> For the complete documentation index, see [llms.txt](https://docs.cooku222.kr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cooku222.kr/security/digital-forensics/dreamhack/dreamhack-audio-steganography.md).

# \[DreamHack] Audio Steganography

#### 문제 링크

{% embed url="<https://dreamhack.io/wargame/challenges/1660>" %}

#### 문제

<figure><img src="https://blog.kakaocdn.net/dna/n3gnP/btsNeBeKp5v/AAAAAAAAAAAAAAAAAAAAAHiANRsCBa7GSUNKgYvTdWHyOUZ0-AATa9xvBUm2PJtu/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=IvXGG%2B86l7ktz9Y9vaQVfd3kwVM%3D" alt="" height="167" width="361"><figcaption></figcaption></figure>

&#x20;

#### Writeup

이름부터 스테가노 -> WAV와 같은 오디오 스테가노니까 오디오 분석(지난번엔 이미지/영상 데이터여서 HxD로 다루는게 의미있었지만 오디오니까 다른 툴을 사용) 툴로 헥사값을 추출한 후 -> 뭔가 중첩된 파일 형식을 긁고 수정 후에 숨겨진 파일을 까보면 플래그 값이 있을 것이다 \~ 로 방향을 잡고 풀기

사실 HxD로 뻘짓하다가 다른 문제에서 힌트를 얻어서 audacity를 다운로드 받기로함

&#x20;

&#x20;

<figure><img src="https://blog.kakaocdn.net/dna/ll78c/btsNfQPpSJS/AAAAAAAAAAAAAAAAAAAAAB3HWjYzMTteCEyR0yf8eRWdrdviNbyBCw6eq7E90s3t/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=JB0C89ghc0leYdor9dWA0FoI%2BWs%3D" alt="" height="200" width="913"><figcaption></figcaption></figure>

깔고 압축을 풀면 Hi 오디오파일이 튀어나온다. 이걸 실행하면, &#x20;

<figure><img src="https://blog.kakaocdn.net/dna/rIpXG/btsNe3aY2EK/AAAAAAAAAAAAAAAAAAAAALurTnGqf5U1Kg-e0TLsyeKWfTmFkwsaQzcszeTjpOyD/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=IaWO5iqFv8QKCnZkqX%2FVBZnQBIc%3D" alt="" height="992" width="1276"><figcaption></figcaption></figure>

학교에서 듣는거라 음성 줄이고 들었는데 내가 너무 작게 해서 그런건지.. 딱히.. 뭐가 나오진 않는다.

{% embed url="<https://www.audacityteam.org/post-download/>" %}

요 사이트 들어가서 Audacity 툴을 깔아준다.&#x20;

<figure><img src="https://blog.kakaocdn.net/dna/bIXzv8/btsNf7pRlum/AAAAAAAAAAAAAAAAAAAAAGwi7valS-2SJT-HWy3sOWxP8hq2CkAqWdfdc5UFvk1n/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=4E41nibfVLAJGjkEyF2Vr7dARXg%3D" alt="" height="793" width="1371"><figcaption></figcaption></figure>

<figure><img src="https://blog.kakaocdn.net/dna/bE4wlg/btsNdXpihx2/AAAAAAAAAAAAAAAAAAAAAMtudh-9vAgIg61lGyCE5FZND8EssBeGNqtW7yN0syZV/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=o%2BGHJXjSZ48ELjQM2QSD2iafA7U%3D" alt="" height="355" width="1918"><figcaption></figcaption></figure>

Hi 파일의 좌측 상단의 X 창 옆에 여러 설정 누르다보면 스펙트럼 도식화가 있다. 그거 눌러서 확인하면

<figure><img src="https://blog.kakaocdn.net/dna/dSmHaN/btsNeyC3qES/AAAAAAAAAAAAAAAAAAAAADeQJ3mdkohr3SvLnzEjIwxPE_fGnxegktaZM2cXuiIh/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=i6iGiwhyvbwwBikDAkjTUoVK5ms%3D" alt="" height="88" width="1162"><figcaption></figcaption></figure>

플래그가 뜬다.

<br>


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