GCP IAM - New Authentication Token for Service Account

GCP_IAM
| where PayloadMethodname =~ 'google.iam.admin.v1.GenerateAccessToken'
| extend result = parse_json(todynamic(PayloadAuthorizationinfo))[0]['granted']
| where result =~ 'true'
| extend service_account = extract(@'serviceAccounts\/(.*?)@', 1, PayloadResponseName)
| project-away result
| extend timestamp = TimeGenerated, AccountCustomEntity = service_account, IPCustomEntity = SrcIpAddr

kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml
severity: Medium
name: GCP IAM - New Authentication Token for Service Account
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
relevantTechniques:
- T1550
queryFrequency: 1h
triggerThreshold: 0
queryPeriod: 1h
description: |
    'Detects when new authentication token is created for service account.'
id: 80e4db30-5636-4fbd-8816-24c3ded8d243
version: 1.0.0
tactics:
- LateralMovement
query: |
  GCP_IAM
  | where PayloadMethodname =~ 'google.iam.admin.v1.GenerateAccessToken'
  | extend result = parse_json(todynamic(PayloadAuthorizationinfo))[0]['granted']
  | where result =~ 'true'
  | extend service_account = extract(@'serviceAccounts\/(.*?)@', 1, PayloadResponseName)
  | project-away result
  | extend timestamp = TimeGenerated, AccountCustomEntity = service_account, IPCustomEntity = SrcIpAddr  
status: Available
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/80e4db30-5636-4fbd-8816-24c3ded8d243')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/80e4db30-5636-4fbd-8816-24c3ded8d243')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "GCP IAM - New Authentication Token for Service Account",
        "description": "'Detects when new authentication token is created for service account.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "GCP_IAM\n| where PayloadMethodname =~ 'google.iam.admin.v1.GenerateAccessToken'\n| extend result = parse_json(todynamic(PayloadAuthorizationinfo))[0]['granted']\n| where result =~ 'true'\n| extend service_account = extract(@'serviceAccounts\\/(.*?)@', 1, PayloadResponseName)\n| project-away result\n| extend timestamp = TimeGenerated, AccountCustomEntity = service_account, IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "LateralMovement"
        ],
        "techniques": [
          "T1550"
        ],
        "alertRuleTemplateName": "80e4db30-5636-4fbd-8816-24c3ded8d243",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml",
        "status": "Available",
        "templateVersion": "1.0.0"
      }
    }
  ]
}