ATIS (Smart Airspace, 200p)

You have a suspicion that in addition to the ransomware, data is also exfiltrated out of the ATC networks.
All outbound traffic is monitored but new data is still appearing in the dark web
From when the attacks started, ATIS has been getting continuous phone calls.
Maybe it's worth investigating?

Investigate the ATIS call to see if you can find anything odd!

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solution

This is classic steganography task, where spectrogram of audio file reveals the flag. Screenshot from Audacity software.

Flag is ctf-tech{f571324-9bd3}.