gte_6_FailedLogons_10m.yaml

id: 0777f138-e5d8-4eab-bec1-e11ddfbc2be2
name: Failed logon attempts by valid accounts within 10 mins
description: |
  'Identifies when failed logon attempts are 20 or higher during a 10 minute period (2 failed logons per minute minimum) from valid account.'
severity: Low
requiredDataConnectors:
  - connectorId: SecurityEvents
    dataTypes:
      - SecurityEvent
  - connectorId: WindowsSecurityEvents
    dataTypes:
      - SecurityEvent
queryFrequency: 10m
queryPeriod: 10m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CredentialAccess
relevantTechniques:
  - T1110
query: |
  let threshold = 20;
  SecurityEvent 
  | where EventID == 4625
  | where AccountType =~ "User"
  | where SubStatus !='0xc0000064' and Account !in ('\\', '-\\-')
  // SubStatus '0xc0000064' signifies 'Account name does not exist'
  | extend ResourceId = column_ifexists("_ResourceId", _ResourceId), SourceComputerId = column_ifexists("SourceComputerId", SourceComputerId)
  | extend Reason = case(
  SubStatus =~ '0xC000005E', 'There are currently no logon servers available to service the logon request.',
  SubStatus =~ '0xC0000064', 'User logon with misspelled or bad user account',
  SubStatus =~ '0xC000006A', 'User logon with misspelled or bad password', 
  SubStatus =~ '0xC000006D', 'Bad user name or password',
  SubStatus =~ '0xC000006E', 'Unknown user name or bad password',
  SubStatus =~ '0xC000006F', 'User logon outside authorized hours',
  SubStatus =~ '0xC0000070', 'User logon from unauthorized workstation',
  SubStatus =~ '0xC0000071', 'User logon with expired password',
  SubStatus =~ '0xC0000072', 'User logon to account disabled by administrator',
  SubStatus =~ '0xC00000DC', 'Indicates the Sam Server was in the wrong state to perform the desired operation', 
  SubStatus =~ '0xC0000133', 'Clocks between DC and other computer too far out of sync',
  SubStatus =~ '0xC000015B', 'The user has not been granted the requested logon type (aka logon right) at this machine',
  SubStatus =~ '0xC000018C', 'The logon request failed because the trust relationship between the primary domain and the trusted domain failed',
  SubStatus =~ '0xC0000192', 'An attempt was made to logon, but the Netlogon service was not started',
  SubStatus =~ '0xC0000193', 'User logon with expired account',
  SubStatus =~ '0xC0000224', 'User is required to change password at next logon',
  SubStatus =~ '0xC0000225', 'Evidently a bug in Windows and not a risk',
  SubStatus =~ '0xC0000234', 'User logon with account locked',
  SubStatus =~ '0xC00002EE', 'Failure Reason: An Error occurred during Logon',
  SubStatus =~ '0xC0000413', 'Logon Failure: The machine you are logging onto is protected by an authentication firewall. The specified account is not allowed to authenticate to the machine',
  strcat('Unknown reason substatus: ', SubStatus))
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), FailedLogonCount = count() by EventID, 
  Activity, Computer, Account, TargetAccount, TargetUserName, TargetDomainName, 
  LogonType, LogonTypeName, LogonProcessName, Status, SubStatus, Reason, ResourceId, SourceComputerId, WorkstationName, IpAddress
  | where FailedLogonCount >= threshold
  | extend timestamp = StartTime, AccountCustomEntity = Account, HostCustomEntity = Computer, IPCustomEntity = IpAddress
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountCustomEntity
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: HostCustomEntity
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.0