Thousands of failed login 4625 events, corresponding with 1003 events form Security-SSP

Question

I've got a server running Server 2012 R2, it's got a few services and such, but lately there have been thousand of failed logins, they seem to happen every 30 minutes and there is about 10 or so at a time. I checked the application logs and there seem to
be corresponding events from Security-SSP at the same times, event ID 1003,a s well as a few different ones at random times. These are the details for the 4625 events:
An account failed to log on.
Subject:
    Security ID:        SYSTEM
    Account Name:        SERVER$
    Account Domain:        MYSERVER
    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:    0x2c4
    Caller Process Name:    C:\Windows\System32\lsass.exe
Network Information:
    Workstation Name:    SERVER
    Source Network Address:    -
    Source Port:        -
Detailed Authentication Information:
    Logon Process:        Schannel
    Authentication Package:    Kerberos
    Transited Services:    -
    Package Name (NTLM only):    -
    Key Length:        0
System
Provider
[ Name]
Microsoft-Windows-Security-Auditing
[ Guid]
{54849625-5478-4994-A5BA-3E3B0328C30D}
EventID
4625
Version
0
Level
0
Task
12544
Opcode
0
Keywords
0x8010000000000000
TimeCreated
[ SystemTime]
2014-10-08T15:39:27.023566500Z
EventRecordID
555922
Correlation
Execution
[ ProcessID]
708
[ ThreadID]
11356
Channel
Security
Computer
Server.MYSERVER.local
Security
EventData
SubjectUserSid
S-1-5-18
SubjectUserName
SERVER$
SubjectDomainName
MYSERVER
SubjectLogonId
0x3e7
TargetUserSid
S-1-0-0
TargetUserName
TargetDomainName
Status
0xc000006d
FailureReason
%%2313
SubStatus
0xc0000064
LogonType
3
LogonProcessName
Schannel
AuthenticationPackageName
Kerberos
WorkstationName
SERVER
TransmittedServices
LmPackageName
KeyLength
0
ProcessId
0x2c4
ProcessName
C:\Windows\System32\lsass.exe
IpAddress
IpPort
And the 1003 events:
System
Provider
[ Name]
Microsoft-Windows-Security-SPP
[ Guid]
{E23B33B0-C8C9-472C-A5F9-F2BDFEA0F156}
[ EventSourceName]
Software Protection Platform Service
EventID
1003
[ Qualifiers]
16384
Version
0
Level
4
Task
0
Opcode
0
Keywords
0x80000000000000
TimeCreated
[ SystemTime]
2014-10-08T11:09:21.000000000Z
EventRecordID
7230
Correlation
Execution
[ ProcessID]
0
[ ThreadID]
0
Channel
Application
Computer
Server.MYSERVER.local
Security
EventData
55c92734-d682-4d71-983e-d6ec3f16059f
1: e96022a1-3247-4125-9ddc-4c6068ab3bfc, 1, 1 [(0 [0x00000000, 1, 0], [(?)( 1 0x00000000)(?)( 2 0x00000000 0 0 msft:rm/algorithm/hwid/4.0 0x00000000 0)(?)(?)( 10 0x00000000 msft:rm/algorithm/flags/1.0)(?)])(1 )(2 )]
There are also a few 900, 902, 903 events. Any ideas what is happening? Everything seems to be running fine.

Answer 1

Hi,
The event 4625 indicates a computer account failed to logon. You could run NLTEST /SC_RESET:domain-name command with administrative credentials to check domain’s health.
For more detailed information, please see:
Audit Failure event ID 4625
https://social.technet.microsoft.com/Forums/windowsserver/en-US/ae9da10a-b4d2-4eda-ae6d-ad61b7b6ab79/audit-failure-event-id-4625?forum=winserversecurity
You could also refer to the similar threads to troubleshoot the issue:
numerous 4625 errors in the event log
https://social.technet.microsoft.com/Forums/windowsserver/en-US/c6b0d058-98d0-4572-8a72-e18e353b04fd/numerous-4625-errors-in-the-event-log?forum=winserversecurity
Many Audit Failure Event ID 4625
https://social.technet.microsoft.com/Forums/windowsserver/en-US/8f7ebcf5-2310-42c3-9b6a-20205a6c17ef/many-audit-failure-event-id-4625?forum=winserveressentials
Best Regards,
Mandy 
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