title: Found user 'l_certSignSmDetach' in security logins and don't know what it is for
body: <p>I was working in my local instance of Microsoft sql server management studio today when I noticed a user that I don't remember seeing before named <code>l_certSignSmDetach</code>.  It didn't appear to have access to any individual database mapped to it (I frequently delete and restore dbs on this server so it's possible that whatever it was attached to has been since deleted).  I googled this username, and couldn't find anything helpful to indicate if it's supposed to be there.  I have disabled the access to the db engine and disabled the login.  </p>
  
  <p>Can anyone give me information on this username if it is in fact used for something helpful?  </p>