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

name: GCP IAM - Service Account Keys Enumeration
queryPeriod: 12h
queryFrequency: 12h
kind: Scheduled
id: 7ad3cfed-18c0-44af-9e9d-9fb5472a2321
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
triggerOperator: gt
description: |
    'Detects possible service account keys enumeration.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMServiceAccountKeysEnumeration.yaml
status: Available
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
triggerThreshold: 0
severity: Low
version: 1.0.1
tactics:
- Discovery
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  
relevantTechniques:
- T1069

ARM