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Hundreds of logon attempts - c attack?

mauriciocastro
mauriciocastro used Ask the Experts™
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An account failed to log on.

Subject:
      Security ID:            SYSTEM
      Account Name:            CL-T137-302CN$
      Account Domain:            WORKGROUP
      Logon ID:            0x3e7

Logon Type:                  8

Account For Which Logon Failed:
      Security ID:            NULL SID
      Account Name:            Administrator
      Account Domain:            \

Failure Information:
      Failure Reason:            Unknown user name or bad password.
      Status:                  0xc000006d
      Sub Status:            0xc000006a

Process Information:
      Caller Process ID:      0x528
      Caller Process Name:      C:\Windows\System32\svchost.exe

Network Information:
      Workstation Name:      CL-T137-302CN
      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 request fails. It is generated on the computer where access was attempted.

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 was requested. The most common types are 2 (interactive) and 3 (network).

The Process Information fields indicate which account and process on the system requested the logon.

The Network Information 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.
      - Transited services indicate which intermediate services have participated in this logon request.
      - Package name indicates which sub-protocol was used among the NTLM protocols.


I do not know what to do to block. This bandwidth consuming me and I can not stop the attack
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What's running with PID 0x528 (PID 1320) on that system?
Server Administrator
Commented:
We have seen similar situations where someone configured a service and either mistyped the password, or the password has changed since it was configured. You should if there are any services running on that system with that username as the service account.