{
  "model_id": "SOC.053",
  "name": "Log File Deleted Or Modified",
  "description": "Any file under /var/log/ deleted or written — attacker attempting to clear forensic trail.",
  "threshold": 0.7,
  "evaluations": [
    {
      "name": "LogEvent",
      "type": "comparison",
      "left": "event.type",
      "operator": "IN",
      "right": [
        "file.remove",
        "file.critical.write",
        "file.write"
      ],
      "weight": 3
    },
    {
      "name": "LogPath",
      "type": "comparison",
      "left": "event.raw.path",
      "operator": "LIKE",
      "right": "/var/log/%",
      "weight": 5
    },
    {
      "name": "Logic",
      "type": "logical",
      "operator": "AND",
      "operands": [
        "LogEvent",
        "LogPath"
      ],
      "weight": 5
    }
  ],
  "actions": [
    {
      "type": "emit_alert",
      "reason": "Log file tampered: {event.raw.path} — possible anti-forensics."
    }
  ],
  "mitre_tactics": [
    "Defense Evasion"
  ],
  "mitre_techniques": [
    "T1070.002"
  ],
  "severity": "high",
  "observables": [
    "event.raw.path"
  ]
}