[Writeup] Vòng loại WhiteHat Grand Prix 2015: For200

[sunny]

Nguồn: ISITDTU (https://sugivo.wordpress.com/2015/10/28/whitehat-2015-global-challenge-phong-nha-ke-bang-forensic-200/)

Cảm ơn các bạn đã chia sẻ.

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Download file here
The organizers of the contest give us a pcap file. We open it and see many TCP protocol, this is data of audio that the organizers want us to hear.

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So, we open Conversation of pcap file and select TCP tab , it only TCP transmissions .Then I dump it by follow Stream -> Save As file. The raw data have size 801 kb.

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The next step requires experience we drop file in audacity and the software has display error.

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Next step, we choose file -> import -> raw data

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Last but not least, we listen carrefully to get the flag
Whitehat md5 of pcm underscore stream in and underscore and underscore twenty-fifteen all lowercase
WhiteHat md5 pcm_stream__in_2015