VMware ESXi - Dormant VM started

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Id	4cdcd5d8-89df-4076-a917-bc50abb9f2ab
Rulename	VMware ESXi - Dormant VM started
Description	Detects when dormant VM was started.
Severity	Medium
Tactics	InitialAccess
Techniques	T1190
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiDormantVMStarted.yaml
Version	1.0.3
Arm template	4cdcd5d8-89df-4076-a917-bc50abb9f2ab.json

KQL

let vm_p_off =
VMwareESXi
| where TimeGenerated > ago(14d)
| where SyslogMessage has ('VmPoweredOffEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize LastPowerOffTime=max(TimeGenerated) by DstHostname
| where datetime_diff('day',datetime(now),LastPowerOffTime) >= 20; 
let vm_p_on =
VMwareESXi
| where TimeGenerated > ago(14d)
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize LastPowerOnTime=max(TimeGenerated) by DstHostname
| where datetime_diff('day',datetime(now),LastPowerOnTime) >= 20;
let off_vms =
vm_p_on
| join (vm_p_off) on DstHostname
| where LastPowerOffTime > LastPowerOnTime
| summarize p_off_vm = make_set(DstHostname,200)
| extend k=1;
VMwareESXi
| where TimeGenerated between (ago(24h) .. datetime(now))
| where SyslogMessage has ('VmPoweredOnEvent')
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| extend k=1
| join (off_vms) on k
| where p_off_vm !has DstHostname
| summarize rec_p_on = make_set(DstHostname,200)
| extend hostname = iff(array_length(rec_p_on) > 0, rec_p_on[0], "")
| extend NTDomain = tostring(split(hostname, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0])

YAML

queryPeriod: 14d
query: |
  let vm_p_off =
  VMwareESXi
  | where TimeGenerated > ago(14d)
  | where SyslogMessage has ('VmPoweredOffEvent')
  | extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
  | summarize LastPowerOffTime=max(TimeGenerated) by DstHostname
  | where datetime_diff('day',datetime(now),LastPowerOffTime) >= 20; 
  let vm_p_on =
  VMwareESXi
  | where TimeGenerated > ago(14d)
  | where SyslogMessage has ('VmPoweredOnEvent')
  | extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
  | summarize LastPowerOnTime=max(TimeGenerated) by DstHostname
  | where datetime_diff('day',datetime(now),LastPowerOnTime) >= 20;
  let off_vms =
  vm_p_on
  | join (vm_p_off) on DstHostname
  | where LastPowerOffTime > LastPowerOnTime
  | summarize p_off_vm = make_set(DstHostname,200)
  | extend k=1;
  VMwareESXi
  | where TimeGenerated between (ago(24h) .. datetime(now))
  | where SyslogMessage has ('VmPoweredOnEvent')
  | extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
  | extend k=1
  | join (off_vms) on k
  | where p_off_vm !has DstHostname
  | summarize rec_p_on = make_set(DstHostname,200)
  | extend hostname = iff(array_length(rec_p_on) > 0, rec_p_on[0], "")
  | extend NTDomain = tostring(split(hostname, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0])  
name: VMware ESXi - Dormant VM started
entityMappings:
- fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: NTDomain
    identifier: NTDomain
  entityType: Host
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiDormantVMStarted.yaml
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
description: |
    'Detects when dormant VM was started.'
kind: Scheduled
version: 1.0.3
queryFrequency: 1h
severity: Medium
relevantTechniques:
- T1190
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: 4cdcd5d8-89df-4076-a917-bc50abb9f2ab

ARM