C:\CTF\GASLIGHT\GOODLUCK.EXE _□X

GOOD-LUCK!

forensics 238 solves by riyc

Challenge

Good luck!

File given: goodluck2.mp3

Approach

On the left ear, its a woman saying "Good Luck" over and over faster and faster. On the right side you hear a weird noise. Thats a sign you should check the spectrogram on that side.

import soundfile as sf
import matplotlib.pyplot as plt

data, sr = sf.read("goodluck2.mp3", always_2d=True)
right = data[:, 1]

fig, ax = plt.subplots(figsize=(22, 6), facecolor="black")
ax.specgram(right, NFFT=1024, Fs=sr, noverlap=1000, cmap="inferno")
ax.set_ylim(500, 3600)
plt.savefig("spectrogram_right.png", dpi=150, facecolor="black")

The right channel has a message drawn straight into it:

Spectrogram of the right audio channel showing text drawn into the frequency domain