PROBLEM
Casper found this image on his Trash folder, he is not sure who is the creator. Can you help him by finding it out ? We will reward you with a FLAG
SOLUTION
Well the first thing I tried was to see if our flag was in the strings and actually it was.
>>> strings ufo.jpeg | grep GLUG
GLUG{3x1f_15_n07_d34d}
FLAG - GLUG{3x1f_15_n07_d34d}