MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Google Workspace | login_failure: Login Failure |
| Google Workspace | login_failure: SAML Login Failure |
Rule body
id: 8f6cd9a4-5e57-11ec-bf63-0242ac130002
name: GWorkspace - Possible brute force attack
description: |
'Detects possible brute force attack.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: GoogleWorkspaceReportsAPI
dataTypes:
- GWorkspaceActivityReports
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
relevantTechniques:
- T1110
query: |
let threshold = 5;
GWorkspaceActivityReports
| where EventMessage has "login_failure"
| summarize login_attempts = count() by ActorEmail, bin(TimeGenerated, 5m)
| where login_attempts > threshold
| extend AccountCustomEntity = ActorEmail
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
version: 1.0.1
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 5;
Stage 1: source
GWorkspaceActivityReports
Stage 2: where
| where EventMessage has "login_failure"
Stage 3: summarize
| summarize login_attempts = count() by ActorEmail, bin(TimeGenerated, 5m)
Stage 4: where
| where login_attempts > threshold
Stage 5: extend
| extend AccountCustomEntity = ActorEmail
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventMessage | match |
| field:"EventMessage" kind:match value:"login_failure" |
login_attempts | gt |
| field:"login_attempts" kind:gt value:"5" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
ActorEmail | summarize |
login_attempts | summarize |
AccountCustomEntity | extend |