VMware ESXi - Multiple new VMs started
Id | bdea247f-7d17-498c-ac0e-c7e764cbdbbe |
Rulename | VMware ESXi - Multiple new VMs started |
Description | Detects when multiple new VMs were started. |
Severity | Medium |
Tactics | InitialAccess |
Techniques | T1078 |
Required data connectors | SyslogAma VMwareESXi |
Kind | Scheduled |
Query frequency | 1h |
Query period | 1h |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleNewVM.yaml |
Version | 1.0.2 |
Arm template | bdea247f-7d17-498c-ac0e-c7e764cbdbbe.json |
let threshold = 5;
let a_vm =
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize vm_l = make_set(DstHostname,200)
| 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 = make_set(DstHostname,200) by SrcUsername, bin(TimeGenerated, 10m)
| where array_length(n_vm) >= threshold
| extend hostname = iff(array_length(n_vm) > 0, n_vm[0], "")
| extend NTDomain = tostring(split(hostname, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0])
kind: Scheduled
relevantTechniques:
- T1078
description: |
'Detects when multiple new VMs were started.'
queryPeriod: 1h
queryFrequency: 1h
tactics:
- InitialAccess
name: VMware ESXi - Multiple new VMs started
requiredDataConnectors:
- connectorId: VMwareESXi
dataTypes:
- VMwareESXi
- connectorId: SyslogAma
datatypes:
- Syslog
entityMappings:
- entityType: Host
fieldMappings:
- identifier: HostName
columnName: HostName
- identifier: NTDomain
columnName: NTDomain
triggerThreshold: 0
version: 1.0.2
id: bdea247f-7d17-498c-ac0e-c7e764cbdbbe
query: |
let threshold = 5;
let a_vm =
VMwareESXi
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize vm_l = make_set(DstHostname,200)
| 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 = make_set(DstHostname,200) by SrcUsername, bin(TimeGenerated, 10m)
| where array_length(n_vm) >= threshold
| extend hostname = iff(array_length(n_vm) > 0, n_vm[0], "")
| extend NTDomain = tostring(split(hostname, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0])
status: Available
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleNewVM.yaml
severity: Medium
{
"$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/bdea247f-7d17-498c-ac0e-c7e764cbdbbe')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bdea247f-7d17-498c-ac0e-c7e764cbdbbe')]",
"properties": {
"alertRuleTemplateName": "bdea247f-7d17-498c-ac0e-c7e764cbdbbe",
"customDetails": null,
"description": "'Detects when multiple new VMs were started.'\n",
"displayName": "VMware ESXi - Multiple new VMs started",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleNewVM.yaml",
"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 = make_set(DstHostname,200)\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 = make_set(DstHostname,200) by SrcUsername, bin(TimeGenerated, 10m)\n| where array_length(n_vm) >= threshold\n| extend hostname = iff(array_length(n_vm) > 0, n_vm[0], \"\")\n| extend NTDomain = tostring(split(hostname, '\\\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0])\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1078"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}