Guide [Source] Roblox Hyperion — Internal Code Analysis and Reversing

[byte_corvus]

Taking a look at the internals of Hyperion (Byfron). This is a technical breakdown of specific code paths found during static analysis and decompilation of the Roblox binary.

Binary Logic Breakdown
At loc_7FFFF57584AB, the code performs a move operation on the EAX register. Decompiling this specific segment into C/pseudo-code reveals how the integrity or dispatch logic handles specific memory addresses and return pointer validation.

The execution flow starts by gathering references to all local variables (like v13, v8 in the stack frame) which are used for subsequent equality checks and arithmetic comparisons.

Technical Implementation

1. Initial address check: The anti-cheat verifies if a specific address is an unsigned int64.
2. Memory Operation: It triggers a memory access at the address

   0x1680B1D2583F641

   (DWORD).
3. System Flag Check: It evaluates

   MEMORY[0x7FFE0240] & 1

   . If this bit is set — typically related to system time or shared data flags — it proceeds to validate the return address.
4. Return Address Validation: If the retaddr returns as an unsigned__int64, the routine executes the call to the memory address.

Spoiler: Internal Structures and Obfuscation

// Arithmetic logic used for target verification
if ( (void **)((char *)&stru_7FFFF6470AD0[14284].spare + 6) == (void **)(0xDE098F112EAA56DAuLL * (a7 | 1) - 1095612051) )

Significant Addresses Identified:
- Jumpout Target:

0x7FFFF573869A

(signed int64)
- Call Target:

0x7FFFF5738738

(signed int64)
- Static Structure:

stru_7FFFF6470AD0

(Encoded data seen in IDA View as windows-1252)
- Data Segment:

byte_7FFFF64AE480

(BYTE[84])

Analysis and Risks
This looks like a part of the virtual machine or a mutation check designed to verify the calling context. The check

byte_7FFFF64AE480

being verified as unsigned__int64 suggests a type-confusion or integrity routine. Messing with these without understanding the recursive side effects on the return address or the system-shared data bit will lead to a flags being set or an immediate crash.

Anyone else digging into these signed int64 jumpouts in the latest binary?