ZUCTF | MEME
let’s see what the image contains…
i think there is a missing part put b4 that let’s using exiftool on Linux.
Haha, nice joke! I’m not that stupied!
If you open the image, you will notice that there is a missing part of it.
So, I think that if we adjust the size, we will get the full image.
so I’ll use HXD to edit it,
Open the image with HxD to fix the values in the PNG format.
We note that the values need to be modified.
Here it’s after editing,
export the image to see if it contains anything.
Oh, I expected this. Let’s take these numbers to find out what they indicate. I will try the Base64….
mmmm… I think if we convert these pairs of numbers into decimal values by dividing them by 2
after that let’s decode them on CyberChef…
great! we get the Flag!
Flag: ZUCTF{good_J00b_You_Find_The_flag}
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