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Been digging into memory integrity and signature-based detection lately. Since we are dealing with a game using its own proprietary detection in a 64-bit Unreal Engine environment, I am looking at how to effectively neutralize pattern scanners. Even without EAC or BattlEye, a simple memory scanner looking for anomalies or static strings will fry your module if your loader is leaked or captured.
The Setup:
Current Thoughts on Evading Pattern Scanners:
1. Junk Macros & Control Flow Flattening:
Adding junk code/macros helps break up static byte signatures, but it is not a silver bullet. If your core logic remains the same (e.g., how you hook the vtable or iterate the entity list), the logic flow itself creates a signature. You need to combine this with instruction substitution—using different assembly sequences to achieve the same result so the generated opcodes aren't identical across builds.
2. Dynamic Re-compilation (Server-Side):
Your plan for on-demand server-side compilation is solid. It turns a static signature into a moving target. By forcing the compiler to randomize register usage, inline functions differently, and apply mutation passes on every request, you effectively kill the ability for them to build a reliable database of signatures.
3. Memory Scanning & Stealth:
Even if you mask the code, they can still perform a VAD (Virtual Address Descriptor) check to find memory regions marked as PAGE_EXECUTE_READWRITE or check for module hiding inconsistencies. If you are manually mapping, make sure you are properly cleaning up the PE headers and fixing the module list so your memory isn't flagged as "orphaned" memory pages.
My questions for the devs here:
The Setup:
- The Payload: DLL is protected via VMProtect and manually mapped.
- The Delivery: Decrypted only in memory, strings are obfuscated.
- The Risk: Even with VMP, if a dev gets their hands on a sample, they can just dump the memory, look for persistent byte patterns, and flag your module based on static signatures or hooks.
Current Thoughts on Evading Pattern Scanners:
1. Junk Macros & Control Flow Flattening:
Adding junk code/macros helps break up static byte signatures, but it is not a silver bullet. If your core logic remains the same (e.g., how you hook the vtable or iterate the entity list), the logic flow itself creates a signature. You need to combine this with instruction substitution—using different assembly sequences to achieve the same result so the generated opcodes aren't identical across builds.
2. Dynamic Re-compilation (Server-Side):
Your plan for on-demand server-side compilation is solid. It turns a static signature into a moving target. By forcing the compiler to randomize register usage, inline functions differently, and apply mutation passes on every request, you effectively kill the ability for them to build a reliable database of signatures.
3. Memory Scanning & Stealth:
Even if you mask the code, they can still perform a VAD (Virtual Address Descriptor) check to find memory regions marked as PAGE_EXECUTE_READWRITE or check for module hiding inconsistencies. If you are manually mapping, make sure you are properly cleaning up the PE headers and fixing the module list so your memory isn't flagged as "orphaned" memory pages.
My questions for the devs here:
- Obfuscation: Are you guys sticking to standard VMP, or are you layering it with custom polymorphic engines before the VMP pass?
- Hooking: What are you using for your hooks to avoid detection? If you are doing classic detours, the jump instruction is a massive beacon for scanners.
- Static Analysis: Beyond junk macros, what else are you doing to randomize the generated binary structure to prevent them from building a heuristic profile of your code?
