GCP IAM - New Authentication Token for Service Account

Back


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	1.0.1
Arm template	80e4db30-5636-4fbd-8816-24c3ded8d243.json

KQL

GCP_IAM
| where PayloadMethodname =~ '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.'
tactics:
- LateralMovement
version: 1.0.1
query: |
  GCP_IAM
  | where PayloadMethodname =~ '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])  
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMNewAuthenticationToken.yaml
queryPeriod: 1h
id: 80e4db30-5636-4fbd-8816-24c3ded8d243
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
triggerThreshold: 0
name: GCP IAM - New Authentication Token for Service Account
kind: Scheduled
status: Available
relevantTechniques:
- T1550
entityMappings:
- fieldMappings:
  - columnName: service_account
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: SrcIpAddr
    identifier: Address
  entityType: IP
queryFrequency: 1h

ARM