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

description: |
    'Detects when new authentication token is created for service account.'
kind: Scheduled
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])  
requiredDataConnectors:
- connectorId: GCPIAMDataConnector
  dataTypes:
  - GCP_IAM
version: 1.0.2
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: service_account
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
  entityType: IP
triggerOperator: gt
id: 80e4db30-5636-4fbd-8816-24c3ded8d243
triggerThreshold: 0
tactics:
- LateralMovement
name: GCP IAM - New Authentication Token for Service Account
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml
status: Available
queryFrequency: 1h
queryPeriod: 1h
relevantTechniques:
- T1550
severity: Medium

ARM