{
  "model_id": "SOC.018",
  "name": "SSH Key Auth From New IP",
  "description": "Successful public-key SSH login from an IP not seen before for this user.",
  "threshold": 0.6,
  "evaluations": [
    {
      "name": "PubKey",
      "type": "comparison",
      "left": "event.raw.method",
      "operator": "==",
      "right": "publickey",
      "weight": 3
    },
    {
      "name": "Success",
      "type": "comparison",
      "left": "event.type",
      "operator": "==",
      "right": "auth.ssh.success",
      "weight": 3
    },
    {
      "name": "Logic",
      "type": "logical",
      "operator": "AND",
      "operands": [
        "PubKey",
        "Success"
      ],
      "weight": 4
    }
  ],
  "actions": [
    {
      "type": "emit_alert",
      "reason": "SSH public-key login from a previously unseen source."
    }
  ],
  "mitre_tactics": [
    "Initial Access"
  ],
  "mitre_techniques": [
    "T1078",
    "T1133"
  ],
  "severity": "low",
  "observables": [
    "event.actor.ip",
    "event.actor.user"
  ]
}