# treasure

• Category: Misc
• Points: 50

Romors say that something is buried in treasure.ctf.0ops.sjtu.cn,
happy treasure hunting. :)

If we ping the domain treasure.ctf.0ops.sjtu.cn, we'll get a loopback to our localhost.

We were able to find the IPv6 address of the domain: 2001:470:d:b28::40:1

A reverse DNS lookup on the IPv6 address.

The hint here is YouHaveReachedTheTreasure, that inspired us to traceroute that address.

Look at the binary code here, it seems the flag is somehow hidden inside.

If we highlight all 1s that looked like a part of a QR code.

But the code here was just a partial QR code, we needed more hops for the another half data:

The following python script converted binary data to an image file.

Got the flag: 0CTF{Reverse DNS is so FUN!}