VMware ESXi - Low temp directory space

let threshold = 10;
VMwareESXi
| where SyslogMessage has_all ('Temp directory', 'free space')
| extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
| where sp < threshold
| extend h = 'Hypervisor'
| extend HostCustomEntity = h

relevantTechniques:
- T1529
name: VMware ESXi - Low temp directory space
requiredDataConnectors:
- dataTypes:
  - VMwareESXi
  connectorId: VMwareESXi
- datatypes:
  - Syslog
  connectorId: SyslogAma
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
  entityType: Host
triggerThreshold: 0
id: 2ee727f7-b7c2-4034-b6c9-d245d5a29343
tactics:
- Impact
version: 1.0.1
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowTempDirSpace.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'This rule is triggered when temp directory space is detected.'
query: |
  let threshold = 10;
  VMwareESXi
  | where SyslogMessage has_all ('Temp directory', 'free space')
  | extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
  | where sp < threshold
  | extend h = 'Hypervisor'
  | extend HostCustomEntity = h  
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/2ee727f7-b7c2-4034-b6c9-d245d5a29343')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2ee727f7-b7c2-4034-b6c9-d245d5a29343')]",
      "properties": {
        "alertRuleTemplateName": "2ee727f7-b7c2-4034-b6c9-d245d5a29343",
        "customDetails": null,
        "description": "'This rule is triggered when temp directory space is detected.'\n",
        "displayName": "VMware ESXi - Low temp directory space",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowTempDirSpace.yaml",
        "query": "let threshold = 10;\nVMwareESXi\n| where SyslogMessage has_all ('Temp directory', 'free space')\n| extend sp = toreal(extract(@'free space is:\\s(\\d+)', 1, SyslogMessage)) / 1000000000\n| where sp < threshold\n| extend h = 'Hypervisor'\n| extend HostCustomEntity = h\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1529"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}