Detectionmediumtest
PSScriptPolicyTest Creation By Uncommon Process
Detects the creation of the "PSScriptPolicyTest" PowerShell script by an uncommon process. This file is usually generated by Microsoft Powershell to test against Applocker.
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Launch
Nasreddine Bencherchali (Nextron Systems)Created Thu Jun 01Updated Tue Oct 071027d292-dd87-4a1a-8701-2abe04d7783cwindows
Log Source
WindowsFile Event
ProductWindows← raw: windows
CategoryFile Event← raw: file_event
Events for file system activity including creation, modification, and deletion.
Detection Logic
Detection Logic4 selectors
detection:
selection:
TargetFilename|contains: '__PSScriptPolicyTest_'
filter_main_powershell:
Image:
- 'C:\Program Files\PowerShell\7-preview\pwsh.exe'
- 'C:\Program Files\PowerShell\7\pwsh.exe'
- 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell_ise.exe'
- 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe'
- 'C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell_ise.exe'
- 'C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe'
filter_main_pwsh_preview:
Image|contains:
- 'C:\Program Files\WindowsApps\Microsoft.PowerShellPreview'
- '\AppData\Local\Microsoft\WindowsApps\Microsoft.PowerShellPreview'
Image|endswith: '\pwsh.exe'
filter_main_generic:
Image:
- 'C:\Windows\System32\dsac.exe'
- 'C:\Windows\System32\sdiagnhost.exe'
- 'C:\Windows\System32\ServerManager.exe'
- 'C:\Windows\System32\wsmprovhost.exe'
- 'C:\Windows\SysWOW64\sdiagnhost.exe'
condition: selection and not 1 of filter_main_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Rule Metadata
Rule ID
1027d292-dd87-4a1a-8701-2abe04d7783c
Status
test
Level
medium
Type
Detection
Created
Thu Jun 01
Modified
Tue Oct 07
Path
rules/windows/file/file_event/file_event_win_ps_script_policy_test_creation_by_uncommon_process.yml
Raw Tags
attack.defense-evasion