@ -32,7 +32,7 @@ detection:
         - ScriptBlockText|contains|all:
               - 'Eventing.Reader.EventLogSession' # [System.Diagnostics.Eventing.Reader.EventLogSession]::GlobalSession.ClearLog($_.LogName)
               - 'ClearLog'
-        - ScriptBlockText|contains:
+        - ScriptBlockText|contains|all:
               - 'Diagnostics.EventLog'
               - 'Clear'
     condition: selection

rules/windows/powershell/powershell_script/posh_ps_susp_mounted_share_deletion.yml

@@ -6,7 +6,7 @@ references:
     - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.005/T1070.005.md
 author: 'oscd.community, @redcanary, Zach Stanford @svch0st'
 date: 2020-10-08
-modified: 2022-12-25
+modified: 2025-10-07
 tags:
     - attack.defense-evasion
     - attack.t1070.005
@@ -19,7 +19,14 @@ detection:
         ScriptBlockText|contains:
             - 'Remove-SmbShare'
             - 'Remove-FileShare'
-    condition: selection
+    filter_main_module_load:
+        ScriptBlockText|contains|all:
+            - 'FileShare.cdxml'
+            - 'Microsoft.PowerShell.Core\Export-ModuleMember'
+            - 'ROOT/Microsoft/Windows/Storage/MSFT_FileShare'
+            - 'ObjectModelWrapper'
+            - 'Cmdletization.MethodParameter'
+    condition: selection and not 1 of filter_main_*
 falsepositives:
     - Administrators or Power users may remove their shares via cmd line
 level: medium