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picoCTF Practice Writeup 7

Last updated at Posted at 2021-04-27

picoCTF Practice Writeup 7
picoGym Practice Challenges page=7 の4問を勉強した記録

WaniCTF'21-springが始まるので途中だけど,公開しとこっと。

このページの難問は,
240 solves の Let's get dynamic (gdbの問題)

shark on wire 1

Category: Forensics
Description:
We found this packet capture. Recover the flag.
Hints:
1. Try using a tool like Wireshark
2. What are streams?

Solution:
7,091 solvesの割りには苦戦した。
Protocol HierachyやConversationsとか見ても目立ったものが無い。
ヒント頼み。
UDP Stram eq 1 から順番に見ていく
image.png
赤ペンで丸したところをポチポチする。
UDP Stram eq 6
image.png
ビンゴ

extensions

Category: Forensics
Description
This is a really weird text file TXT? Can you find the flag?

Solution:
拡張子をpngに変えるだけ。

What Lies Within

Description:
There's something in the building. Can you retrieve the flag?
Hints:
There is data encoded somewhere... there might be an online decoder.
image.png

Solution:
青い空を見上げればいつもそこに白い猫
赤色ビット0 に反応
image.png
なんか変
image.png
緑色ビット0 に反応
image.png
青もかな?
image.png
ビンゴ

Let's get dynamic

picoCTF Practice Let's get dynamic をGhidraで解いたが。。。

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