CmdID

CmdID / Rules / Windows

HackTool - RemoteKrbRelay Execution

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

high 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it
detection:
  selection_cli_attack_addgrpname:
    CommandLine|contains|all:
      - '-addgroupmember '
      - '-group '
      - '-groupuser '
  selection_cli_attack_changepass:
    CommandLine|contains: '-chp '
    CommandLine|contains|all:
      - '-chpPass '
      - '-chpUser '
  selection_cli_attack_rbcd_main:
    CommandLine|contains: '-rbcd '
  selection_cli_attack_rbcd_options:
    CommandLine|contains:
      - '-cn '
      - '--computername '
  selection_cli_attack_smb:
    CommandLine|contains:
      - 'interactive'
      - 'secrets'
      - 'service-add'
    CommandLine|contains|all:
      - '-smb '
      - '--smbkeyword '
  selection_cli_required:
    CommandLine|contains|all:
      - ' -clsid '
      - ' -target '
      - ' -victim '
  selection_img:
    - Image|endswith: '\RemoteKrbRelay.exe'
    - OriginalFileName: 'RemoteKrbRelay.exe'
  condition: selection_img or selection_cli_required or all of selection_cli_attack_rbcd_* or selection_cli_attack_changepass or selection_cli_attack_addgrpname or selection_cli_attack_smb

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.

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
T1558.003Steal or Forge Kerberos Tickets: Kerberoasting