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Cheating in Online Video-Games

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Cheating in Online Video-Games Cheating in online video-games Adrien Garin Introduction Code Cheating in online video-games modification An example with CS:GO Code injection Offsets Valve Anti Cheat Adrien Garin No Flash ESP EPITA Conclusion July 18, 2015 Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 1 / 37 Intro Cheating in online Counter Strike: Global Offensive (2012) video-games Source Engine (2004) Adrien Garin Prize Money Awarded: $5,269,708.88 (4 July 2015) Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Adrien Garin (EPITA) CheatingFigure: in online CS:GO video-games ingame July 18, 2015 2 / 37 What do we want Cheating in online video-games Adrien Garin Introduction Code modification AIMBOT / Trigger BOT Code injection No Flash Offsets Wall hack Valve Anti Cheat ESP No Flash Radar Hack ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 3 / 37 Cheat theory Cheating in online video-games Adrien Garin Introduction Code modification Change code in .text Code injection Players attributes and info are in memory Offsets Find the good addresses Valve Anti Cheat Objects are very often dynamically allocated No Flash Hooking ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 4 / 37 CSGO code Cheating in online video-games Adrien Garin Introduction Code modification csgo.exe (resources loading, some checksums) Code injection client.dll (C BaseEntity, EntityList, LocalPlayer, Offsets RadareBase. ) Valve Anti Cheat engine.dll No Flash server.dll ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 5 / 37 Infinite money Cheating in online video-games Adrien Garin Introduction Code modification Current money is in memory Code injection Offsets Use Cheat Engine to find where Valve Anti Then find which instruction wrote to this address Cheat No Flash Patch it ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 6 / 37 Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: Money IDA Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 7 / 37 Why Cheating in online video-games Adrien Garin Introduction Code modification Code injection We need to read and write to game memory Offsets We also want to hook some stuff Valve Anti Cheat We have to inject code No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 8 / 37 Internal vs External Cheating in online video-games Adrien Garin Introduction Code modification Code injection You can access the game internally or externally from Offsets another process Valve Anti Cheat Internal cheats can call game functions No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 9 / 37 LoadLibrary Cheating in online video-games Adrien Garin Introduction Classical method is to call LoadLibrary Code modification Or LdrLoadDll Code injection allocate memory for the string my module.dll in remote Offsets process Valve Anti Cheat Write the string at allocated address No Flash Create a new remote thread which will execute ESP LoadLibraryA Conclusion But it is not stealth Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 10 / 37 PEB Cheating in online video-games typedef struct _PEB { Adrien Garin BYTE Reserved1[2]; Introduction BYTE BeingDebugged; Code modification BYTE Reserved2[1]; Code injection PVOID Reserved3[2]; Offsets PPEB_LDR_DATA Ldr; Valve Anti PRTL_USER_PROCESS_PARAMETERS ProcessParameters; Cheat BYTE Reserved4[104]; No Flash PVOID Reserved5[52]; ESP PPS_POST_PROCESS_INIT_ROUTINE PostProcessInitRoutine; Conclusion BYTE Reserved6[128]; PVOID Reserved7[1]; ULONG SessionId; } PEB, *PPEB; Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 11 / 37 Get PEB Cheating in online video-games Adrien Garin PEB address is in segment register FS Introduction Code modification Getting PEB Code injection PPEB peb; Offsets Valve Anti Cheat __asm No Flash { ESP mov eax, FS:[0x30] Conclusion mov peb, eax }; Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 12 / 37 Iterate Ldr LinkedList Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: PEB Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 13 / 37 Manual mapping Cheating in online video-games Adrien Garin Introduction Code modification Allocate enough space in remote process heap Code injection Patch relocations Offsets Load dependencies Valve Anti Cheat Patch imports No Flash Stealthier than LoadLibrary ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 14 / 37 Differences with ELFs Cheating in online video-games Adrien Garin Introduction Code modification Code injection Elfs use position independant code Offsets Dlls don't Valve Anti Cheat Dlls are always relocated by the kernel memory manager No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 15 / 37 PE Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: Portable Executable Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 16 / 37 Relocations Cheating in online video-games Adrien Garin IMAGE BASE RELOCATION Introduction Num relocs = (SizeOfBlock - 8) / sizeof(WORD) Code modification The high 4 bits are a relocation type Code injection Offsets The bottom 12 bits are offsets Valve Anti Cheat struct IMAGE_BASE_RELOCATION No Flash { ESP DWORD VirtualAddress; Conclusion DWORD SizeOfBlock; }; Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 17 / 37 Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: Relocation block Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 18 / 37 Import and IAT Cheating in online video-games Adrien Garin Introduction Code modification Code injection Use LoadLibrary to load dependencies Offsets Valve Anti patch IAT Cheat No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 19 / 37 Getting offsets Cheating in online video-games Adrien Garin Introduction Code modification We have a static pointer in .bss section Code injection We have to find its location Offsets Valve Anti Cheat C BasePlayer.cpp No Flash static C BasePlayer *s pLocalPlayer = NULL; ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 20 / 37 Sigs Cheating in online video-games Adrien Garin Introduction Code modification Code injection Game client is often updated Offsets Offsets change Valve Anti Cheat We don't want to waste time No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 21 / 37 Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: LocalPlayer offset Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 22 / 37 Cheating in online video-games Instructions Adrien Garin lea esi, [eax * 4 + XXXX] Introduction mov [XXXX], edx Code mov eax, [ecx + 0x8] modification mov ecx, [eax + 0x4] Code injection Offsets Signature Valve Anti Cheat const uint8_t sigs[] = No Flash { ESP 0x8D, 0x34, 0x85, 0x00, 0x00, 0x00, 0x00, Conclusion 0x89, 0x15, 0x00, 0x00, 0x00, 0x00, 0x8B, 0x41, 0x08, 0x8B, 0x48, 0x00 }; Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 23 / 37 Protecting offsets Cheating in online video-games Adrien Garin Introduction Code modification Some cheaters want to protect offsets by packing their Code injection cheat Offsets IAT is destroyed you can't hook WPM Valve Anti Cheat But you can still hook the native API No Flash WriteProcessMemory uses NtWriteVirtualMemory in ntdll ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 24 / 37 VAC Cheating in online video-games Adrien Garin Several modules Introduction Code Not in FS modification Loaded by steamservices.exe Code injection Offsets Encrypted in .data Valve Anti manuel mapped into steam.exe Cheat No Flash Not loaded in the same time ESP No information available when you get banned Conclusion Bans are delayed No kernel module Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 25 / 37 Dump Cheating in online video-games Adrien Garin Introduction Code modification 1 Put a BP in steamservices.exe just before it injects Code injection steam.exe Offsets Valve Anti 2 Find where VAC is located in .data Cheat 3 Dump No Flash ESP Conclusion Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 26 / 37 Cheating in online video-games Adrien Garin Introduction Code modification Code injection Offsets Valve Anti Cheat No Flash ESP Conclusion Figure: Dump VAC IDA Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 27 / 37 Behaviour Cheating in online video-games Adrien Garin Introduction Checksums game binaries Code modification Checks if you disabled DSE on Windows x64 Code injection Checks if you hooked stuff in kernel32.dll Offsets Valve Anti It was checking your DNS cache Cheat Read memory of process which opened a handle on No Flash ESP csgo.exe Conclusion It looks for known public injectors Adrien Garin (EPITA) Cheating in online video-games July 18, 2015 28 / 37 Loaders Cheating in online video-games Adrien Garin Introduction Code VAC uses mainly signatures modification If
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