Extra Info: Exclusive ON WRD: This new Anti-Cheat is called: "Krampus"

Thanks to reggie on v3rm for this <3



Before I start ranting, HUGE shoutout to @pizzaboxer for helping extensively in this, and noticing the channel itself in the integration FFlags, which I skimmed right over lol.



Hello, all!

For the past 2 weeks, a small few amount of people were made aware of a new Roblox deployment branch created under the name feature/win64_client_deploy_test. On 4/3/2022, the channel name for this branch was added to a public FFlag, which houses deployment channels which have been "blacklisted" internally; making the channel publicly known. In this case, "zfeaturewin64_client_deploy_test". (Which, with what we know about Roblox's internal git branching system, would be "feature/win64_client_deploy_test")

For multiple reasons, this was not previously disclosed by those who were aware of the channel. This has, for the most part, been kept 'private' for 2+ weeks.



So.. What exactly is this?
This channel contains the new, "unreleased" 64 bit version of Roblox's Windows client. Previously, the binary executables for the Windows player have been in x86 (32 bit). This change aready impacts every exploit/script util, and their respective codebases.

This alone will already require quite a few major changes for all exploit developers, but this is just the tip of the iceberg for win64..



Now for the more damaging information.. This is also the new implementation of Byfron's new AC/AT!
This channel also includes a new dll (not exe) for RobloxPlayerBeta, which is an all-new Byfron-obfuscated version of the game engine, and its related dependencies. (Luau, etc)

Just an early heads up; this breaks rbxfpsunlocker, custom shaders, and ANY exploit or program that interacts with the Roblox client directly.

This could take weeks to be properly reversed in any way, and potentially much longer for exploits to update their codebases with these changes in mind.



It's not joever yet.. This is not in production!
It could take another 1-2 months for this implementation of the 64 bit client to make it to production, which could give developers a bit of time to research and reverse the Byfron team's new binary obfuscation and anti-tamper codegen.

Besides, the client is by no means completely ready, and as of 4/3, had issues with texture loading, constant crashes, etc. It isn't perfect yet.



Links (for dev reversal & research)
These are various links for the channel's current DeployHistory, the lastest version's rbxPkgManifest.txt and RobloxApp.zip, and an archived version of win64's binaries.

⚠️ DISCLAIMER: YOU PROBABLY SHOULDN'T USE THIS CLIENT IN GAMES
Roblox is handing out half year bans for even using this client in prod games afaik; you have been warned I guess, lol. Drunk

DeployHistory: https://setup.rbxcdn.com/channel/zfeaturewin64_client_deploy_test/DeployHistory.txt
Latest Version's rbxPkgManifest: https://setup.rbxcdn.com/channel/zfeaturewin64_client_deploy_test/version-af6a93b0f15544f9-rbxPkgManifest.txt

RobloxApp.zip (*.exe & *.dll binaries): https://setup.rbxcdn.com/channel/zfeaturewin64_client_deploy_test/version-af6a93b0f15544f9-RobloxApp.zip
RobloxApp.zip (Archive): http://web.archive.org/web/20230412185623/https://setup.rbxcdn.com/channel/zfeaturewin64_client_deploy_test/version-af6a93b0f15544f9-RobloxApp.zip