Hidden Flag

Url: http://ctf.infosecinstitute.com/misc/readme.wav
Description: readme.wav

Solution:
This hidden challenge can be seen using command execution on levelfifteen, there is a misc folder.

level-hidden

Using Audacity audio tools open the readme.wav, it contain the morse code sound, to more clear you can, choose the dropdown readme on the left then choose Pitch (EAC), see image below

audacity-pitch

the output will be

bonus-readmewav

Let assume the small like dot is a dot, and the bigger one is dash, then I collect all, the result is

.. -. ..-. --- ... . -.-. ..-. .-.. .- --. .. ... -- --- .-. ... . -.-. --- -.. . - --- -. . ... 

Using online tools to decode it, you got the flag

The flag is: INFOSECFLAGISMORSECODETONES

Reference and Tools:
1. Morse code – http://en.wikipedia.org/wiki/Morse_code
2. Morse code decoder – http://morsecode.scphillips.com/translator.html
3. Audacity – http://audacity.sourceforge.net/

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