Detection rules › Kusto
GWorkspace - Possible brute force attack
'Detects possible brute force attack.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access | T1110 Brute Force |
Rule body kusto
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
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
EventMessage | match |
|
login_attempts | gt |
|
Output fields
Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.
| Field | Source |
|---|---|
ActorEmail | summarize |
login_attempts | summarize |
AccountCustomEntity | extend |