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Event ID: 4740 Source: Microsoft-Windows-Security-Auditing

Level
Description
An account was successfully logged on.

Subject:
    Security ID:        SYSTEM
    Account Name:        MYWINDOWS$
    Account Domain:        WORKGROUP
    Logon ID:        0x3e7

Logon Type:            5

New Logon:
    Security ID:        SYSTEM
    Account Name:        SYSTEM
    Account Domain:        NT AUTHORITY
    Logon ID:        0x3e7
    Logon GUID:        {00000000-0000-0000-0000-000000000000}

Process Information:
    Process ID:        0x204
    Process Name:        C:\Windows\System32\services.exe

Network Information:
    Workstation Name:    
    Source Network Address:    -
    Source Port:        -

Detailed Authentication Information:
    Logon Process:        Advapi  
    Authentication Package:    Negotiate
    Transited Services:    -
    Package Name (NTLM only):    -
    Key Length:        0

This event is generated when a logon session is created. It is generated on the computer that was accessed.

The subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.

The logon type field indicates the kind of logon that occurred. The most common types are 2 (interactive) and 3 (network).

The New Logon fields indicate the account for whom the new logon was created, i.e. the account that was logged on.

The network fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.

The authentication information fields provide detailed information about this specific logon request.
    - Logon GUID is a unique identifier that can be used to correlate this event with a KDC event.
    - Transited services indicate which intermediate services have participated in this logon request.
    - Package name indicates which sub-protocol was used among the NTLM protocols.
    - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Comments
 
This event simply indicates that a logon session has been created. The administrator should analyze the user name, workstation name, the logon type and the process name listed and determine if the logon session is legit.

EV100253 lists the logon types typically recorded in this kind of events. EV100254  contains a description of Windows Authentication Packages.

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