let threshold = 5;
let a_vm =
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize vm_l = makeset(DstHostname)
| extend k=1;
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| extend SrcUsername = extract(@'\[info\]\s+\[(.*?)\]', 1, SyslogMessage)
| extend k = 1
| join (a_vm) on k
| where vm_l !has DstHostname
| summarize n_vm = makeset(DstHostname) by SrcUsername, bin(TimeGenerated, 10m)
| where array_length(n_vm) >= threshold
| extend HostCustomEntity = n_vm
name: VMware ESXi - Multiple new VMs started
query: |
let threshold = 5;
let a_vm =
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize vm_l = makeset(DstHostname)
| extend k=1;
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| extend SrcUsername = extract(@'\[info\]\s+\[(.*?)\]', 1, SyslogMessage)
| extend k = 1
| join (a_vm) on k
| where vm_l !has DstHostname
| summarize n_vm = makeset(DstHostname) by SrcUsername, bin(TimeGenerated, 10m)
| where array_length(n_vm) >= threshold
| extend HostCustomEntity = n_vm
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleNewVM.yaml
queryFrequency: 1h
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
- VMwareESXi
connectorId: VMwareESXi
version: 1.0.0
status: Available
queryPeriod: 1h
id: bdea247f-7d17-498c-ac0e-c7e764cbdbbe
triggerOperator: gt
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: HostCustomEntity
entityType: Host
relevantTechniques:
- T1078
severity: Medium
description: |
'Detects when multiple new VMs were started.'
kind: Scheduled
tactics:
- InitialAccess
{
"$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/bdea247f-7d17-498c-ac0e-c7e764cbdbbe')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bdea247f-7d17-498c-ac0e-c7e764cbdbbe')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "VMware ESXi - Multiple new VMs started",
"description": "'Detects when multiple new VMs were started.'\n",
"severity": "Medium",
"enabled": true,
"query": "let threshold = 5;\nlet a_vm = \nVMwareESXi\n| where SyslogMessage has ('VmPoweredOnEvent')\n| extend DstHostname = extract(@'\\[\\d+\\]\\s+\\[(.*?)\\s+on', 1, SyslogMessage)\n| summarize vm_l = makeset(DstHostname)\n| extend k=1;\nVMwareESXi\n| where SyslogMessage has ('VmPoweredOnEvent')\n| extend DstHostname = extract(@'\\[\\d+\\]\\s+\\[(.*?)\\s+on', 1, SyslogMessage)\n| extend SrcUsername = extract(@'\\[info\\]\\s+\\[(.*?)\\]', 1, SyslogMessage)\n| extend k = 1\n| join (a_vm) on k\n| where vm_l !has DstHostname\n| summarize n_vm = makeset(DstHostname) by SrcUsername, bin(TimeGenerated, 10m)\n| where array_length(n_vm) >= threshold\n| extend HostCustomEntity = n_vm\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1078"
],
"alertRuleTemplateName": "bdea247f-7d17-498c-ac0e-c7e764cbdbbe",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
],
"entityType": "Host"
}
],
"status": "Available",
"templateVersion": "1.0.0",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleNewVM.yaml"
}
}
]
}