CmdID / Rules / Windows

Potential Pikabot Infection - Suspicious Command Combinations Via Cmd.EXE

A Sigma rule for process creation on Windows, from SigmaHQ’s emerging threats rules, by Alejandro Houspanossian ('@lekz86').

medium 3 ATT&CK techniques

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_cmd:
    CommandLine|contains|all:
      - 'cmd'
      - '/c'
  selection_commands_1:
    CommandLine|contains:
      - ' curl'
      - ' wget'
      - ' timeout '
      - ' ping '
  selection_commands_2:
    CommandLine|contains:
      - ' rundll32'
      - ' mkdir '
  selection_pipes:
    CommandLine|contains:
      - ' & '
      - ' || '
  condition: all of selection_*

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 Alejandro Houspanossian ('@lekz86'), 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

T1059.003Command and Scripting Interpreter: Windows Command Shell

T1105Ingress Tool Transfer

T1218System Binary Proxy Execution

Potential Pikabot Infection - Suspicious Command Combinations Via Cmd.EXE

What it looks for

ATT&CK

Other rules for T1059.003 Command and Scripting Interpreter: Windows Command Shell