Event ID 4625

Hi experts,
I'm getting a fair number of these events being logged, this one is trying the account "sales" but there are others as well that don't exist, someone/something is obviously trying different accounts hoping one works...My question is, is there anyway to tell where this is coming from? In the network section it doesn't actually have any infomation logged..other than a workstation name that does not existing anywhere on the local network..I can lock other services/ports on the firewall but there really isn't much open not other than some exchange services, iis, etc. any thoughts about a service or other suggestions on where to look to narrow this down?


Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          9/16/2015 7:50:22 PM
Event ID:      4625
Task Category: Logon
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      SERVERNAME.domainname.local
Description:
An account failed to log on.

Subject:
      Security ID:            NULL SID
      Account Name:            -
      Account Domain:            -
      Logon ID:            0x0

Logon Type:                  3

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

Failure Information:
      Failure Reason:            Unknown user name or bad password.
      Status:                  0xc000006d
      Sub Status:            0xc0000064

Process Information:
      Caller Process ID:      0x0
      Caller Process Name:      -

Network Information:
      Workstation Name:      WIN-F2REQONOU39
      Source Network Address:      -
      Source Port:            -

Detailed Authentication Information:
      Logon Process:            NtLmSsp
      Authentication Package:      NTLM
      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.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
    <EventID>4625</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8010000000000000</Keywords>
    <TimeCreated SystemTime="2015-09-17T00:50:22.308118700Z" />
    <EventRecordID>268461390</EventRecordID>
    <Correlation />
    <Execution ProcessID="988" ThreadID="320" />
    <Channel>Security</Channel>
    <Computer>SERVERNAME.DOMAINNAME.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="SubjectUserSid">S-1-0-0</Data>
    <Data Name="SubjectUserName">-</Data>
    <Data Name="SubjectDomainName">-</Data>
    <Data Name="SubjectLogonId">0x0</Data>
    <Data Name="TargetUserSid">S-1-0-0</Data>
    <Data Name="TargetUserName">sales</Data>
    <Data Name="TargetDomainName">
    </Data>
    <Data Name="Status">0xc000006d</Data>
    <Data Name="FailureReason">%%2313</Data>
    <Data Name="SubStatus">0xc0000064</Data>
    <Data Name="LogonType">3</Data>
    <Data Name="LogonProcessName">NtLmSsp </Data>
    <Data Name="AuthenticationPackageName">NTLM</Data>
    <Data Name="WorkstationName">WIN-F2REQONOU39</Data>
    <Data Name="TransmittedServices">-</Data>
    <Data Name="LmPackageName">-</Data>
    <Data Name="KeyLength">0</Data>
    <Data Name="ProcessId">0x0</Data>
    <Data Name="ProcessName">-</Data>
    <Data Name="IpAddress">-</Data>
    <Data Name="IpPort">-</Data>
  </EventData>
</Event>
LVL 2
ChiITAsked:
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McKnifeCommented:
Take a machine outside of the LAN and do a portscan of that machine that is attacked. Then list the open ports here and tell us what you think they are needed for, so we can discuss it.
ChiITAuthor Commented:
Hi McKnife, outside the LAN as from the Internet?
McKnifeCommented:
Right.
ChiITAuthor Commented:
Hi all, I've enabled intrusion protection on the firewall and these seem to have subsided.

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ChiITAuthor Commented:
I originally was looking for a way to block these and found there was a intrusion prevention setting that was not turned on, on the firewall. turning it on seems to have blocked these
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