Detection rules › Kusto
GCP IAM - Service Account Enumeration
Detects possible service account enumeration.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Discovery |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| GCP | google.iam.admin.ListServiceAccounts: ListServiceAccounts |
Rule body
id: 50e0437e-912d-4cd0-ac19-fef0aebdd3d7
name: GCP IAM - Service Account Enumeration
description: |
'Detects possible service account enumeration.'
severity: Low
status: Available
requiredDataConnectors:
- connectorId: GCPIAMDataConnector
dataTypes:
- GCP_IAM
queryFrequency: 12h
queryPeriod: 12h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Discovery
relevantTechniques:
- T1087
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
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
version: 1.0.0
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 5;
Stage 1: source
GCP_IAM
Stage 2: where
| where PayloadMethodname =~ 'google.iam.admin.v1.ListServiceAccounts'
Stage 3: summarize
| summarize count() by PayloadAuthenticationinfoPrincipalemail, bin(TimeGenerated, 1h)
Stage 4: where
| where count_ > threshold
Stage 5: extend
| extend AccountCustomEntity = PayloadAuthenticationinfoPrincipalemail
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
PayloadMethodname | eq |
| field:"gcp::method_name" kind:eq value:"google.iam.admin.v1.ListServiceAccounts" |
count_ | gt |
| field:"count_" kind:gt value:"5" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
PayloadAuthenticationinfoPrincipalemail | summarize |
AccountCustomEntity | extend |