VMware ESXi - Multiple VMs stopped

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Id	5fe1af14-cd40-48ff-b581-3a12a1f90785
Rulename	VMware ESXi - Multiple VMs stopped
Description	Detects when multiple VMs ware stopped by user.
Severity	Medium
Tactics	Impact
Techniques	T1529
Required data connectors	SyslogAma
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/ESXiMultipleVMStopped.yaml
Version	1.0.3
Arm template	5fe1af14-cd40-48ff-b581-3a12a1f90785.json

KQL

let threshold = 5;
VMwareESXi
| where SyslogMessage has ('VmPoweredOffEvent')
| extend SrcUsername = extract(@'\[info\]\s+\[(.*?)\]', 1, SyslogMessage)
| extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
| summarize st_vm = make_set(DstHostname,200) by SrcUsername, bin(TimeGenerated, 5m)
| where array_length(st_vm) > threshold
| extend hostname = iff(array_length(st_vm) > 0, st_vm[0], "")
| extend NTDomain = tostring(split(hostname, '\\', 0)[0]), Name = tostring(split(SrcUsername, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0]), DnsDomain = tostring(split(SrcUsername, '\\', 1)[0])

YAML

name: VMware ESXi - Multiple VMs stopped
relevantTechniques:
- T1529
id: 5fe1af14-cd40-48ff-b581-3a12a1f90785
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiMultipleVMStopped.yaml
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
version: 1.0.3
severity: Medium
triggerThreshold: 0
queryPeriod: 1h
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: DnsDomain
    columnName: DnsDomain
  entityType: Account
- fieldMappings:
  - identifier: HostName
    columnName: HostName
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Host
queryFrequency: 1h
status: Available
query: |
  let threshold = 5;
  VMwareESXi
  | where SyslogMessage has ('VmPoweredOffEvent')
  | extend SrcUsername = extract(@'\[info\]\s+\[(.*?)\]', 1, SyslogMessage)
  | extend DstHostname = extract(@'\[\d+\]\s+\[(.*?)\s+on', 1, SyslogMessage)
  | summarize st_vm = make_set(DstHostname,200) by SrcUsername, bin(TimeGenerated, 5m)
  | where array_length(st_vm) > threshold
  | extend hostname = iff(array_length(st_vm) > 0, st_vm[0], "")
  | extend NTDomain = tostring(split(hostname, '\\', 0)[0]), Name = tostring(split(SrcUsername, '\\', 1)[0]), HostName = tostring(split(hostname, '.', 0)[0]), DnsDomain = tostring(split(SrcUsername, '\\', 1)[0])  
tactics:
- Impact
kind: Scheduled
description: |
    'Detects when multiple VMs ware stopped by user.'
triggerOperator: gt

ARM