Filter Driver Unloaded Via Fltmc.EXE

detection:
  filter_optional_avira:
    CommandLine|endswith:
      - 'unload rtp_filesystem_filter'
      - 'unload rtp_filter'
    ParentImage|contains:
      - '\AppData\Local\Temp\'
      - ':\Windows\Temp\'
    ParentImage|endswith: '\endpoint-protection-installer-x64.tmp'
  filter_optional_manageengine:
    CommandLine|endswith: 'unload DFMFilter'
    ParentImage: 'C:\Program Files (x86)\ManageEngine\uems_agent\bin\dcfaservice64.exe'
  selection_cli:
    CommandLine|contains: 'unload'
  selection_img:
    - Image|endswith: '\fltMC.exe'
    - OriginalFileName: 'fltMC.exe'
  condition: all of 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 Nasreddine Bencherchali (Nextron Systems), 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 fltmc.exe trip it: each is on its program’s page, read by CmdID.