I know for certain that I was away from my Windows 7 Home Premium laptop between 12:35 and 14:37. But the eventvwr.exe shows the following:

  • 28/10/2015 14:54:25 Event ID 4624 (access type: 2)
  • 28/10/2015 14:36:44 Event ID 4624 (access type: 7)
  • 28/10/2015 13:08:52 Event ID 4624 (access type: 5)
  • 28/10/2015 12:19:01 Event ID 4624 (access type: 5)
  • 28/10/2015 12:17:59 Event ID 4624 (access type: 2)

It seems like someone (who has the key to my living place) logged in at 13:08:52 when I was away.

How is this possible?

I am absolutely certain that nobody knows my password. It is unique and I don't use it anywhere else.

Is there a way Event ID 4624 could correspond to something other than a physical person logging in, or is there some way someone could enter by brute force that I am not aware of? Thanks.

EDIT: Here are the details pertaining to the access at 13:08:52 (once again, sorry if the log is in Italian, I am running a localized version of Windows):

Accesso di un account riuscito.

    ID sicurezza:       SYSTEM
    Nome account:       NEIL-PC$
    Dominio account:        WORKGROUP
    ID accesso:     0x3e7

Tipo di accesso:            5

Nuovo accesso:
    ID sicurezza:       SYSTEM
    Nome account:       SYSTEM
    Dominio account:        NT AUTHORITY
    ID accesso:     0x3e7
    GUID accesso:       {00000000-0000-0000-0000-000000000000}

Informazioni sul processo:
    ID processo:        0x2a0
    Nome processo:      C:\Windows\System32\services.exe

Informazioni di rete:
    Nome workstation:   
    Indirizzo rete di origine:  -
    Porta di origine:       -

Informazioni di autenticazione dettagliate:
    Processo di accesso:        Advapi  
    Pacchetto di autenticazione:    Negotiate
    Servizi transitati: -
    Nome pacchetto (solo NTLM): -
    Lunghezza chiave:       0

Questo evento viene generato quando viene creata una sessione di accesso. Viene generato nel computer in cui è stato effettuato l'accesso.

Il campo Soggetto indica l'account nel sistema locale che ha richiesto l'accesso. Generalmente si tratta di un servizio, quale il servizio Server, o di un processo locale, ad esempio Winlogon.exe o Services.exe.

Il campo Tipo di accesso indica il tipo di accesso che è stato effettuato. I tipi più comuni sono 2 (interattivo) e 3 (rete).

Il campo Nuovo accesso indica l'account per il quale è stato creato il nuovo accesso, vale a dire l'account che ha effettuato l'accesso.

Il campo Informazioni di rete indica l'origine della richiesta di accesso remota. Il nome della workstation non è sempre disponibile e può essere vuoto in alcuni casi.

Il campo Informazioni di autenticazione fornisce informazioni dettagliate sulla specifica richiesta di accesso.
    - GUID accesso è un identificatore univoco che può essere utilizzato per correlare questo evento a un evento KDC.
    - Servizi transitati indica quali servizi intermedi hanno partecipato alla richiesta di accesso.
    - Nome pacchetto indica quale sottoprotocollo dei protocolli NTLM è stato utilizzato.
    - Lunghezza chiave indica la lunghezza della chiave di sessione generata. Se non è stata richiesta alcuna chiave di sessione, la lunghezza sarà pari a zero.
  • 3
    Why not look at the detail of the event and see what account was logging in? Could have been a system account. – Paul Oct 28 '15 at 21:02
  • I've updated my post. Could you make out the kind of access? – Jordan Jamingsons Oct 28 '15 at 21:10
  • @Paul, could you please help me... the access type is set to 5, and the message says the most common access types are 2 for interactive, and 3 for a network access. Any ideas what 5 stands for? – Jordan Jamingsons Oct 28 '15 at 21:12
  • 1
    Logon Type 5 - Service, from windowsecurity.com/articles-tutorials/misc_network_security/…. So just system services doing their thing. – jjlin Oct 28 '15 at 21:31

SYSTEM Nome account: SYSTEM

I dont speak italian but this looks like a system action...

  • Thanks. The problem I am having is that my version of windows doesn't log unlock and lock events, which leaves a shade of doubt. Could you please help me find some other things to look for as evidence on this version of Windows 7 of an intrusion? It's very important to me. – Jordan Jamingsons Oct 28 '15 at 21:19
  • 1
    @JordanJamingsons Your copy of Windows DOES log Unlocks, that's what Logon/Access Type 7 is (i.e.: 28/10/2015 14:36:44 Event ID 4624 (access type: 7)). – Ƭᴇcʜιᴇ007 Oct 28 '15 at 21:34
  • Thanks, now that's a great comment. Now what I need is to find a screen lock event. If the screen did not lock within the amount of time set in the control panel I will know someone accessed my computer. I would really really really appreciate help with this... – Jordan Jamingsons Oct 28 '15 at 21:45
  • @Ƭᴇcʜιᴇ007, I don't get it. You say that access type 7 is a screen unlock, whereas the answer to this post says event locks and unlocks cannot be logged in Home Premium. What is the truth? – Jordan Jamingsons Oct 28 '15 at 21:49
  • There's a difference between logging the Locks and Unlocks, and Logging in successfully after unlocking. The latter is what you have, the former is what you need Pro for. – Ƭᴇcʜιᴇ007 Oct 28 '15 at 21:52

Nome processo: C:\Windows\System32\services.exe

This says the process name that requested the logon was Services.exe, which is the file used by Windows to control system services.

Nome account: SYSTEM

The name of the account that ran Services.exe is SYSTEM, which is the system account (Windows itself).

Tipo di accesso: 5

Type of Access/Logon Type: 5 means "Service".

Here's a complete list of logon types

So it was Windows starting a service, and that service is set to login as the System account.

This is all perfectly normal.

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