Dataverse - Executable uploaded to SharePoint document management site

let file_extensions = dynamic(['com', 'exe', 'bat', 'cmd', 'vbs', 'vbe', 'js', 'jse', 'wsf', 'wsh', 'msc', 'cpl', 'ps1', 'scr']);
let query_frequency = 1h;
DataverseSharePointSites
| join kind=inner (
    OfficeActivity
    | where TimeGenerated >= ago(query_frequency)
    | where OfficeWorkload == "SharePoint" and Operation == "FileUploaded")
    on $left.SharePointUrl == $right.Site_Url
| where SourceFileExtension in (file_extensions)
| extend
    CloudAppId = int(32780),
    SharePointId = int(20892),
    AccountName = tostring(split(UserId, '@')[0]),
    UPNSuffix = tostring(split(UserId, '@')[1])
| project
    TimeGenerated,
    UserId,
    ClientIP,
    InstanceUrl,
    SourceFileName,
    SharePointUrl,
    CloudAppId,
    SharePointId,
    AccountName,
    UPNSuffix

queryPeriod: 14d
description: Identifies executable files and scripts uploaded to SharePoint sites used for Dynamics document management, circumventing native file extension restrictions in Dataverse.
name: Dataverse - Executable uploaded to SharePoint document management site
id: ba5e608f-7879-4927-8b0d-a9948b4fe6f3
severity: Low
alertDetailsOverride:
  alertDisplayNameFormat: Dataverse - Executable files uploaded in document management for {{InstanceUrl}}
  alertDescriptionFormat: Executable/script {{SourceFileName}} was uploaded by {{UserId}} in SharePoint site {{SharePointUrl}}
queryFrequency: 1h
version: 3.2.0
tactics:
- Execution
- Persistence
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Executable uploaded to SharePoint document management site.yaml
relevantTechniques:
- T0863
- T0873
requiredDataConnectors:
- dataTypes:
  - OfficeActivity (SharePoint)
  connectorId: Office365
query: |
  let file_extensions = dynamic(['com', 'exe', 'bat', 'cmd', 'vbs', 'vbe', 'js', 'jse', 'wsf', 'wsh', 'msc', 'cpl', 'ps1', 'scr']);
  let query_frequency = 1h;
  DataverseSharePointSites
  | join kind=inner (
      OfficeActivity
      | where TimeGenerated >= ago(query_frequency)
      | where OfficeWorkload == "SharePoint" and Operation == "FileUploaded")
      on $left.SharePointUrl == $right.Site_Url
  | where SourceFileExtension in (file_extensions)
  | extend
      CloudAppId = int(32780),
      SharePointId = int(20892),
      AccountName = tostring(split(UserId, '@')[0]),
      UPNSuffix = tostring(split(UserId, '@')[1])
  | project
      TimeGenerated,
      UserId,
      ClientIP,
      InstanceUrl,
      SourceFileName,
      SharePointUrl,
      CloudAppId,
      SharePointId,
      AccountName,
      UPNSuffix  
status: Available
eventGroupingSettings:
  aggregationKind: SingleAlert
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: ClientIP
  entityType: IP
- fieldMappings:
  - identifier: AppId
    columnName: CloudAppId
  - identifier: InstanceName
    columnName: InstanceUrl
  entityType: CloudApplication
- fieldMappings:
  - identifier: Name
    columnName: SourceFileName
  entityType: File
- fieldMappings:
  - identifier: AppId
    columnName: SharePointId
  - identifier: InstanceName
    columnName: SharePointUrl
  entityType: CloudApplication
triggerOperator: gt
kind: Scheduled

{
  "$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/ba5e608f-7879-4927-8b0d-a9948b4fe6f3')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ba5e608f-7879-4927-8b0d-a9948b4fe6f3')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Executable/script {{SourceFileName}} was uploaded by {{UserId}} in SharePoint site {{SharePointUrl}}",
          "alertDisplayNameFormat": "Dataverse - Executable files uploaded in document management for {{InstanceUrl}}"
        },
        "alertRuleTemplateName": "ba5e608f-7879-4927-8b0d-a9948b4fe6f3",
        "customDetails": null,
        "description": "Identifies executable files and scripts uploaded to SharePoint sites used for Dynamics document management, circumventing native file extension restrictions in Dataverse.",
        "displayName": "Dataverse - Executable uploaded to SharePoint document management site",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "ClientIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "CloudAppId",
                "identifier": "AppId"
              },
              {
                "columnName": "InstanceUrl",
                "identifier": "InstanceName"
              }
            ]
          },
          {
            "entityType": "File",
            "fieldMappings": [
              {
                "columnName": "SourceFileName",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "SharePointId",
                "identifier": "AppId"
              },
              {
                "columnName": "SharePointUrl",
                "identifier": "InstanceName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Executable uploaded to SharePoint document management site.yaml",
        "query": "let file_extensions = dynamic(['com', 'exe', 'bat', 'cmd', 'vbs', 'vbe', 'js', 'jse', 'wsf', 'wsh', 'msc', 'cpl', 'ps1', 'scr']);\nlet query_frequency = 1h;\nDataverseSharePointSites\n| join kind=inner (\n    OfficeActivity\n    | where TimeGenerated >= ago(query_frequency)\n    | where OfficeWorkload == \"SharePoint\" and Operation == \"FileUploaded\")\n    on $left.SharePointUrl == $right.Site_Url\n| where SourceFileExtension in (file_extensions)\n| extend\n    CloudAppId = int(32780),\n    SharePointId = int(20892),\n    AccountName = tostring(split(UserId, '@')[0]),\n    UPNSuffix = tostring(split(UserId, '@')[1])\n| project\n    TimeGenerated,\n    UserId,\n    ClientIP,\n    InstanceUrl,\n    SourceFileName,\n    SharePointUrl,\n    CloudAppId,\n    SharePointId,\n    AccountName,\n    UPNSuffix\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution",
          "Persistence"
        ],
        "techniques": null,
        "templateVersion": "3.2.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}