Event ID: 4624

An account was successfully logged on

An account was successfully logged on.

    Security ID:           %1
    Account Name:          %2
    Account Domain:        %3
    Logon ID:              %4

Logon Information:
    Logon Type:            %9
    Restricted Admin Mode: %22 [Windows 10+]
    Virtual Account:       %25 [Windows 10+]
    Elevated Token:        %27 [Windows 10+]

Impersonation Level:       %21 [Windows 8/2012+]

New Logon:
    Security ID:            %5
    Account Name:           %6
    Account Domain:         %7
    Logon ID:               %8
    Linked Logon ID:        %26 [Windows 10+]
    Network Account Name:   %23 [Windows 10+]
    Network Account Domain: %24 [Windows 10+]
    Logon GUID:             %13

Process Information:
    Process ID:             %17
    Process Name:           %18

Network Information:
    Workstation Name:       %12
    Source Network Address: %19
    Source Port:            %20

Detailed Authentication Information:
    Logon Process:            %10
    Authentication Package:   %11
    Transited Services:       %14
    Package Name (NTLM only): %15
    Key Length:               %16

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 impersonation level field indicates the extent to which a process in the logon session can impersonate.

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.

This event generates when a logon session is created (on destination machine). It generates on the computer that was accessed, where the session was created.

Auditing:     Conditional

Audit on servers and workstations, on domain controllers if possible.

Volume:     Low Medium High Very High

Volume may be high on busy domain controllers.

Security recommendations

ISO 27001:2013 A.12.4.3
HIPAA: 164.308 (a)(5)(ii)(C)
NIST SP 800-53: AC-2
NIST 800-171: 3.1.1
CMMC v2 L1: AC.L2-3.1.16

Microsoft Documentation

Event ID - 4624

Name Field Insertion String OS Example
Security ID SubjectUserSid %1 Any S-1-5-18
Account Name SubjectUserName %2 Any ComputerName
Account Domain SubjectDomainName %3 Any WORKGROUP
Logon ID SubjectLogonId %4 Any 0x3e7
Security ID TargetUserSid %5 Any S-1-5-18
Account Name TargetUserName %6 Any SYSTEM
Account Domain TargetDomainName %7 Any DOMAIN
Logon ID TargetLogonId %8 Any 0x3e7
Logon Type LogonType %9 Any View Codes
Logon Process LogonProcessName %10 Any ProcessName
Authentication Package AuthenticationPackageName %11 Any View Codes
Workstation Name WorkstationName %12 Any ComputerName
Logon GUID LogonGuid %13 Any {00000000-0000-0000-0000-000000000000}
Transited Services TransmittedServices %14 Any -
Package Name (NTLM only) LmPackageName %15 Any NTLMv2
Key Length KeyLength %16 Any 0
Process ID ProcessId %17 Any 0x1f8
Process Name ProcessName %18 Any C:\Windows\System32\services.exe
Source Network Address IpAddress %19 Any
Source Port IpPort %20 Any 44555
Impersonation Level ImpersonationLevel %21 8/2012+ View Codes
Restricted Admin Mode RestrictedAdminMode %22 10+ Yes
Network Account Name TargetOutboundUserName %23 10+ -
Network Account Domain TargetOutboundDomainName %24 10+ -
Virtual Account VirtualAccount %25 10+ No
Linked Logon ID TargetLinkedLogonId %26 10+ 0x0
Elevated Token ElevatedToken %27 10+ %%1842

Lookup Audit Policy Configuration Settings

C:\> AuditPol.exe /get /subcategory:Logon

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