GCP IAM - New Authentication Token for Service Account

id: 80e4db30-5636-4fbd-8816-24c3ded8d243
name: GCP IAM - New Authentication Token for Service Account
description: |
  'Detects when new authentication token is created for service account.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: GCPIAMDataConnector
    dataTypes:
      - GCP_IAM
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - LateralMovement
relevantTechniques:
  - T1550
query: |
  GCP_IAM
  | where PayloadMethodname in ('GenerateAccessToken', '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 AccountName = tostring(split(service_account, "@")[0]), AccountUPNSuffix = tostring(split(service_account, "@")[1])
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: service_account
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: AccountUPNSuffix
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SrcIpAddr
version: 1.0.2
kind: Scheduled