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CTF Writeups

UTCTF 2020 – Observe Closely

1. Use Binwalk to extract hidden binary.
2. Run hidden binary.

We were given an image:

Griffith_Observatory.png

Examining this image using Binwalk showed that there were additional files appended to the end of the image:

Using Binwalk to examine files in the image.

Extracting these files can be done using Binwalk as well. Once we did that, we saw that there was a hidden binary embedded in the image:

Extracting the hidden binary from the image.

Running this binary gave the flag:

Got the flag!

The flag was: utflag{2fbe9adc2ad89c71da48cabe90a121c0}

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