O que torna um logon 'especial'?
Logons especiais estão relacionados a sessões no nível do administrador, consulte a explicação do Technet aqui :
A special logon is used. A special logon is a logon that has administrator-equivalent privileges and can be used to elevate a process to a higher level.
Há também alguma discussão no site de respostas da Technet sobre ter muitos destes:
This is a useful right to detecting any "super user" account logons. Of course this right is logged for any server or applications accounts logging on as a batch job (scheduled task) or system service.
(por resposta de Miles Zhang)
Então, e outros eventos de logon?
Você pode ver uma explicação completa sobre esses eventos na Technet novamente :
...Additionally, interactive logons to a member server or workstation that use a domain account generate a logon event on the domain controller as the logon scripts and policies are retrieved when a user logs on.
Basicamente, quando você faz login, você gera eventos de logon. Existem diferentes tipos:
2 Interactive A user logged on to this computer.
3 Network A user or computer logged on to this computer from the network.
4 Batch Batch logon type is used by batch servers, where processes may be executing on behalf of a user without their direct intervention.
5 Service A service was started by the Service Control Manager.
7 Unlock This workstation was unlocked.
8 NetworkCleartext A user logged on to this computer from the network. The user's password was passed to the authentication package in its unhashed form. The built-in authentication packages all hash credentials before sending them across the network. The credentials do not traverse the network in plaintext (also called cleartext).
9 NewCredentials A caller cloned its current token and specified new credentials for outbound connections. The new logon session has the same local identity, but uses different credentials for other network connections.
10 RemoteInteractive A user logged on to this computer remotely using Terminal Services or Remote Desktop.
11 CachedInteractive A user logged on to this computer with network credentials that were stored locally on the computer. The domain controller was not contacted to verify the credentials.
A maioria será 2 (interativa) ou 3 (rede) ou 7 (desbloqueio).