Challenge: Santa updated his Christmas carol playlist, but he noticed that the elves are trying to trick him again. He is listening to this song over and over again, but cannot decode it. Please help Santa to solve this audio mystery.

Attached file: WeirdXmasSong.wav

The file sounds just some static and strange artifacts. Googling for “hiding messages in sound files” would quickly show a few options, most notably the Spectogram variant.

This was easy.

Flag: xmas{He_knows_if_you’ve_been_bad_or_good}

What did I learn: Oh, I remember Audacity…