This article from Film School Rejects says the following:
The Marvel Cinematic Universe has taken obscure properties like Guardians of the Galaxy and Ant-Man and turned them into blockbusters. One of the hardcore fans’ more requested lesser-known characters to enter the fray has been Marc Spector, aka Moon Knight. There have been hints of his existence in Captain America: The Winter Solider and Netflix’s The Defenders, yet there hasn’t been any news of him being introduced beyond an Easter egg.
I re-watched Captain America: The Winter Soldier to see if I could spot the reference, but I didn't. I even paused and read all the names that the helicarriers target for extermination during the final battle to see if they slipped in a "Marc Spector" or a "Steven Grant" somewhere, but I didn't see it. I wasn't quite willing to re-watch all eight hours of The Defenders to look for a reference, but I didn't remember anything obvious.
Are there actually references to Moon Knight in these (or any other) Marvel Cinematic Universe properties?