Bad ESC or motor?

One of my motors are acting nuts...:


Everything are brand new, never flown.

FC = Dji WKM
Motor = T-motor MN3515-15 KV4o0
ESC = Yeti HiCopter 40A Opto (Can not be programmed)

Is this a bad motor, or bad ESC or something else?

EDIT:
I tried the motor on one of the other ESC´s and it ran normal on that ESC. Also tried the ESC on another motor, with equal bad result. I guess the ESC was a bad one then?

Guess I will have to wait a few weeks more before the maiden flight.
 
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