This is a nice new CFW-ish thing from our good friend @yifan_lu (GW ultra reversing, spider3dstools). Obviously, don't install this unsigned module to sysnand or you'll likely brick.
Update: Here is a Writeup from the author's blog that explains how things work things nicely. It's in a conversation tone, so even novices might want to give it a read!
Update2: It appears 3ds injector...
3DS Injector
Update: Here is a Writeup from the author's blog that explains how things work things nicely. It's in a conversation tone, so even novices might want to give it a read!
Update2: It appears 3ds injector...
3DS Injector