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8 of Hearts: Metasploit 2020 December CTF

On port 4545 of the Metasploit 2020 December CTF target machine, two files were available for download: 8_of_hearts.elf and 8_of_hearts.enc. The .elf file was a Linux ELF executable program, and the .enc file was presumably an encoded PNG flag file.

If you ran it, and entered some input, you'd be chided for not entering "buffalo". If you entered "buffalo", you'd be told "MOAR buffalo!":

In retrospect, we now know everything we need to know in order to solve it. But since I was thick, I decided to disassemble the code and try to understand what I needed to do.
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