Detection rules › Kusto

GWorkspace - Possible brute force attack

Status
available
Severity
medium
Time window
5m
Group by
ActorEmail
Source
github.com/Azure/Azure-Sentinel

Detects possible brute force attack.

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

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.

Output fields

These fields are emitted when the rule matches.

FieldSource
ActorEmailsummarize
login_attemptssummarize
AccountCustomEntityextend