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HITCON CTF Quals - 2019

Misc / 198 - EmojiiVM

It's time to test your emoji programming skill!

Make sure to check out readme.txt before you enter the challenge :)

nc 3.115.122.69 30261

Notice:

Make sure you send exact N bytes after you input N as your file size.

Otherwise the server might close the connection before it print out the flag !

Author: bruce30262

66 Teams solved.

Solution

By @jaidTw

It's basically an assembly language challenge and the solution must < 2000 bytes. Computing branch target is bothering because address should be composed from 0 ~ 10, but we can use NOP padding to avoid affecting adderss.

sol.em misc.py