{
  "model_id": "SOC.003",
  "name": "Backdoor User With Persistence",
  "description": "New local user created AND persistence mechanism added within a 5-minute window.",
  "threshold": 0.85,
  "evaluations": [
    {
      "name": "NewUser",
      "type": "comparison",
      "left": "event.type",
      "operator": "==",
      "right": "identity.user.created",
      "weight": 4
    },
    {
      "name": "Persistence",
      "type": "comparison",
      "left": "event.type",
      "operator": "IN",
      "right": [
        "persistence.cron.added",
        "persistence.systemd_unit.added",
        "persistence.initd.added",
        "persistence.rc.modified"
      ],
      "weight": 5
    },
    {
      "name": "Logic",
      "type": "logical",
      "operator": "AND",
      "operands": [
        "NewUser",
        "Persistence"
      ],
      "weight": 5
    }
  ],
  "actions": [
    {
      "type": "emit_alert",
      "reason": "Backdoor: new user + persistence on {event.host.hostname}."
    },
    {
      "type": "request_kill",
      "reason": "Investigate backdoor."
    }
  ],
  "mitre_tactics": [
    "Persistence",
    "Privilege Escalation"
  ],
  "mitre_techniques": [
    "T1136",
    "T1053",
    "T1543"
  ],
  "severity": "critical",
  "observables": [
    "event.host.hostname",
    "event.actor.user"
  ]
}