Microsoft Sentinel Analytic Rules
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VMware ESXi - Low temp directory space

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Id2ee727f7-b7c2-4034-b6c9-d245d5a29343
RulenameVMware ESXi - Low temp directory space
DescriptionThis rule is triggered when temp directory space is detected.
SeverityMedium
TacticsImpact
TechniquesT1529
Required data connectorsVMwareESXi
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowTempDirSpace.yaml
Version1.0.0
Arm template2ee727f7-b7c2-4034-b6c9-d245d5a29343.json
Deploy To Azure
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
severity: Medium
triggerThreshold: 0
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  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: VMwareESXi
  dataTypes:
  - VMwareESXi
id: 2ee727f7-b7c2-4034-b6c9-d245d5a29343
version: 1.0.0
name: VMware ESXi - Low temp directory space
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowTempDirSpace.yaml
queryPeriod: 1h
relevantTechniques:
- T1529
triggerOperator: gt
tactics:
- Impact
description: |
    'This rule is triggered when temp directory space is detected.'
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/2ee727f7-b7c2-4034-b6c9-d245d5a29343')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2ee727f7-b7c2-4034-b6c9-d245d5a29343')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "VMware ESXi - Low temp directory space",
        "description": "'This rule is triggered when temp directory space is detected.'\n",
        "severity": "Medium",
        "enabled": true,
        "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",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1529"
        ],
        "alertRuleTemplateName": "2ee727f7-b7c2-4034-b6c9-d245d5a29343",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ],
            "entityType": "Host"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowTempDirSpace.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
    }
  ]
}