there are apps that can do that, for example :
https://play.google.com/store/apps/details?id=com.jrummy.apps.build.prop.editor&hl=de
Why i ask you to change the value is: If you phone reports back as "samsung" the app will think you are running an original samsung rom and will rely on many touchwiz framework features, thats why i asked you to change it something else
Best Regards