{
  "model_id": "SOC.090",
  "name": "Disk Fill Attack",
  "description": "Disk usage exceeded 95% — could be legitimate or a disk-fill DoS.",
  "threshold": 0.8,
  "evaluations": [
    {
      "name": "Metric",
      "type": "comparison",
      "left": "event.type",
      "operator": "==",
      "right": "host.metric",
      "weight": 2
    },
    {
      "name": "DiskFull",
      "type": "comparison",
      "left": "event.raw.disk_used_pct",
      "operator": "\u003e",
      "right": 95,
      "weight": 5
    },
    {
      "name": "Logic",
      "type": "logical",
      "operator": "AND",
      "operands": [
        "Metric",
        "DiskFull"
      ],
      "weight": 5
    }
  ],
  "actions": [
    {
      "type": "emit_alert",
      "reason": "Disk \u003e95% full on {event.host.hostname} — possible disk-fill attack."
    }
  ],
  "mitre_tactics": [
    "Impact"
  ],
  "mitre_techniques": [
    "T1499",
    "T1561"
  ],
  "severity": "high",
  "observables": [
    "event.host.hostname"
  ]
}