FooBar CTF 2021: Bulky Load

Bulky Load

Category: Forensics/Steg

100 points

Unfortunately enough, Sharks do not have an organ for making sound…:(

author : Brad Hawk

File: find_me.pcapng

Solution

Attached file is USB traffic recorded and saved into pcapng file.

I used Wireshark to to extract the data sent thru the medium. Then I’ve combined the data to one file, which turned out to be wav file (ok, I knew it’s a wav from the first moment when I saw the data in Wireshark).

Once played, it sounds like a chirping. Without better idea I’ve used Sonic Visualizer to take a look into the spectrum.

flag

Yup, it’s the flag I was looking for.

Flag

GLUG{p17ch_0v3r_7R4FF1C}

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