Talking Duck

V1t CTF 2025StegoBy @RawrWriteup by @xabito

Bro this duck is talking to me or something? I’m high or what??

Attachments

Recon

Upon listening to the file, it sounds like the duck is making “short” and “long” quacks. This immediately suggested Morse code to me. To analyze this further, I opened the audio file in Audacity and used the spectrogram view to visually interpret the signal.

Spectrogram analysis

Flag capture

By translating the pulses into Morse code, we obtain the following sequence:

...- / .---- / - / -.. / ..- / -.-. / -.- / ... / ----- / ... / ... / ----- / ...

Decoding that sequence using any Morse tool reveals the message: V1TDUCKS0SS0S.

Flag: V1T{DUCK_S0S_S0S}