GCP IAM - New Authentication Token for Service Account

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Id	80e4db30-5636-4fbd-8816-24c3ded8d243
Rulename	GCP IAM - New Authentication Token for Service Account
Description	Detects when new authentication token is created for service account.
Severity	Medium
Tactics	LateralMovement
Techniques	T1550
Required data connectors	GCPIAMDataConnector
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml
Version	1.0.2
Arm template	80e4db30-5636-4fbd-8816-24c3ded8d243.json

KQL

GCP_IAM
| where PayloadMethodname in ('GenerateAccessToken', 'google.iam.admin.v1.GenerateAccessToken')
| extend result = parse_json(todynamic(PayloadAuthorizationinfo))[0]['granted']
| where result =~ 'true'
| extend service_account = extract(@'serviceAccounts\/(.*?)@', 1, PayloadResponseName)
| project-away result
| extend AccountName = tostring(split(service_account, "@")[0]), AccountUPNSuffix = tostring(split(service_account, "@")[1])

YAML

name: GCP IAM - New Authentication Token for Service Account
id: 80e4db30-5636-4fbd-8816-24c3ded8d243
description: |
    'Detects when new authentication token is created for service account.'
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: service_account
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: SrcIpAddr
    identifier: Address
  entityType: IP
version: 1.0.2
triggerOperator: gt
query: |
  GCP_IAM
  | where PayloadMethodname in ('GenerateAccessToken', 'google.iam.admin.v1.GenerateAccessToken')
  | extend result = parse_json(todynamic(PayloadAuthorizationinfo))[0]['granted']
  | where result =~ 'true'
  | extend service_account = extract(@'serviceAccounts\/(.*?)@', 1, PayloadResponseName)
  | project-away result
  | extend AccountName = tostring(split(service_account, "@")[0]), AccountUPNSuffix = tostring(split(service_account, "@")[1])  
tactics:
- LateralMovement
kind: Scheduled
queryFrequency: 1h
severity: Medium
queryPeriod: 1h
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml
relevantTechniques:
- T1550

ARM