Dataverse - Mass deletion of records

id: 716cf6d4-97ad-407b-923e-6790083acb58
kind: Scheduled
name: Dataverse - Mass deletion of records
description: Identifies large scale record delete operations based on a predefined
  threshold and also detects scheduled bulk deletion jobs.
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: Dataverse
    dataTypes:
      - DataverseActivity
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Impact
relevantTechniques:
  - T1485
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
eventGroupingSettings:
  aggregationKind: AlertPerResult
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: CloudApplication
    fieldMappings:
      - identifier: AppId
        columnName: CloudAppId
      - identifier: InstanceName
        columnName: InstanceUrl
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: ClientIp
alertDetailsOverride:
  alertDisplayNameFormat: 'Dataverse - mass deletion or bulk deletion job detected
    in {{InstanceUrl}} '
  alertDescriptionFormat: '{{UserId}} triggered the mass deletion detection with the
    following information: {{Details}}'
version: 3.2.0