NordPass - User deletes items in bulk

NordPassEventLogs_CL
| where action == "items_deleted" and event_type == "item_delete"
| extend item_count = array_length(todynamic(metadata).items)
| summarize total_items = sum(item_count) by user_email
| where total_items >= 10

tactics:
- Impact
- Collection
name: NordPass - User deletes items in bulk
id: f72f630f-c890-49fe-b747-80f4fb3b6348
requiredDataConnectors:
- connectorId: NordPass
  dataTypes:
  - NordPassEventLogs_CL
query: |
  NordPassEventLogs_CL
  | where action == "items_deleted" and event_type == "item_delete"
  | extend item_count = array_length(todynamic(metadata).items)
  | summarize total_items = sum(item_count) by user_email
  | where total_items >= 10  
relevantTechniques:
- T1485
- T1074
incidentConfiguration:
  createIncident: false
description: |
  This will alert you if a user deletes items in bulk, namely, more than 10 items or in the span of 10 minutes. 
  If a mix of bulk and one-off deletions were performed, this will group all actions and report the total number of items deleted.  
triggerOperator: gt
queryPeriod: 10m
severity: High
entityMappings:
- fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: user_email
  entityType: Mailbox
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NordPass/Analytics Rules/nordpass_items_bulk_delete.yaml
version: 1.0.0
triggerThreshold: 0
queryFrequency: 5m
kind: Scheduled
displayName: User deletes items in bulk
customDetails:
  ItemCount: total_items
  User: user_email

{
  "$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/f72f630f-c890-49fe-b747-80f4fb3b6348')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f72f630f-c890-49fe-b747-80f4fb3b6348')]",
      "properties": {
        "alertRuleTemplateName": "f72f630f-c890-49fe-b747-80f4fb3b6348",
        "customDetails": {
          "ItemCount": "total_items",
          "User": "user_email"
        },
        "description": "This will alert you if a user deletes items in bulk, namely, more than 10 items or in the span of 10 minutes. \nIf a mix of bulk and one-off deletions were performed, this will group all actions and report the total number of items deleted.\n",
        "displayName": "NordPass - User deletes items in bulk",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Mailbox",
            "fieldMappings": [
              {
                "columnName": "user_email",
                "identifier": "MailboxPrimaryAddress"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": false
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NordPass/Analytics Rules/nordpass_items_bulk_delete.yaml",
        "query": "NordPassEventLogs_CL\n| where action == \"items_deleted\" and event_type == \"item_delete\"\n| extend item_count = array_length(todynamic(metadata).items)\n| summarize total_items = sum(item_count) by user_email\n| where total_items >= 10\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT10M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection",
          "Impact"
        ],
        "techniques": [
          "T1074",
          "T1485"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}