Dataverse - Mass deletion of records

let mass_delete_threshold = 10000;
let query_frequency = 1d;
let delete_activities = DataverseActivity
    | where TimeGenerated >= ago(query_frequency)
    | where Message == "Delete";
union
    (
    delete_activities
    | summarize FirstEvent = min(TimeGenerated), TotalEvents = count() by UserId, InstanceUrl
    | where TotalEvents > mass_delete_threshold
    | join kind=inner (
        delete_activities
        | summarize DeleteCount = count() by UserId, InstanceUrl, ClientIp, EntityName)
        on UserId, InstanceUrl
    | extend Entities = bag_pack("Entity", EntityName, "Count", DeleteCount)
    | summarize Details = make_set(Entities, 100), FirstEvent = min(FirstEvent) by UserId, InstanceUrl, ClientIp, TotalEvents
    ),
    (
    DataverseActivity
    | where TimeGenerated >= ago(query_frequency)
    | where Message == "BulkDelete"
    | summarize FirstEvent = min(TimeGenerated), TotalEvents = count() by UserId, InstanceUrl, ClientIp
    | extend Details = todynamic("Bulk delete scheduled")
    )
| extend
    CloudAppId = int(32780),
    AccountName = tostring(split(UserId, '@')[0]),
    UPNSuffix = tostring(split(UserId, '@')[1])
| project
    FirstEvent,
    UserId,
    ClientIp,
    TotalEvents,
    Details,
    InstanceUrl,
    CloudAppId,
    AccountName,
    UPNSuffix

queryPeriod: 14d
query: |
  let mass_delete_threshold = 10000;
  let query_frequency = 1d;
  let delete_activities = DataverseActivity
      | where TimeGenerated >= ago(query_frequency)
      | where Message == "Delete";
  union
      (
      delete_activities
      | summarize FirstEvent = min(TimeGenerated), TotalEvents = count() by UserId, InstanceUrl
      | where TotalEvents > mass_delete_threshold
      | join kind=inner (
          delete_activities
          | summarize DeleteCount = count() by UserId, InstanceUrl, ClientIp, EntityName)
          on UserId, InstanceUrl
      | extend Entities = bag_pack("Entity", EntityName, "Count", DeleteCount)
      | summarize Details = make_set(Entities, 100), FirstEvent = min(FirstEvent) by UserId, InstanceUrl, ClientIp, TotalEvents
      ),
      (
      DataverseActivity
      | where TimeGenerated >= ago(query_frequency)
      | where Message == "BulkDelete"
      | summarize FirstEvent = min(TimeGenerated), TotalEvents = count() by UserId, InstanceUrl, ClientIp
      | extend Details = todynamic("Bulk delete scheduled")
      )
  | extend
      CloudAppId = int(32780),
      AccountName = tostring(split(UserId, '@')[0]),
      UPNSuffix = tostring(split(UserId, '@')[1])
  | project
      FirstEvent,
      UserId,
      ClientIp,
      TotalEvents,
      Details,
      InstanceUrl,
      CloudAppId,
      AccountName,
      UPNSuffix  
version: 3.2.0
name: Dataverse - Mass deletion of records
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: CloudAppId
    identifier: AppId
  - columnName: InstanceUrl
    identifier: InstanceName
  entityType: CloudApplication
- fieldMappings:
  - columnName: ClientIp
    identifier: Address
  entityType: IP
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Business Applications/Analytic Rules/Dataverse - Mass deletion of records.yaml
alertDetailsOverride:
  alertDisplayNameFormat: 'Dataverse - mass deletion or bulk deletion job detected in {{InstanceUrl}} '
  alertDescriptionFormat: '{{UserId}} triggered the mass deletion detection with the following information: {{Details}}'
description: Identifies large scale record delete operations based on a predefined threshold and also detects scheduled bulk deletion jobs.
kind: Scheduled
status: Available
severity: Medium
requiredDataConnectors:
- connectorId: Dataverse
  dataTypes:
  - DataverseActivity
triggerOperator: gt
triggerThreshold: 0
tactics:
- Impact
id: 716cf6d4-97ad-407b-923e-6790083acb58
relevantTechniques:
- T1485