Potential Dosfuscation Activity

A Sigma rule for process creation on Windows, by frack113, Nasreddine Bencherchali (Nextron Systems).

medium 1 ATT&CK technique 1 everyday example trips it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection:
    CommandLine|contains:
      - '^^'
      - '^|^'
      - ',;,'
      - ';;;;'
      - ';; ;;'
      - '(,(,'
      - '%COMSPEC:~'
      - ' c^m^d'
      - '^c^m^d'
      - ' c^md'
      - ' cm^d'
      - '^cm^d'
      - ' s^et '
      - ' s^e^t '
      - ' se^t '
  condition: 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 frack113, 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.

Command lines that trip it

everyday examples from tldr-pages, CC BY 4.0, each read by CmdID

To set the value TEST^1 for the environment variable named testVar, type on the page for set

set testVar=TEST^^1Identify

ATT&CK

the techniques it is tagged with

T1059Command and Scripting Interpreter

Potential Dosfuscation Activity

What it looks for

Command lines that trip it

ATT&CK

Other rules for T1059 Command and Scripting Interpreter