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A Sigma rule for process creation on Windows, by Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community.

high 2 ATT&CK techniques

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_1:
    CommandLine|contains:
      - '-Command'
      - '-EncodedCommand'
    CommandLine|contains|all:
      - '-Sta'
      - '-Nop'
      - '-Window'
      - 'Hidden'
  selection_2:
    CommandLine|contains:
      - 'sv o (New-Object IO.MemorySteam);sv d '
      - 'mshta file.hta'
      - 'GruntHTTP'
      - '-EncodedCommand cwB2ACAAbwAgA'
  condition: 1 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 Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community, 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

T1059.001Command and Scripting Interpreter: PowerShell

T1564.003Hide Artifacts: Hidden Window

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What it looks for

ATT&CK

Other rules for T1059.001 Command and Scripting Interpreter: PowerShell