Space Ahoy

DESCRIPTION

Brian tries to send some crucial information from the spacestation about an impending disaster through a super secure line to his friend through a picture. Help his friend uncover the truth .. Author: Rakhul FLAG FORMAT: dsc{[a-zA-Z0-9_]+}

Solution

• Running strings on the given jpg file we can see there are 2 files embedded in it

  • SupEr_s3CrET_AuD10.wav

  • hidden.jpg

• There is an interesting comment which we can get by running exiftool super_secret.jpg which says

 Comment: the aliens are here try slowscan

• This comment will be useful later

• We can extract the files using binwalk -e super_secret.jpg

• We get hidden.jpg which has files embedded in it

• Again binwalk -e hidden.jpg gives us a wav file

• The comment comes into play here: the aliens are here try slowscan

• On reasearching about slowscan, I came across Slow-Scan Television which is picture transmission method.

• To decode this there is a tool called QSSTV. Check this article for installation

• There is an alternate way to give the wav file to qsstv instead of using pavucontrol

  • Options > Configuration > Sound > Sound Input > From File

• After setting up QSSTV and running it we get an image with a qr code on the top left

qr

• Scanning the qr code gives us the flag

• Flag: dsc{un5af3_sp4C3_coD3}