{
  "model_id": "SOC.020",
  "name": "Root SSH Login",
  "description": "Direct root login via SSH. Best practice is to disable PermitRootLogin and use sudo.",
  "threshold": 0.6,
  "evaluations": [
    {
      "name": "Success",
      "type": "comparison",
      "left": "event.type",
      "operator": "==",
      "right": "auth.ssh.success",
      "weight": 3
    },
    {
      "name": "RootUser",
      "type": "comparison",
      "left": "event.actor.user",
      "operator": "==",
      "right": "root",
      "weight": 5
    },
    {
      "name": "Logic",
      "type": "logical",
      "operator": "AND",
      "operands": [
        "Success",
        "RootUser"
      ],
      "weight": 5
    }
  ],
  "actions": [
    {
      "type": "emit_alert",
      "reason": "Direct root SSH login — investigate whether PermitRootLogin should be disabled."
    }
  ],
  "mitre_tactics": [
    "Initial Access"
  ],
  "mitre_techniques": [
    "T1078"
  ],
  "severity": "medium",
  "observables": [
    "event.actor.ip"
  ]
}