# Bad Apple

## Description

Someone stumbled upon this file in a secure server. What could it mean?

[Bad_Apple.mp4](Bad_Apple.mp4)

## Solution

Watching the video we hear a strange noise that starts at `1:33`, let's extract the audio using `ffmpeg` and try to open it with audacity

At first glance, nothing is found, but observing the spectrogram we find a QR code



Let's try to improve the image


If we scan the QR code we get the flag


#### **FLAG >>** `dctf{sp3ctr0gr4msAreCo0l}`

Original writeup (https://github.com/K1nd4SUS/CTF-Writeups/tree/main/dCTF_2021/Bad%20Apple).