Big Boss

画像ファイル crypto04.png が与えられ、flag{FirstName_LastName} の形式のターゲットの個人の名前を要求された。

画像を見ると、ノートのようなものに文字が書かれているようだった。
最初の部分を書き出すと

An image file crypto04.png was given and the name of the target individual was asked in the format: flag{FirstName_LastName}.

Looking at the image, I found that there are some characters written to something like a notebook.
Writing down the first part of the characters, it was:

Hvs bslh asshwbu kwzz ps hcrom oh bccb.

となり、これにCyberChefのROT13 (Amount: 12) をかけると

And applying "ROT13" (Amount: 12) on CyberChef to the text resulted in this:

The next meeting will be today at noon.

となった。

残りの部分も書き出し、同様にROT13 (Amount: 12) をかけると、以下のようになった。

Then, I wrote down the rest part and applied "ROT13" (Amount: 12). This is the result:

The next meeting will be today at noon. Need to find ouz
Jimmie's wors schedule so we know when is best to phish
him. The campaihn needs to loos like it came from
ihs boss, Marcus Byner. He works as an Advanced
Solutions Supervisor-don't forget to include
that in the email.

この中から人名っぽい部分を抜き出し、整形することで、flagが得られた。

I obtained the flag by taking the part that looks like a name of a person from this text and formatting.

flag{Marcus_Byner}

DEADFACE CTF