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picoCTF Writeup picoGym Practice Challenges Some Assembly Required 2 (注意<spoiler>)

Posted at

Some Assembly Required 2

Description
http://mercury.picoctf.net:61778/index.html

問題からしてweb assemblyのことを聞かれているので
wasm->5655afae
を見るとコードの最後の方にxakgK\5cNs((j:l9jnn:j=lu\00\00
と書かれてる。

https://dencode.com/ja/
デコードしようとしても出てこない。

CyberChefを使う。

inputにxakgK\5cNs((j:l9jnn:j=lu\00\00を入力

OperationsからMagicを検索しRecipeにドラッグ

intensiv mode にチェックし

Cribにキーワード(ここではpico)を入力しoutputでフラグにあたりそうなのをさがす

picoCT=kF{  b2d14eaec72c31305075876bff2b5d}T88T88

いらなさそうな部分を消せばフラグとして提出できる。

picoCTF{ b2d14eaec72c31305075876bff2b5d}

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