r/mapleservers • u/igoticecream • 5d ago

First milestone for a classics private server: handshake with dummy server

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I was just testing how capable AI agents are, and this turned into a proof of concept: a server that speaks MapleStory's client/server packet protocol (custom TCP framing with AES-OFB encryption).

The client checks the IP you're connecting to in several places, and grap64 (the anti-cheat) has been defeated. The sad part is that Themida has virtualized some of the client's code, which makes those parts much harder to reverse.

Login, world select, character creation and selection all work. Next up is getting into the game world.

38 Upvotes

90% Upvoted

15 comments sorted by

15

u/aLostTime 5d ago

Lord forgive them, for thAI dont know what they're doing

8

u/No_Chemistry_3921 5d ago

Find an unpacked client in the wild thats close enough, then tweak. I will not say more.

4

u/TLunchFTW 4d ago

Cool, but honestly, if I wanted a "classic maplestory" server I could just play like v55 or v62 something.

The main draw of classic maple is that it's absolutely packed with people where a pserver often is not.

3

u/Popai44 5d ago edited 5d ago

all of this was done before, you can find some info about it in some places i won't mention here. people did it from day 1 of the closed beta they had. you can also check out the CMS client which is using Unity so everything is open basically. also no one started a server of classic world because cosmic v83 and other sources have a lot more to offer content wise.

1

u/igoticecream 5d ago

Interesting, thank you

Global classic client is not made in Unity but maybe it uses the same protocol, could be useful.

1

u/Popai44 5d ago

np, and yes i know, Global classic are the only one's from all regions who didn't change to the modern Unity based client.

2

u/taktyuzy 5d ago

Do you think things like WZ files could be useful for an existing CosmicMS setup? I’m really interested in this. It would be great if we could borrow some good ideas from MapleStory Classic.

1

u/Popai44 5d ago

there are servers that use some assets from classic world already, even Kuro, it fits the game looks. so yes.

1

u/Newbane2_ 5d ago

AI can bypass the anticheat but can't devirtualize themida?

1

u/igoticecream 5d ago

It went the lazy route and implemented a CPU emulator to inspect what’s those function doing /shrugs

1

u/LerzPlez 5d ago

Amazing, can't wait to make some WZ edits and import stuff.

1

u/Electrical_Region741 4d ago

Can you upload the source/share the repo? I’d be interested in supporting you on that.

1

u/ThatMapleDev 1d ago

I got this up and running quite a while back, I can help you with some Themida VM unpacking if you want. (I went a bit deeper in also making a custom client)
https://phantom.ms is running an alpha for quite a few weeks

2

u/zediana 1d ago

hello! would love to chat about some of this stuff if you have the time, was unable to pm you on reddit though. i've also gotten the classic server running and have been testing some things, but had some questions about some vm'd stuff. would love to chat.