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picoGym Exclusive writeup Big Zip

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Big Zip (General Skills)

Unzip this archive and find the flag.
・Download zip file

添付ファイル
・big-zip-files.zip

big-zip-files.zipの中をざっと見てみると大量のテキストファイルがある。おそらく、このどれかにflagが書かれているはず。
まず、unzipしてgrepで「pico」の文字列のあるファイル名を特定する。

> grep -rl pico ./big-zip-files/*
./big-zip-files/folder_pmbymkjcya/folder_cawigcwvgv/folder_ltdayfmktr/folder_fnpfclfyee/whzxrpivpqld.txt

whzxrpivpqld.txtに記述されている文字列を取得すると、

> strings whzxrpivpqld.txt
information on the record will last a billion years. Genes and brains and books encode picoCTF{gr3p_15_m4g1c_ef8790dc}

flagが得られた。

picoCTF{gr3p_15_m4g1c_ef8790dc}

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