Only real hackers can use secret emojis.
See also: maze.liveoverflow.com
The author provided a game called
maze we have to solve some challenges to get the flags.
Inside the game the players can communicate by emoji. To get the flag we have to send the hidden flag emoji.
Il2CppDumper link to dump the game code. The code can then be examined by using IDA or Ghidra. I reverse engineered the netcode and wrote a simple proxy. After decrypting the packets using the following function:
def decode(data): dec=bytearray((len(data)-2)) key = data for i in range(2,len(data)): dec[i-2]=data[i]^key key = (key+data)%0xFF return dec
We get packets in the form
id[secret]data. The emoji packet has the id
69 and is structured like this:
id secret emoji_id 69|AABBCCDDEEFF0011|04
We can inject our own packet and set emoji_id to 13 to get the flag.
I implemented the command
emoji to do that.