Unusual identity creation using exchange powershell

(union isfuzzy=true
(SecurityEvent
| where EventID==4688
| where CommandLine has_any ("New-Mailbox","Update-RoleGroupMember") and CommandLine has "HealthMailbox55x2yq"
| project TimeGenerated, HostCustomEntity = Computer, AccountCustomEntity = Account, AccountDomain, ProcessName, ProcessNameFullPath = NewProcessName, EventID, Activity, CommandLine, EventSourceName, Type
),
(DeviceProcessEvents
| where ProcessCommandLine has_any ("New-Mailbox","Update-RoleGroupMember") and ProcessCommandLine has "HealthMailbox55x2yq"
| extend timestamp = TimeGenerated, AccountCustomEntity =  InitiatingProcessAccountName, HostCustomEntity = DeviceName
)
)

id: 0a3f4f4f-46ad-4562-acd6-f17730a5aef4
queryFrequency: 12h
version: 1.0.1
requiredDataConnectors:
- connectorId: SecurityEvents
  dataTypes:
  - SecurityEvent
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceProcessEvents
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: HostCustomEntity
    identifier: FullName
  entityType: Host
kind: Scheduled
queryPeriod: 12h
severity: High
query: |
  (union isfuzzy=true
  (SecurityEvent
  | where EventID==4688
  | where CommandLine has_any ("New-Mailbox","Update-RoleGroupMember") and CommandLine has "HealthMailbox55x2yq"
  | project TimeGenerated, HostCustomEntity = Computer, AccountCustomEntity = Account, AccountDomain, ProcessName, ProcessNameFullPath = NewProcessName, EventID, Activity, CommandLine, EventSourceName, Type
  ),
  (DeviceProcessEvents
  | where ProcessCommandLine has_any ("New-Mailbox","Update-RoleGroupMember") and ProcessCommandLine has "HealthMailbox55x2yq"
  | extend timestamp = TimeGenerated, AccountCustomEntity =  InitiatingProcessAccountName, HostCustomEntity = DeviceName
  )
  )  
metadata:
  categories:
    domains:
    - Security - Threat Protection
    - Identity
  author:
    name: Ajeet Prakash
  support:
    tier: Community
  source:
    kind: Community
triggerOperator: gt
tags:
- Europium
description: |
  ' The query below identifies creation of unusual identity by the Europium actor to mimic Microsoft Exchange Health Manager Service account using Exchange PowerShell commands
    Reference: https://www.microsoft.com/security/blog/2022/09/08/microsoft-investigates-iranian-attacks-against-the-albanian-government/'  
triggerThreshold: 0
name: Unusual identity creation using exchange powershell
relevantTechniques:
- T1136
tactics:
- Persistence
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/EuropiumUnusualIdentity.yaml

{
  "$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/0a3f4f4f-46ad-4562-acd6-f17730a5aef4')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0a3f4f4f-46ad-4562-acd6-f17730a5aef4')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Unusual identity creation using exchange powershell",
        "description": "' The query below identifies creation of unusual identity by the Europium actor to mimic Microsoft Exchange Health Manager Service account using Exchange PowerShell commands\n  Reference: https://www.microsoft.com/security/blog/2022/09/08/microsoft-investigates-iranian-attacks-against-the-albanian-government/'\n",
        "severity": "High",
        "enabled": true,
        "query": "(union isfuzzy=true\n(SecurityEvent\n| where EventID==4688\n| where CommandLine has_any (\"New-Mailbox\",\"Update-RoleGroupMember\") and CommandLine has \"HealthMailbox55x2yq\"\n| project TimeGenerated, HostCustomEntity = Computer, AccountCustomEntity = Account, AccountDomain, ProcessName, ProcessNameFullPath = NewProcessName, EventID, Activity, CommandLine, EventSourceName, Type\n),\n(DeviceProcessEvents\n| where ProcessCommandLine has_any (\"New-Mailbox\",\"Update-RoleGroupMember\") and ProcessCommandLine has \"HealthMailbox55x2yq\"\n| extend timestamp = TimeGenerated, AccountCustomEntity =  InitiatingProcessAccountName, HostCustomEntity = DeviceName\n)\n)\n",
        "queryFrequency": "PT12H",
        "queryPeriod": "PT12H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1136"
        ],
        "alertRuleTemplateName": "0a3f4f4f-46ad-4562-acd6-f17730a5aef4",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "HostCustomEntity"
              }
            ]
          }
        ],
        "tags": [
          "Europium"
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/EuropiumUnusualIdentity.yaml",
        "templateVersion": "1.0.1"
      }
    }
  ]
}