Tailscale Mass credential revocation in short window

Tailscale_Audit_CL
      | where Action in ("REVOKE", "DELETE")
      | where tostring(Target.type) in ("API_KEY", "OAUTH_CLIENT", "AUTH_KEY")
      | extend ActorLogin = tostring(Actor.loginName)
      | summarize
          RevokedCount = count(),
          TargetTypes = make_set(tostring(Target.type)),
          TargetIds = make_set(tostring(Target.id)),
          FirstEvent = min(TimeGenerated),
          LastEvent = max(TimeGenerated)
        by ActorLogin, bin(TimeGenerated, 1h)
      | where RevokedCount >= 5
      | project TimeGenerated = LastEvent, ActorLogin, RevokedCount, TargetTypes, TargetIds, FirstEvent, LastEvent

version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tailscale%20%28CCF%29/Analytic%20Rules/TailscaleMasscredentialrevocationinshortwindow.yaml
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - Tailscale_Audit_CL
  connectorId: TailscaleCCF
tactics:
- DefenseEvasion
- Impact
relevantTechniques:
- T1070
kind: Scheduled
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    reopenClosedIncident: false
    enabled: true
  createIncident: true
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: ActorLogin
  entityType: Account
description: |
  Identifies when five or more API keys, OAuth clients, or auth keys are revoked or deleted within one hour. May be routine rotation, or a typical cleanup pattern after credential compromise.
triggerOperator: gt
status: Available
queryFrequency: 1h
id: f817e2fa-6fa0-fc25-5369-cef9b58771af
name: 'Tailscale: Mass credential revocation in short window'
severity: High
query: |
  Tailscale_Audit_CL
        | where Action in ("REVOKE", "DELETE")
        | where tostring(Target.type) in ("API_KEY", "OAUTH_CLIENT", "AUTH_KEY")
        | extend ActorLogin = tostring(Actor.loginName)
        | summarize
            RevokedCount = count(),
            TargetTypes = make_set(tostring(Target.type)),
            TargetIds = make_set(tostring(Target.id)),
            FirstEvent = min(TimeGenerated),
            LastEvent = max(TimeGenerated)
          by ActorLogin, bin(TimeGenerated, 1h)
        | where RevokedCount >= 5
        | project TimeGenerated = LastEvent, ActorLogin, RevokedCount, TargetTypes, TargetIds, FirstEvent, LastEvent
queryPeriod: 1h

{
  "$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/f817e2fa-6fa0-fc25-5369-cef9b58771af')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f817e2fa-6fa0-fc25-5369-cef9b58771af')]",
      "properties": {
        "alertRuleTemplateName": "f817e2fa-6fa0-fc25-5369-cef9b58771af",
        "customDetails": null,
        "description": "Identifies when five or more API keys, OAuth clients, or auth keys are revoked or deleted within one hour. May be routine rotation, or a typical cleanup pattern after credential compromise.\n",
        "displayName": "Tailscale: Mass credential revocation in short window",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ActorLogin",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tailscale%20%28CCF%29/Analytic%20Rules/TailscaleMasscredentialrevocationinshortwindow.yaml",
        "query": "Tailscale_Audit_CL\n      | where Action in (\"REVOKE\", \"DELETE\")\n      | where tostring(Target.type) in (\"API_KEY\", \"OAUTH_CLIENT\", \"AUTH_KEY\")\n      | extend ActorLogin = tostring(Actor.loginName)\n      | summarize\n          RevokedCount = count(),\n          TargetTypes = make_set(tostring(Target.type)),\n          TargetIds = make_set(tostring(Target.id)),\n          FirstEvent = min(TimeGenerated),\n          LastEvent = max(TimeGenerated)\n        by ActorLogin, bin(TimeGenerated, 1h)\n      | where RevokedCount >= 5\n      | project TimeGenerated = LastEvent, ActorLogin, RevokedCount, TargetTypes, TargetIds, FirstEvent, LastEvent\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Impact"
        ],
        "techniques": [
          "T1070"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}