Sigma medium test sigma

Linux Shell Pipe to Shell

Detects suspicious process command line that starts with a shell that executes something and finally gets piped into another shell

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Detection Logic

{
  "selection": {
    "CommandLine
| startswith": [
      "sh -c ",
      "bash -c "
    ]
  },
  "selection_exec": [
    {
      "CommandLine
| contains": [
        "
| bash ",
        "
| sh ",
        "
| bash ",
        "
| sh "
      ]
    },
    {
      "CommandLine
| endswith": [
        "
| bash",
        "
| sh",
        "
| bash",
        "
| sh"
      ]
    }
  ],
  "condition": "all of selection*"
}

False Positives

⚠ Legitimate software that uses these patterns

Field Validations

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