Suspicious Browser Child Process - MacOS

detection:
  filter_main_chrome:
    CommandLine|contains:
      - '/Volumes/Google Chrome/Google Chrome.app/Contents/Frameworks/*/Resources/install.sh'
      - '/Applications/Google Chrome.app/Contents/Frameworks/Google Chrome Framework.framework/*/Resources/keystone_promote_preflight.sh'
      - '/Applications/Google Chrome.app/Contents/Frameworks/Google Chrome Framework.framework/*/Resources/keystone_promote_postflight.sh'
    ParentImage|contains:
      - 'Google Chrome Helper'
      - 'Google Chrome'
  filter_main_chromerecovery:
    CommandLine|contains|all:
      - '/Users/'
      - '/Library/Application Support/Google/Chrome/recovery/'
      - '/ChromeRecovery'
    ParentImage|contains:
      - 'Google Chrome Helper'
      - 'Google Chrome'
  filter_main_generic:
    CommandLine|contains: '--defaults-torrc'
  filter_main_ms_autoupdate:
    CommandLine|contains: '/Library/Application Support/Microsoft/MAU*/Microsoft AutoUpdate.app/Contents/MacOS/msupdate'
  filter_main_ms_edge:
    CommandLine|contains:
      - 'IOPlatformExpertDevice'
      - 'hw.model'
    ParentImage|contains: 'Microsoft Edge'
  filter_optional_empty:
    CommandLine: ''
  filter_optional_null:
    CommandLine: null
  selection:
    Image|endswith:
      - '/bash'
      - '/curl'
      - '/dash'
      - '/ksh'
      - '/osascript'
      - '/perl'
      - '/php'
      - '/pwsh'
      - '/python'
      - '/sh'
      - '/tcsh'
      - '/wget'
      - '/zsh'
    ParentImage|contains:
      - 'com.apple.WebKit.WebContent'
      - 'firefox'
      - 'Google Chrome Helper'
      - 'Google Chrome'
      - 'Microsoft Edge'
      - 'Opera'
      - 'Safari'
      - 'Tor Browser'
  condition: selection and not 1 of filter_main_* 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 Sohan G (D4rkCiph3r), 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.

None of the everyday examples and documented commands on CmdID’s program pages trips it. To see whether a command line does, paste it into CmdID.