Multiple security audit failures a second

Question

A client's SBS 2011 machine is experiencing multiple audit failures a second and we believe it is diminishing the performance of the machine. We can't seem to find the source or how to remedy the issue. It its happening way too fast to be a human trying
to login. 
Keywords Date and Time Source Event ID Task Category
Audit Success 6/18/2014 1:50:32 PM Microsoft-Windows-Security-Auditing 4905 Audit Policy Change "An attempt was made to unregister a security event source.
Subject
Security ID: SYSTEM
Account Name: SBS$
Account Domain: <ommited from forum post>
Logon ID: 0x3e7
Process:
Process ID: 0x10d4
Process Name: C:\Program Files\Windows Server\Bin\SharedServiceHost.exe
Event Source:
Source Name: ServiceModel 4.0.0.0
Event Source ID: 0x262070f0"
Audit Success 6/18/2014 1:50:32 PM Microsoft-Windows-Security-Auditing 4904 Audit Policy Change "An attempt was made to register a security event source.
Subject :
Security ID: SYSTEM
Account Name: SBS$
Account Domain: < ommited from forum post >
Logon ID: 0x3e7
Process:
Process ID: 0x10d4
Process Name: C:\Program Files\Windows Server\Bin\SharedServiceHost.exe
Event Source:
Source Name: ServiceModel 4.0.0.0
Event Source ID: 0x262070f0"
Audit Failure 6/18/2014 1:50:32 PM Microsoft-Windows-Security-Auditing 4625 Logon "An account failed to log on.
Subject:
Security ID: SYSTEM
Account Name: SBS$
Account Domain: <ommited from forum post>
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: 0x24c
Caller Process Name: C:\Windows\System32\lsass.exe
Network Information:
Workstation Name: SBS
Source Network Address: -
Source Port: -
Detailed Authentication Information:
Logon Process: Schannel
Authentication Package: Kerberos
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
Subject
Security ID:
SYSTEM
Account Name:
SBS$
Account Domain:
<ommited from forum post>
Logon ID:
0x3e7
Process:
Process ID:
0x131c
Process Name:
C:\Program Files\Windows Server\Bin\SharedServiceHost.exe
Event Source:
Source Name:
ServiceModel 4.0.0.0
Event Source ID:
0x26206ef4"
Audit Success 6/18/2014 1:50:32 PM
Microsoft-Windows-Security-Auditing
4904 Audit Policy Change
"An attempt was made to register a security event source.
Subject :
Security ID:
SYSTEM
Account Name:
SBS$
Account Domain:
<ommited from forum post>
Logon ID:
0x3e7
Process:
Process ID:
0x131c
Process Name:
C:\Program Files\Windows Server\Bin\SharedServiceHost.exe
Event Source:
Source Name:
ServiceModel 4.0.0.0
Event Source ID:
0x26206ef4"
Audit Failure 6/18/2014 1:50:32 PM
Microsoft-Windows-Security-Auditing
4625 Logon
"An account failed to log on.
Subject:
Security ID:
SYSTEM
Account Name:
SBS$
Account Domain:
<ommited from forum post>
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:
0x24c
Caller Process Name:
C:\Windows\System32\lsass.exe
Network Information:
Workstation Name:
SBS
Source Network Address:
Source Port:
Detailed Authentication Information:
Logon Process:
Schannel
Authentication Package:
Kerberos
Transited Services:
Package Name (NTLM only):
Key Length:
0
Jerry T

Answer 1

Hi Jerry,
Windows logs logon type 3 in most cases when you access a computer from elsewhere on the network. This is usually
related to share folders, printers, IIS and so on.
Would you please let me confirm whether you had installed some third-party applications?
Meanwhile, please refer to Robert’s suggestion in the following similar thread and check if can help you.
Audit
Failure - Event 4625
If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu