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Event Logs - I don't like what I'm seeing

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#1 cooljay


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Posted 08 July 2018 - 06:35 PM

I never knew about event logs until very recently and now I can't stop looking.


Still dealing with connectivity issues, so it makes sense to play detective, but there is one particular thing which freaks me out.


A while ago, I noticed in Firefox properties that there is an entity there that is very mysterious.


Now it turns out that this S 1-5-8 etc. is a Microsoft Security Check that is CONSTANTLY logging in and out, and I don't like it one bit.

First of all, it doesn't have authorization to access my computer, I checked on that. It only accesses through Firefox. (No, I haven't contacted Mozilla about it, but I will.) When I discovered it a couple of months ago it had authority to read, write, etc. which I immediately relieved it of. But it still has "special" powers, whatever that means.


But that's not all. There are also event logs from System, id# 1530, like this:


Log Name:      Application
Source:        Microsoft-Windows-User Profiles Service
Date:          7/8/2018 5:28:49 PM
Event ID:      1530
Task Category: None
Level:         Warning
User:          SYSTEM
Computer:      HP-Laptop
Windows detected your registry file is still in use by other applications

or services. The file will be unloaded now. The applications or services

that hold your registry file may not function properly afterwards.  

 1 user registry handles leaked from \Registry\User\S-1-5-21-


Process 944 (\Device

\HarddiskVolume2\Windows\System32\svchost.exe) has opened key


Event Xml:

    <Provider Name="Microsoft-Windows-User Profiles Service"

Guid="{89B1E9F0-5AFF-44A6-9B44-0A07A7CE5845}" />
    <TimeCreated SystemTime="2018-07-08T21:28:49.133184500Z" />
    <Correlation />
    <Execution ProcessID="944" ThreadID="7764" />
    <Security UserID="S-1-5-18" />
  <EventData Name="EVENT_HIVE_LEAK">
    <Data Name="Detail">1 user registry handles leaked from \Registry

Process 944

(\Device\HarddiskVolume2\Windows\System32\svchost.exe) has

opened key \REGISTRY\USER\S-1-5-21-1382324992-2956011349-



Am I overreacting only is this as freaky as it looks?


In the advanced firewall settings I don't have Remote Access allowed at all. So I don't know how this is even possible, but there you have it. It happens, and I wish I knew what it means and how to stop it, if necessary.


Any ideas? I would appreciate your input on this.




(I would upload an image of "S" from Firefox Properties, but I don't see where I could do that.)




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#2 Didier Stevens

Didier Stevens

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Posted 09 July 2018 - 11:28 AM

Security ID S-1-5-18 is the local system:



All Windows machines use this SID, it's normal that you see plenty of Windows events logs with this SID.

Didier Stevens

SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019


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#3 cooljay

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Posted 17 July 2018 - 10:34 PM

Thanks, Didier.


As to the larger issue of dozens and dozens of "Security Audits" per day - I'm fed up with this nonsense. This is just an old laptop I use around the house. We are not talking about a network of a billion dollar corporation. It's ridiculous, really, and I want it to stop.


I tried, logged in as admin, to revoke these permissions, but they somehow return unscathed. Any ideas, anybody, what I can do to stop this? Do other people have this going on, do you think this is normal? Does it bother you? I'm talking about an entity, supposedly Microsoft, taking on the identity of the users of this laptop, to gain access and do what it wants to do, and afterwards destroying the login session. (Yes, that's logged too.)


This totally rubs me the wrong way.

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