I actually discovered a Modern Day Korihor amidst the church who has a work that is intended to deceive and fits perfectly into the LDS theology to lead LDS members astray!
I started reading his work before I really knew what it was and found myself intrigued. As I consulted with another priesthood holder and compared it to what I knew to be true, I detected that it was really of Satan and that this work had a form of godliness but sought to undermine the work of the latter days. It was a pretty evil-inspired work, very very sneaky. And it sought to reclaim us much like Korihor and was trying to save us from distorted teachings yet.....had so many its self.
I won't say where it is or what it was, but I will say, if things don't come through proper church channels - through the Lord's channels - then we can be assured it isn't of God if it purports to be from God.
Perhaps that's what I need to look at first before I go reading things.