GSA Enriched Office 365 - Multiple Teams deleted by a single user

// Set the maximum number of deleted teams to flag suspicious activity
let max_delete_count = 3;
// EnrichedMicrosoft365AuditLogs Query
let EnrichedEvents = EnrichedMicrosoft365AuditLogs
    | where Workload =~ "MicrosoftTeams"
    | where Operation =~ "TeamDeleted"
    | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(tostring(AdditionalProperties.TeamName), 1000) by UserId
    | where array_length(DeletedTeams) > max_delete_count
    | extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1]);
// OfficeActivity Query
let OfficeEvents = OfficeActivity
    | where OfficeWorkload =~ "MicrosoftTeams"
    | where Operation =~ "TeamDeleted"
    | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(TeamName, 1000) by UserId
    | where array_length(DeletedTeams) > max_delete_count
    | extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1]);
// Combine and Deduplicate Office and Enriched Logs
let CombinedEvents = OfficeEvents
    | union EnrichedEvents
    | summarize arg_min(StartTime, *) by UserId;
// Final Output
CombinedEvents
    | project StartTime, EndTime, DeletedTeams, UserId, AccountName, AccountUPNSuffix

relevantTechniques:
- T1485
- T1489
name: GSA Enriched Office 365 - Multiple Teams deleted by a single user
requiredDataConnectors:
- dataTypes:
  - EnrichedMicrosoft365AuditLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - OfficeActivity (Teams)
  connectorId: Office365
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: UserId
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  entityType: Account
triggerThreshold: 0
id: db60e4b6-a845-4f28-a18c-94ebbaad6c6c
tactics:
- Impact
version: 2.0.6
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/Office 365 - MultipleTeamsDeletes.yaml
queryPeriod: 1d
kind: Scheduled
queryFrequency: 1d
severity: Low
status: Available
description: |
  This detection flags the occurrences of deleting multiple teams within a day.
  This data is a part of Office 365 Connector in Microsoft Sentinel.  
query: |
  // Set the maximum number of deleted teams to flag suspicious activity
  let max_delete_count = 3;
  // EnrichedMicrosoft365AuditLogs Query
  let EnrichedEvents = EnrichedMicrosoft365AuditLogs
      | where Workload =~ "MicrosoftTeams"
      | where Operation =~ "TeamDeleted"
      | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(tostring(AdditionalProperties.TeamName), 1000) by UserId
      | where array_length(DeletedTeams) > max_delete_count
      | extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1]);
  // OfficeActivity Query
  let OfficeEvents = OfficeActivity
      | where OfficeWorkload =~ "MicrosoftTeams"
      | where Operation =~ "TeamDeleted"
      | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(TeamName, 1000) by UserId
      | where array_length(DeletedTeams) > max_delete_count
      | extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1]);
  // Combine and Deduplicate Office and Enriched Logs
  let CombinedEvents = OfficeEvents
      | union EnrichedEvents
      | summarize arg_min(StartTime, *) by UserId;
  // Final Output
  CombinedEvents
      | project StartTime, EndTime, DeletedTeams, UserId, AccountName, AccountUPNSuffix  
triggerOperator: gt

{
  "$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/db60e4b6-a845-4f28-a18c-94ebbaad6c6c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/db60e4b6-a845-4f28-a18c-94ebbaad6c6c')]",
      "properties": {
        "alertRuleTemplateName": "db60e4b6-a845-4f28-a18c-94ebbaad6c6c",
        "customDetails": null,
        "description": "This detection flags the occurrences of deleting multiple teams within a day.\nThis data is a part of Office 365 Connector in Microsoft Sentinel.\n",
        "displayName": "GSA Enriched Office 365 - Multiple Teams deleted by a single user",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserId",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/Office 365 - MultipleTeamsDeletes.yaml",
        "query": "// Set the maximum number of deleted teams to flag suspicious activity\nlet max_delete_count = 3;\n// EnrichedMicrosoft365AuditLogs Query\nlet EnrichedEvents = EnrichedMicrosoft365AuditLogs\n    | where Workload =~ \"MicrosoftTeams\"\n    | where Operation =~ \"TeamDeleted\"\n    | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(tostring(AdditionalProperties.TeamName), 1000) by UserId\n    | where array_length(DeletedTeams) > max_delete_count\n    | extend AccountName = tostring(split(UserId, \"@\")[0]), AccountUPNSuffix = tostring(split(UserId, \"@\")[1]);\n// OfficeActivity Query\nlet OfficeEvents = OfficeActivity\n    | where OfficeWorkload =~ \"MicrosoftTeams\"\n    | where Operation =~ \"TeamDeleted\"\n    | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), DeletedTeams = make_set(TeamName, 1000) by UserId\n    | where array_length(DeletedTeams) > max_delete_count\n    | extend AccountName = tostring(split(UserId, \"@\")[0]), AccountUPNSuffix = tostring(split(UserId, \"@\")[1]);\n// Combine and Deduplicate Office and Enriched Logs\nlet CombinedEvents = OfficeEvents\n    | union EnrichedEvents\n    | summarize arg_min(StartTime, *) by UserId;\n// Final Output\nCombinedEvents\n    | project StartTime, EndTime, DeletedTeams, UserId, AccountName, AccountUPNSuffix\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1485",
          "T1489"
        ],
        "templateVersion": "2.0.6",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}