SAP BTP - Mass user deletion in Cloud Identity Service

let bulk_delete_threshold = 10;
SAPBTPAuditLog_CL
| extend data_s = tostring(Message.data)
| extend action = extract(@"action=""([^""]+)""", 1, data_s),
         objectType = extract(@"objectType=""([^""]+)""", 1, data_s),
         impactedUser = extract(@"serviceProviderName=""([^""]+)""", 1, data_s)
| where action == "delete"
| where objectType == "authorization"
| where isnotempty(impactedUser)
| summarize
    Start = min(UpdatedOn),
    End = max(UpdatedOn),
    DeleteCount = count(),
    DeletedUsers = make_set(impactedUser, 100)
    by UserName, Tenant, SpaceId
| where array_length(DeletedUsers) > bulk_delete_threshold
| project Start, End, UserName, DeletedUsers, DeleteCount, Tenant, SpaceId, CloudApp = "SAP BTP"
| extend AccountName = split(UserName, "@")[0], UPNSuffix = split(UserName, "@")[1]

name: SAP BTP - Mass user deletion in Cloud Identity Service
triggerOperator: gt
kind: Scheduled
queryFrequency: 1h
description: Identifies mass user deletion activity in SAP Cloud Identity Service where the amount of deleted users exceeds a predefined threshold.
id: a3b8e7c4-5f2d-4a1e-9c6b-8d7f3e2a1b0c
triggerThreshold: 0
queryPeriod: 1h
query: |
  let bulk_delete_threshold = 10;
  SAPBTPAuditLog_CL
  | extend data_s = tostring(Message.data)
  | extend action = extract(@"action=""([^""]+)""", 1, data_s),
           objectType = extract(@"objectType=""([^""]+)""", 1, data_s),
           impactedUser = extract(@"serviceProviderName=""([^""]+)""", 1, data_s)
  | where action == "delete"
  | where objectType == "authorization"
  | where isnotempty(impactedUser)
  | summarize
      Start = min(UpdatedOn),
      End = max(UpdatedOn),
      DeleteCount = count(),
      DeletedUsers = make_set(impactedUser, 100)
      by UserName, Tenant, SpaceId
  | where array_length(DeletedUsers) > bulk_delete_threshold
  | project Start, End, UserName, DeletedUsers, DeleteCount, Tenant, SpaceId, CloudApp = "SAP BTP"
  | extend AccountName = split(UserName, "@")[0], UPNSuffix = split(UserName, "@")[1]
version: 3.0.1
status: Available
eventGroupingSettings:
  aggregationKind: SingleAlert
severity: Medium
requiredDataConnectors:
- connectorId: SAPBTPAuditEvents
  dataTypes:
  - SAPBTPAuditLog_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SAP%20BTP/Analytic%20Rules/BTP%20-%20Mass%20user%20deletion%20in%20Cloud%20Identity%20Service.yaml
relevantTechniques:
- T1531
- T1485
- T1489
- T0813
- T0826
- T0827
tactics:
- Impact
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Name
    columnName: CloudApp
  entityType: CloudApplication

{
  "$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/a3b8e7c4-5f2d-4a1e-9c6b-8d7f3e2a1b0c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a3b8e7c4-5f2d-4a1e-9c6b-8d7f3e2a1b0c')]",
      "properties": {
        "alertRuleTemplateName": "a3b8e7c4-5f2d-4a1e-9c6b-8d7f3e2a1b0c",
        "customDetails": null,
        "description": "Identifies mass user deletion activity in SAP Cloud Identity Service where the amount of deleted users exceeds a predefined threshold.",
        "displayName": "SAP BTP - Mass user deletion in Cloud Identity Service",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "CloudApp",
                "identifier": "Name"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SAP%20BTP/Analytic%20Rules/BTP%20-%20Mass%20user%20deletion%20in%20Cloud%20Identity%20Service.yaml",
        "query": "let bulk_delete_threshold = 10;\nSAPBTPAuditLog_CL\n| extend data_s = tostring(Message.data)\n| extend action = extract(@\"action=\"\"([^\"\"]+)\"\"\", 1, data_s),\n         objectType = extract(@\"objectType=\"\"([^\"\"]+)\"\"\", 1, data_s),\n         impactedUser = extract(@\"serviceProviderName=\"\"([^\"\"]+)\"\"\", 1, data_s)\n| where action == \"delete\"\n| where objectType == \"authorization\"\n| where isnotempty(impactedUser)\n| summarize\n    Start = min(UpdatedOn),\n    End = max(UpdatedOn),\n    DeleteCount = count(),\n    DeletedUsers = make_set(impactedUser, 100)\n    by UserName, Tenant, SpaceId\n| where array_length(DeletedUsers) > bulk_delete_threshold\n| project Start, End, UserName, DeletedUsers, DeleteCount, Tenant, SpaceId, CloudApp = \"SAP BTP\"\n| extend AccountName = split(UserName, \"@\")[0], UPNSuffix = split(UserName, \"@\")[1]\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1485",
          "T1489",
          "T1531"
        ],
        "templateVersion": "3.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}