CmdID / Rules / Windows

PUA - NirCmd Execution

A Sigma rule for process creation on Windows, by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems).

medium 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it

detection:
  combo_exec:
    CommandLine|contains:
      - ' exec '
      - ' exec2 '
  combo_exec_params:
    CommandLine|contains:
      - ' show '
      - ' hide '
  selection_cmd:
    CommandLine|contains:
      - ' execmd '
      - '.exe script '
      - '.exe shexec '
      - ' runinteractive '
  selection_org:
    - Image|endswith: '\NirCmd.exe'
    - OriginalFileName: 'NirCmd.exe'
  condition: 1 of selection_* or all of combo_*

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), 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.

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.

ATT&CK

the techniques it is tagged with

T1569.002System Services: Service Execution

PUA - NirCmd Execution

What it looks for

ATT&CK

Other rules for T1569.002 System Services: Service Execution