Windows 10: Event Viewer shows thousands of failed logon attempts

Hello,a couple of days ago i logged on a PC in our network and realised someone was on that machine windows 10. I realized it immediately because i saw this on my screen:The first one is already in English and the second one says:CScript error: Loading of the script failed The operation could not be successfully completed because the file contains a virus or potentially unwanted software. The batch file could not be found.I immediately went to the respective computer and disconnected it from the network. This PC does not contain any important passwords, accounts or data, so I had no concer

:)

 

Events duplication (in event viewer) after successful logon (in event viewer).

Can you please explain me why I see several (looks like duplicated) event in Event Viewer after successful logon.

For example after reboot (Win 10 workstation, no domain, no any specific configuration) I see in security log 2 totally identical logs for event 4624, type 2

The same situation for "Unlock"

I want to show you these events in logs:

In this example PC in domain, and I am reproducing windows UNLOCK (logoff - logon):

FIRST EVENT

Log Name: Security

Source: Microsoft-Windows-Security-Auditing

Date: 2/14/2017 1:35:30 PM

Event ID: 4624

Task Category: Logon

Level: Information

Keywords: Audit Success

User: N/A

Computer: mpxxx.xxx.xxx.net

Description:

An account was successfully logged on.

Subject:

Security ID: SYSTEM

Account Name: MPxxx$

Account Domain: KIV

Logon ID: 0x3E7

Logon Information:

Logon Type: 7

Restricted Admin Mode: -

Virtual Account: No

Elevated Token: Yes

Impersonation Level: Impersonation

New Logon:

Security ID: UNIVERSE\mpxxx

Account Name: mpxxx

Account Domain: UNIVERSE

Logon ID: 0x3D5986

Linked Logon ID: 0x3D8CF3

Network Account Name: -

Network Account Domain: -

Logon GUID: {a97eb034-e1a9-beba-9e13-0376df13c092}

Process Information:

Process ID: 0x2cc

Process Name: C:\Windows\System32\lsass.exe

Network Information:

Workstation Name: MPxxx

Source Network Address: -

Source Port: -

Detailed Authentication Information:

Logon Process: Negotiat

Authentication Package: Negotiate

Transited Services: -

Package Name (NTLM only): -

Key Length: 0

SECOND DUPLICATED EVENT:

Log Name: Security

Source: Microsoft-Windows-Security-Auditing

Date: 2/14/2017 1:35:30 PM

Event ID: 4624

Task Category: Logon

Level: Information

Keywords: Audit Success

User: N/A

Computer: mpxxx.xxx.xxx.net

Description:

An account was successfully logged on.

Subject:

Security ID: SYSTEM

Account Name: MPxxx$

Account Domain: KIV

Logon ID: 0x3E7

Logon Information:

Logon Type: 7

Restricted Admin Mode: -

Virtual Account: No

Elevated Token: No

Impersonation Level: Impersonation

New Logon:

Security ID: UNIVERSE\mpxxx

Account Name: mpxxx

Account Domain: UNIVERSE

Logon ID: 0x3D8CF3

Linked Logon ID: 0x3D5986

Network Account Name: -

Network Account Domain: -

Logon GUID: {00000000-0000-0000-0000-000000000000}

Process Information:

Process ID: 0x2cc

Process Name: C:\Windows\System32\lsass.exe

Network Information:

Workstation Name: MPxxx

Source Network Address: -

Source Port: -

Detailed Authentication Information:

Logon Process: Negotiat

Authentication Package: Negotiate

Transited Services: -

Package Name (NTLM only): -

Key Length: 0

The only difference is in "Elevated Token: and Logon GUID:" portion of output

Dear MS Guru please give me any ideas why this duplication happens. It is important for because I am planning to send events to third party security system and duplication makes a lot of unnecessary noise

Thank you.

 

thousands of security logs in event viewer

Yea, I've always found those logs pretty strange. I've seen them numerous times in my Event Viewer as well.
I currently have: 26,124
of these logs.

What is strange is that in General tab below for each of them, they show:
• Special privileges assigned to new logon.
• An account was successfully logged on.
• Credential Manager credentials were read.

 

thousands of security logs in event viewer

it's weird, the CMD command doesn't show the security log number, it only shows the word "Security" but it's blank. The power shell however does show. And since I wrote the post, I got 1000+ more, and Event Viewer even added Exclamation mark next to the number. It shows: 13110(!) New events available

EventID are mostly 5379 and 4798.

Powershell output:
Code:

- - - Updated - - -

Oh so I guess it's something normal?