caoyin

hook lua-loadbuffer and inject our modified script

To save time Many game-developer are trying to make unity game with some third-part lua plugin such as Slua or Xlua In this developing mode the source code are not in Ida but in lua script compressed in unity bundle asset.I found that many hackers dont know much about how to crack such game.so i decided to make a tut for that in detail and share my own lua tool to help you read rua bytecode.you cant find such tool anywhere except here. Slua github:https://github.com/leinlin/slua Xlua：https://github.com/Tencent/xLua --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Luajit wiki：http://wiki.luajit.org/Bytecode-2.0 ;explaining how the luajit Vm bytecode work is complicated so please study it on your own Luajit dis-asm tool: https://armconverter.com/luatools/ or https://iosddl.net/2d385e1427003585/jit.rar Usage:luajit -blg XXX Luajit example:https://imgur.com/vKWVyrZ --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The lua dis-asm tool are only work on lua version 5.3.5 The lastest version is 5.4 i will keep updating and sharing it to public Lua5.3.5 wiki:https://the-ravi-programming-language.readthedocs.io/en/latest/lua_bytecode_reference.html Lua5.3.5 dis-asm tool：https://iosddl.net/82d5111f913c37bc/luac.exe Lua5.3.5 example:https://imgur.com/JsjfWdm Usage: -l list bytecode -d decompile bytecode -i dump instruction -o name output to file 'name' (default is "luac.out") -p parse only -s strip debug information -v show version information -- stop handling options - stop handling options and process stdin -iABC make a iABC instruction -iABx make a ABx instruction -iAsBx make a AsBx instruction -iAx make a iAx instruction --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- //inject code example #include <Foundation/Foundation.h> #include "Config.h" #include <sys/socket.h> #import <AudioToolbox/AudioToolbox.h> #include <sys/sysctl.h> #import <AdSupport/ASIdentifierManager.h> #import "MediaPlayer/MPVolumeView.h" #import "AudioToolbox/AudioToolbox.h" #include <sys/stat.h> #include <mach-o/dyld.h> #include <mach-o/dyld.h> #include <mach-o/ldsyms.h> #include <OpenGLES/ES2/gl.h> #include <OpenGLES/ES2/glext.h> #include <vector> # include <stdio.h> # include <stdlib.h> //modified lua script with winhex unsigned char data[3410] = { 0x2D, 0x2D, 0x20, 0xE4, 0xBC, 0xA4, 0xE5, 0xAE, 0xB3, 0xE8, 0xAE, 0xA1, 0xE7, 0xAE, 0x97, 0x0D, 0x0A, 0x66, 0x75, 0x6E, 0x63, 0x74, 0x69, 0x6F, 0x6E, 0x20, 0x63, 0x61, 0x6C, 0x63, 0x75, 0x6C, 0x61, 0x74, 0x65, 0x44, 0x61, 0x6D, 0x61, 0x67, 0x65, 0x28, 0x61, 0x74, 0x74, 0x61, 0x63, 0x6B, 0x5F, 0x74, 0x79, 0x70, 0x65, 0x2C, 0x20, 0x61, 0x74, 0x74, 0x61, 0x63, 0x6B, 0x2C, 0x20, 0x64, 0x61, 0x6D, 0x61, 0x67, 0x65, 0x46, 0x72, 0x6F, 0x6D, 0x2C, 0x20, 0x64, 0x61, 0x6D, 0x61, 0x67, 0x65, 0x54, 0x61, 0x72, 0x67, 0x65, 0x74, 0x29, 0x0D, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x2D, 0x2D, 0x5B, 0x5B, 0x6C, 0x6F, 0x63, 0x61, 0x6C, 0x20, 0x64, 0x61, 0x6D, 0x61, 0x67, 0x65, 0x20, 0x3D, 0x20, 0x30, 0x0D, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x6C, 0x6F, 0x63, 0x61, 0x6C, 0x20, 0x64, 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const void* p, size_t sz, void* ud); _lua_Writer lua_Writer; typedef int (*_lua_dump) (void *L, _lua_Writer writer, void *data); _lua_dump lua_dump; int MemoryWriter(void* ls, const void* p, size_t sz, void* ud) { writeToFile(p,sz); return 0; } typedef const char* (*_lua_tostring)(void *L, int index); _lua_tostring lua_tostring; int (*_loadbuffer)(void* L, const char *buff, size_t sz, const char *name); int i = 0; // used as dumped file name //L = lua state //buff = script bytecode //sz = script size //name = script name int $loadbuffer(void* L,const char *buff,size_t sz,const char *name) //hook loading function to dump all script of game { /*dump lua script to documents folder std::string path(N2C(NSHomeDirectory())); //get app home Directory N2C mean convert NString to C_string path = path + "/Documents/" + std::to_string(i); //name dumped script with number in order FILE* file = fopen(path.c_str(),"wb+"); //create file handle i++ fwrite(buff,sz,1,file); //write buff to file fclose(file); */ //inject if(sz > 100 && memcmp((void*)buff,(void*)data,100) == 0) //if buff is target lua then replace the original buff with ours { return _loadbuffer(L,(const char*)data,sizeof(data),name); //return modified script } return _loadbuffer(L,buff,sz,name); //if not target return original lua script } CNConstructor(SexyAss) { MSHookFunction( ((void*)CNAddr(0x0015D5A0 + 1)) , (void *)$loadbuffer, (void **)&_loadbuffer); // hook lua_loadbuffer }

The following code are my old bulletforce + critical ops hack. hope that can help you to do aimbot+esp hack // Critical Ops [Hidden Content] // Bullet Force [Hidden Content]

cool

thank you bro