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50,000  failed log ins in event viewer on server a day event ID 4625

Posted on 2015-02-10
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Last Modified: 2015-02-24
I am currently getting over 50,000 failed logins a day from the user created on server that in the cert publishers group.  This is the error showing in event viewer.  Any help will be appreciated.

An account failed to log on.

Subject:
      Security ID:            SYSTEM
      Account Name:            DCJT28Y1$
      Account Domain:            rochdale
      Logon ID:            0x3E7

Logon Type:                  3

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

Failure Information:
      Failure Reason:            Unknown user name or bad password.
      Status:                  0xC000006D
      Sub Status:            0xC0000064

Process Information:
      Caller Process ID:      0x294
      Caller Process Name:      C:\Windows\System32\lsass.exe

Network Information:
      Workstation Name:      DCJT28Y1
      Source Network Address:      -
      Source Port:            -

Detailed Authentication Information:
      Logon Process:            Schannel
      Authentication Package:      Kerberos
      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.
      - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
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Question by:peraspera
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5 Comments
 
LVL 5

Expert Comment

by:R. Toby Richards
ID: 40601135
It looks to me like there is some malware on your network.
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LVL 2

Expert Comment

by:Axis52401
ID: 40601276
I agree with Toby. Seems to be a brute force attack. Does it come from the same computer each time? Either way you need to run some virus scans asap. Your current a/v hasn't caught it so i'd suggest using the free security scanner from microsoft, http://www.microsoft.com/security/scanner/en-us/default.aspx, it actually works very well.
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LVL 5

Expert Comment

by:R. Toby Richards
ID: 40601280
Or Malwarebytes.
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Accepted Solution

by:
peraspera earned 0 total points
ID: 40608479
Thank you for the suggestions I have ran both the security scanner and Malwarebytes and have found no bots.  The failed logins are still occurring.
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Author Closing Comment

by:peraspera
ID: 40627758
best solution
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