Potentially Suspicious Powershell Script Execution From Temp Folder

detection:
  filter_optional_amazon_ec2:
    CommandLine|contains: '\Windows\system32\config\systemprofile\AppData\Local\Temp\Amazon\EC2-Windows\'
  filter_optional_chocolatey_installer:
    CommandLine|contains|all:
      - '-NoProfile -ExecutionPolicy Bypass -Command'
      - 'AppData\Local\Temp\'
      - 'Install-Chocolatey.ps1'
    Image|endswith: '\powershell.exe'
    ParentImage:
      - 'C:\Windows\System32\Msiexec.exe'
      - 'C:\Windows\SysWOW64\Msiexec.exe'
  filter_optional_ec2launch:
    CommandLine|contains|all:
      - '\config\systemprofile\AppData\Local\Temp\EC2Launch'
      - '\UserScript.ps1'
    ParentImage|endswith: '\Amazon\EC2Launch\EC2Launch.exe'
  filter_optional_generic:
    CommandLine|contains:
      - ' >'
      - 'Out-File'
      - 'ConvertTo-Json'
  filter_optional_vscode:
    CommandLine|contains: '-WindowStyle hidden -Verb runAs'
  selection:
    CommandLine|contains:
      - '\Windows\Temp'
      - '\Temporary Internet'
      - '\AppData\Local\Temp'
      - '\AppData\Roaming\Temp'
      - '%TEMP%'
      - '%TMP%'
      - '%LocalAppData%\Temp'
    Image|endswith:
      - '\powershell.exe'
      - '\pwsh.exe'
  condition: selection and not 1 of filter_optional_*

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Florian Roth (Nextron Systems), Max Altgelt (Nextron Systems), Tim Shelton, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.