Brute force attack against user credentials (Uses Authentication Normalization)

id: a6c435a2-b1a0-466d-b730-9f8af69262e8
name: Brute force attack against user credentials (Uses Authentication Normalization)
description: |
  'Identifies evidence of brute force activity against a user based on multiple authentication failures and at least one successful authentication within a given time window.
  Note that the query does not enforce any sequence, and does not require the successful authentication to occur last.
  The default failure threshold is 10, success threshold is 1, and the default time window is 20 minutes.
  To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimAuthentication)'
severity: Medium
requiredDataConnectors: []
queryFrequency: 20m
queryPeriod: 20m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CredentialAccess
relevantTechniques:
  - T1110
tags:
  - Id: 28b42356-45af-40a6-a0b4-a554cdfd5d8a
    version: 1.0.0
  - Schema: ASIMAuthentication
    SchemaVersion: 0.1.0
query: |
  let failureCountThreshold = 10;
  let successCountThreshold = 1;
  // let authenticationWindow = 20m; // Implicit in the analytic rule query period 
  imAuthentication
  | where TargetUserType != "NonInteractive"
  | summarize 
        StartTime = min(TimeGenerated), 
        EndTime = max(TimeGenerated), 
        IpAddresses = make_set (SrcDvcIpAddr, 100),
        ReportedBy = make_set (strcat (EventVendor, "/", EventProduct), 100),
        FailureCount = countif(EventResult=='Failure'),
        SuccessCount = countif(EventResult=='Success')
    by 
        TargetUserId, TargetUsername, TargetUserType 
  | where FailureCount >= failureCountThreshold and SuccessCount >= successCountThreshold
  | extend
        IpAddresses = strcat_array(IpAddresses, ", "), 
        ReportedBy = strcat_array(ReportedBy, ", ")
  | extend
    Name = iif(
        TargetUsername contains "@"
            , tostring(split(TargetUsername, '@', 0)[0])
            , TargetUsername
        ),
    UPNSuffix = iif(
        TargetUsername contains "@"
        , tostring(split(TargetUsername, '@', 1)[0])
        , ""
    )

entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: TargetUserName
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix

customDetails:
  IpAddresses: IpAddresses
  ReportedBy: ReportedBy
version: 1.2.5
kind: Scheduled
metadata:
    source:
        kind: Community
    author:
        name: Ofer Shezaf
    support:
        tier: Community
    categories:
        domains: [ "Security - Others", "Identity" ]