I was searching for some info on sdhl.dat and found this:
Was searching for infos on (sdhl.dat) and found this


I have a .dat file on my PC and every time I try to delete it, it comes back after restarting the PC. After some search I found this "anonymous registration". Should I be worried about it? Can this be a virus? I have already checked it on VirusTotal and Malwarebytes and it was safe but I still have my concerns over this .dat file. The only thing I found was that the game Valorant creates some .dat files on some users.

1 Answer 1


NT AUTHORITY\ANONYMOUS LOGON is a special pseudo user account in Windows. It is defined by Microsoft as a "special identity":

Anonymous Logon

Any user who accesses the system through an anonymous logon has the Anonymous Logon identity. This identity allows anonymous access to resources, such as a web page that is published on corporate servers. The Anonymous Logon group is not a member of the Everyone group by default.

This allows access to the file by any network or web user that has the permission to use the computer or web-app without specifying a password. It's most commonly found in web-apps, if you're using your computer as web-server via IIS.

In short, this is a harmless file permission, that commonly would never have any effect (unless the file is part of a web-app or is shared over a network in which anonymous access is allowed).

  • Thank u alot for helping !!! just another question if u have time. i got this sdhl.dat file and i dont know what it is or from where it comes is there a way to check it ?
    – Daniel
    Aug 8, 2022 at 11:06
  • There is no reference to such a file on the internet and it doesn't exist on my computer. Perhaps the folder in which it's found would give an indication of the process that created it.
    – harrymc
    Aug 8, 2022 at 11:09
  • the thing is it doesnt go to a folder it gets "created" on the desktop
    – Daniel
    Aug 8, 2022 at 11:19
  • 1
    You could delete the file and use Process Monitor to find out which process is creating it. If this is happening during boot, you need boot logging - see this answer.
    – harrymc
    Aug 8, 2022 at 11:28

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