GCP IAM - Service Account Keys Enumeration

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Id	7ad3cfed-18c0-44af-9e9d-9fb5472a2321
Rulename	GCP IAM - Service Account Keys Enumeration
Description	Detects possible service account keys enumeration.
Severity	Low
Tactics	Discovery
Techniques	T1069
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/GCPIAMServiceAccountKeysEnumeration.yaml
Version	1.0.1
Arm template	7ad3cfed-18c0-44af-9e9d-9fb5472a2321.json

KQL

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

YAML

version: 1.0.1
tactics:
- Discovery
relevantTechniques:
- T1069
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
triggerThreshold: 0
name: GCP IAM - Service Account Keys Enumeration
queryFrequency: 12h
triggerOperator: gt
kind: Scheduled
description: |
    'Detects possible service account keys enumeration.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMServiceAccountKeysEnumeration.yaml
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
severity: Low
query: |
  let threshold = 5;
  GCP_IAM
  | where PayloadMethodname =~ 'google.iam.admin.v1.ListServiceAccountKeys'
  | summarize count() by PayloadAuthenticationinfoPrincipalemail, bin(TimeGenerated, 1h)
  | where count_ > threshold
  | extend AccountCustomEntity = PayloadAuthenticationinfoPrincipalemail  
queryPeriod: 12h
id: 7ad3cfed-18c0-44af-9e9d-9fb5472a2321
status: Available

ARM