title: Account Tampering - Suspicious Failed Logon Reasons
description: This method uses uncommon error codes on failed logons to determine suspicious activity and tampering with accounts that have been disabled or somehow restricted.
author: Florian Roth
modified: 2019/03/01
references:
    - https://twitter.com/SBousseaden/status/1101431884540710913
tags:
    - attack.persistence
    - attack.privilege_escalation
    - attack.t1078
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 4625
            - 4776
        Status:
            - '0xC0000072'  # User logon to account disabled by administrator
            - '0xC000006F'  # User logon outside authorized hours
            - '0xC0000070'  # User logon from unauthorized workstation
            - '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
            - '0xC000018C'  # The logon request failed because the trust relationship between the primary domain and the trusted domain failed
            - '0xC000015B'  # The user has not been granted the requested logon type (aka logon right) at this machine
    condition: selection
falsepositives:
    - User using a disabled account
level: high