Reverse Engineering - file-run2 - writeup

description

Another program, but this time, it seems to want some input. What happens if you try to run it on the command line with input “Hello!”?

Download the program here.

writeup

by simply executing the file with ./run we get

1

Run this file with only one argument.

if I try to supply one argument like this: ./run 1 I get

1

Won't you say 'Hello!' to me first?

So once I try to supply an argument like this: ./run Hello! I get

1

The flag is: picoCTF{F1r57_4rgum3n7_c2db2786}