Use a disassembler and try to understand what the program does. There's no need to guess anything.
Well, maybe easy for someone who knows what they are doing, but for someone starting from 0, this is great place to learn, even if I start from basics and do it in dumb way (ni and info).
IDA free version worked great
For this challenge, I motivated myself to use ghidra for the first time.
Conclusion: the decompiler makes this easy. :)
I think these are good hints.
2 months ago
just too weak. change to ez insteed