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

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

ARM