Microsoft Sentinel Analytic Rules
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VMware ESXi - Low patch disk space

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Id48d992ba-d404-4159-a8c6-46f51d1325c7
RulenameVMware ESXi - Low patch disk space
DescriptionThis rule is triggered when low patch disk store 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/ESXiLowPatchDiskSpace.yaml
Version1.0.0
Arm template48d992ba-d404-4159-a8c6-46f51d1325c7.json
Deploy To Azure
let threshold = 100;
VMwareESXi
| where SyslogMessage has ('Patch store disk')
| extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
| where sp < threshold
| extend h = 'Hypervisor'
| extend HostCustomEntity = h
kind: Scheduled
status: Available
triggerThreshold: 0
relevantTechniques:
- T1529
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowPatchDiskSpace.yaml
requiredDataConnectors:
- dataTypes:
  - VMwareESXi
  connectorId: VMwareESXi
queryPeriod: 1h
tactics:
- Impact
severity: Medium
triggerOperator: gt
description: |
    'This rule is triggered when low patch disk store space is detected.'
query: |
  let threshold = 100;
  VMwareESXi
  | where SyslogMessage has ('Patch store disk')
  | extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
  | where sp < threshold
  | extend h = 'Hypervisor'
  | extend HostCustomEntity = h  
name: VMware ESXi - Low patch disk space
version: 1.0.0
id: 48d992ba-d404-4159-a8c6-46f51d1325c7
queryFrequency: 1h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: HostCustomEntity
    identifier: FullName
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/48d992ba-d404-4159-a8c6-46f51d1325c7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/48d992ba-d404-4159-a8c6-46f51d1325c7')]",
      "properties": {
        "alertRuleTemplateName": "48d992ba-d404-4159-a8c6-46f51d1325c7",
        "customDetails": null,
        "description": "'This rule is triggered when low patch disk store space is detected.'\n",
        "displayName": "VMware ESXi - Low patch disk space",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiLowPatchDiskSpace.yaml",
        "query": "let threshold = 100;\nVMwareESXi\n| where SyslogMessage has ('Patch store disk')\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",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1529"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}