GCP IAM - Service Account Enumeration

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Id	50e0437e-912d-4cd0-ac19-fef0aebdd3d7
Rulename	GCP IAM - Service Account Enumeration
Description	Detects possible service account enumeration.
Severity	Low
Tactics	Discovery
Techniques	T1087
Required data connectors	GCPIAMDataConnector
Kind	Scheduled
Query frequency	12h
Query period	12h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMServiceAccountEnumeration.yaml
Version	1.0.0
Arm template	50e0437e-912d-4cd0-ac19-fef0aebdd3d7.json

KQL

let threshold = 5;
GCP_IAM
| where PayloadMethodname =~ 'google.iam.admin.v1.ListServiceAccounts'
| summarize count() by PayloadAuthenticationinfoPrincipalemail, bin(TimeGenerated, 1h)
| where count_ > threshold
| extend AccountCustomEntity = PayloadAuthenticationinfoPrincipalemail

YAML

name: GCP IAM - Service Account Enumeration
id: 50e0437e-912d-4cd0-ac19-fef0aebdd3d7
description: |
    'Detects possible service account enumeration.'
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
version: 1.0.0
triggerOperator: gt
query: |
  let threshold = 5;
  GCP_IAM
  | where PayloadMethodname =~ 'google.iam.admin.v1.ListServiceAccounts'
  | summarize count() by PayloadAuthenticationinfoPrincipalemail, bin(TimeGenerated, 1h)
  | where count_ > threshold
  | extend AccountCustomEntity = PayloadAuthenticationinfoPrincipalemail  
tactics:
- Discovery
kind: Scheduled
queryFrequency: 12h
severity: Low
queryPeriod: 12h
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMServiceAccountEnumeration.yaml
relevantTechniques:
- T1087

ARM