GCP IAM - New Service Account Key

GCP_IAM
| where PayloadMethodname =~ 'google.iam.admin.v1.CreateServiceAccountKey'
| 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

relevantTechniques:
- T1550
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewServiceAccountKey.yaml
triggerOperator: gt
kind: Scheduled
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
queryPeriod: 24h
query: |
  GCP_IAM
  | where PayloadMethodname =~ 'google.iam.admin.v1.CreateServiceAccountKey'
  | 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  
version: 1.0.0
description: |
    'Detects new service account key creation.'
tactics:
- LateralMovement
severity: Low
name: GCP IAM - New Service Account Key
queryFrequency: 24h
triggerThreshold: 0
status: Available
id: fc135860-8773-4ead-b5be-9789af1ff8ff

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/fc135860-8773-4ead-b5be-9789af1ff8ff')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/fc135860-8773-4ead-b5be-9789af1ff8ff')]",
      "properties": {
        "alertRuleTemplateName": "fc135860-8773-4ead-b5be-9789af1ff8ff",
        "customDetails": null,
        "description": "'Detects new service account key creation.'\n",
        "displayName": "GCP IAM - New Service Account Key",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewServiceAccountKey.yaml",
        "query": "GCP_IAM\n| where PayloadMethodname =~ 'google.iam.admin.v1.CreateServiceAccountKey'\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": "PT24H",
        "queryPeriod": "PT24H",
        "severity": "Low",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "LateralMovement"
        ],
        "techniques": [
          "T1550"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}