Focus on Microsoft
Re: S-1-5-21... Jul 21 2008 06:34PM
Sean W (seancwelch gmail com)
Those numbers are from deleted user accounts or user accounts that can't
be verified with an authenticating domain controller. In other words,
the SID cannot be matched to a user name on your PC.

> Red Cat wrote:
>> Hey,
>> I have a question on something I saw on my computer today. I'm on a
>> Windows Vista. I was looking at some of the "properties" of some
>> folders in my "Public" folder and clicked on the "Security" tab. Then
>> I noticed my usual login user, "Everyone", and one other user, whose
>> id seemed to be S-1-5-21...and some numbers. Then after a couple
>> moments it turned into the user, "None" with (My computer name\None)
>> right next to it. I looked at the permissions it was given and
>> apparently it was given "Special Permissions." I was pretty sure I
>> didn't and never had created a user named "None". But I still checked
>> the Users folder to see if there was indeed a user named "None". There
>> wasn't. I even checked to see if there were any hidden users using the
>> "view hidden folder option", but there was no uesr by the name of
>> "None". I looked on google for some time but all I managed to find was
>> that it could possibly be a remnant from a past OS or something. But
>> this computer had Vista installed on it when I got it. Also, it might
>> be some sort of guest that was made for my computer or something. My
>> own speculation is that it has something to do with the fact that I
>> used Cygwin to open up a tarball and create this folder. Anyway, what
>> does this user mean? Why does it have special permissions? Is it some
>> sort of sign that I have a back door somewhere on my computer or that
>> I'm being keylogged or something? Thanks in advance.

[ reply ]


Privacy Statement
Copyright 2010, SecurityFocus