Uncommon Assistive Technology Applications Execution Via AtBroker.EXE

detection:
  filter_main_builtin:
    CommandLine|contains:
      - 'animations'
      - 'audiodescription'
      - 'caretbrowsing'
      - 'caretwidth'
      - 'colorfiltering'
      - 'cursorindicator'
      - 'cursorscheme'
      - 'filterkeys'
      - 'focusborderheight'
      - 'focusborderwidth'
      - 'highcontrast'
      - 'keyboardcues'
      - 'keyboardpref'
      - 'livecaptions'
      - 'magnifierpane'
      - 'messageduration'
      - 'minimumhitradius'
      - 'mousekeys'
      - 'Narrator'
      - 'osk'
      - 'overlappedcontent'
      - 'showsounds'
      - 'soundsentry'
      - 'speechreco'
      - 'stickykeys'
      - 'togglekeys'
      - 'voiceaccess'
      - 'windowarranging'
      - 'windowtracking'
      - 'windowtrackingtimeout'
      - 'windowtrackingzorder'
  filter_optional_java:
    CommandLine|contains: 'Oracle_JavaAccessBridge'
  selection_cli:
    CommandLine|contains: 'start'
  selection_img:
    - Image|endswith: '\AtBroker.exe'
    - OriginalFileName: 'AtBroker.exe'
  condition: all of 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 Mateusz Wydra, oscd.community, 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.

The commands LOLBAS or GTFOBins documents for atbroker.exe trip it: each is on its program’s page, read by CmdID.