VIP Mailbox manipulation

let VIPRestriction = "on";
ExchangeAdminAuditLogs
| where IsVIP or VIPRestriction =~ "off"
| where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)
| extend Level = iif (Status == "Failure", "Medium", "High")

relevantTechniques:
- T1020
- T1098
- T1114
name: VIP Mailbox manipulation
requiredDataConnectors:
- dataTypes:
  - Event
  connectorId: ESI-ExchangeAdminAuditLogEvents
entityMappings:
- fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: TargetObject
  entityType: Mailbox
- fieldMappings:
  - identifier: FullName
    columnName: Computer
  entityType: Host
- fieldMappings:
  - identifier: Sid
    columnName: TargetObject
  - identifier: ObjectGuid
    columnName: TargetObject
  - identifier: FullName
    columnName: TargetObject
  entityType: Account
- fieldMappings:
  - identifier: Name
    columnName: Caller
  entityType: Account
triggerThreshold: 0
id: 5170c3c4-b8c9-485c-910d-a21d965ee181
tactics:
- Exfiltration
- Persistence
- Collection
version: 1.2.0
alertDetailsOverride:
  alertDisplayNameFormat: '{{CmdletName}} executed on {{TargetObject}}'
  alertSeverityColumnName: Level
  alertDescriptionFormat: Alert from Microsoft Exchange Security as {{CmdletName}} with parameters {{CmdletParameters}} was executed on {{TargetObject}}
queryPeriod: 1h
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Exchange Security - Exchange On-Premises/Analytic Rules/CriticalCmdletsUsageDetection.yaml
queryFrequency: 30m
severity: Medium
status: Available
description: |
    'Alert if a cmdlet that can be translated to data exfiltration or mailbox access is executed on a VIP Mailbox.'
query: |
  let VIPRestriction = "on";
  ExchangeAdminAuditLogs
  | where IsVIP or VIPRestriction =~ "off"
  | where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)
  | extend Level = iif (Status == "Failure", "Medium", "High")  
triggerOperator: gt

{
  "$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/5170c3c4-b8c9-485c-910d-a21d965ee181')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/5170c3c4-b8c9-485c-910d-a21d965ee181')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Alert from Microsoft Exchange Security as {{CmdletName}} with parameters {{CmdletParameters}} was executed on {{TargetObject}}",
          "alertDisplayNameFormat": "{{CmdletName}} executed on {{TargetObject}}",
          "alertSeverityColumnName": "Level"
        },
        "alertRuleTemplateName": "5170c3c4-b8c9-485c-910d-a21d965ee181",
        "customDetails": null,
        "description": "'Alert if a cmdlet that can be translated to data exfiltration or mailbox access is executed on a VIP Mailbox.'\n",
        "displayName": "VIP Mailbox manipulation",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Mailbox",
            "fieldMappings": [
              {
                "columnName": "TargetObject",
                "identifier": "MailboxPrimaryAddress"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "TargetObject",
                "identifier": "Sid"
              },
              {
                "columnName": "TargetObject",
                "identifier": "ObjectGuid"
              },
              {
                "columnName": "TargetObject",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Caller",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Exchange Security - Exchange On-Premises/Analytic Rules/CriticalCmdletsUsageDetection.yaml",
        "query": "let VIPRestriction = \"on\";\nExchangeAdminAuditLogs\n| where IsVIP or VIPRestriction =~ \"off\"\n| where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)\n| extend Level = iif (Status == \"Failure\", \"Medium\", \"High\")\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Exfiltration",
          "Persistence"
        ],
        "techniques": [
          "T1020",
          "T1098",
          "T1114"
        ],
        "templateVersion": "1.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}