Microsoft Sentinel Analytic Rules
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VMware ESXi - Shared or stolen root account

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Id9c496d6c-42a3-4896-9b6c-00254386928f
RulenameVMware ESXi - Shared or stolen root account
DescriptionDetects when shared or stolen root account.
SeverityHigh
TacticsInitialAccess
PrivilegeEscalation
TechniquesT1078
Required data connectorsVMwareESXi
KindScheduled
Query frequency1h
Query period1h
Trigger threshold1
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiSharedOrStolenRootAccount.yaml
Version1.0.1
Arm template9c496d6c-42a3-4896-9b6c-00254386928f.json
Deploy To Azure
VMwareESXi
| where SyslogMessage has_all ('UserLoginSessionEvent', 'root', 'logged in')
| extend SrcIpAddr = extract(@'root@(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})', 1, SyslogMessage)
| summarize count() by SrcIpAddr, bin(TimeGenerated, 15m)
| where count_ > 1
| extend IPCustomEntity = SrcIpAddr
id: 9c496d6c-42a3-4896-9b6c-00254386928f
name: VMware ESXi - Shared or stolen root account
triggerOperator: gt
status: Available
query: |
  VMwareESXi
  | where SyslogMessage has_all ('UserLoginSessionEvent', 'root', 'logged in')
  | extend SrcIpAddr = extract(@'root@(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})', 1, SyslogMessage)
  | summarize count() by SrcIpAddr, bin(TimeGenerated, 15m)
  | where count_ > 1
  | extend IPCustomEntity = SrcIpAddr  
queryPeriod: 1h
requiredDataConnectors:
- connectorId: VMwareESXi
  dataTypes:
  - VMwareESXi
severity: High
queryFrequency: 1h
relevantTechniques:
- T1078
version: 1.0.1
kind: Scheduled
tactics:
- InitialAccess
- PrivilegeEscalation
triggerThreshold: 1
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiSharedOrStolenRootAccount.yaml
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
description: |
    'Detects when shared or stolen root account.'
{
  "$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/9c496d6c-42a3-4896-9b6c-00254386928f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9c496d6c-42a3-4896-9b6c-00254386928f')]",
      "properties": {
        "alertRuleTemplateName": "9c496d6c-42a3-4896-9b6c-00254386928f",
        "customDetails": null,
        "description": "'Detects when shared or stolen root account.'\n",
        "displayName": "VMware ESXi - Shared or stolen root account",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiSharedOrStolenRootAccount.yaml",
        "query": "VMwareESXi\n| where SyslogMessage has_all ('UserLoginSessionEvent', 'root', 'logged in')\n| extend SrcIpAddr = extract(@'root@(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})', 1, SyslogMessage)\n| summarize count() by SrcIpAddr, bin(TimeGenerated, 15m)\n| where count_ > 1\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 1
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}