Process Memory Dump Via Comsvcs.DLL

detection:
  selection_cli_1:
    CommandLine|contains:
      - '#-'
      - '#+'
      - '#24'
      - '24 '
      - 'MiniDump'
      - '#65560'
    CommandLine|contains|all:
      - 'comsvcs'
      - 'full'
  selection_generic:
    CommandLine|contains:
      - ' #'
      - ',#'
      - ', #'
      - '"#'
    CommandLine|contains|all:
      - '24'
      - 'comsvcs'
      - 'full'
  selection_img:
    - Image|endswith: '\rundll32.exe'
    - OriginalFileName: 'RUNDLL32.EXE'
    - CommandLine|contains: 'rundll32'
  condition: (selection_img and 1 of selection_cli_*) or selection_generic

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), Modexp, Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel (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 comsvcs.dll trip it: each is on its program’s page, read by CmdID.