在之前写注入都是32位exe文件注入32位dll到32位exe文件中，或者都是64位。但是之前看到关于32位进程注入64位进程的方法，将学习笔记记录下来。
之前的文章：注入小结
我们需要借助GitHub上的开源库rewolf-wow64ext 这个库的目的就是让运行在Wow64环境中的x86应用程序可以直接调用x64下ntdll.dll中的Native API。通过这个开源项目我们大致可以知道：
①在x64下的进程，不管是32位或者是64位，实际上都映射了两个地址空间，一个是32位，一个是64位。相当于一个进程的两种工作模式，而且这两种工作模式是可以进行切换的;
②Wow64进程中的r12寄存器指向64位的TEB结构(TEB64);
③每个32位进程都会加重ntdll32.dll和ntdll.dll模块。其中ntdll.dll是64位模块，我们可以将进程的32位模式改为64位模式，然后再去操作64位进程。
具体的操作：
① 进程的32位模式改成64位模式
#define X64_Start() X64_Start_with_CS(0x33) #define X64_End() X64_End_with_CS(0x23)
在wow64ext中对x64 api进程调用时，使用X64_Start_with_CS(0x33)设置进程的’运行模式”为64位。
#define EMIT(a) __asm __emit (a) #define X64_Start_with_CS(_cs) \ { \ EMIT(0x6A) EMIT(_cs) /* push _cs */ \ EMIT(0xE8) EMIT(0) EMIT(0) EMIT(0) EMIT(0) /* call $+5 */ \ EMIT(0x83) EMIT(4) EMIT(0x24) EMIT(5) /* add dword [esp], 5 */ \ EMIT(0xCB) /* retf */ \ } #define X64_End_with_CS(_cs) \ { \ EMIT(0xE8) EMIT(0) EMIT(0) EMIT(0) EMIT(0) /* call $+5 */ \ EMIT(0xC7) EMIT(0x44) EMIT(0x24) EMIT(4) EMIT(_cs) EMIT(0) EMIT(0) EMIT(0) /* mov dword [rsp + 4], _cs */ \ EMIT(0x83) EMIT(4) EMIT(0x24) EMIT(0xD) /* add dword [rsp], 0xD */ \ EMIT(0xCB) /* retf */ \ }
可以看到主要是借助retf将CS寄存器的值设置为0x33。这里提一下题外话，可以百度一下ret，iret和retf三者之间的区别。
②获得目标函数所在模块(ntdll.dll)在x64模式下的加载基地址：
#define X64_Push(r) EMIT(0x48 | ((r) >> 3)) EMIT(0x50 | ((r) & 7)) DWORD64 getTEB64() { reg64 reg; reg.v = 0; X64_Start(); // R12 register should always contain pointer to TEB64 in WoW64 processes X64_Push(_R12); // below pop will pop QWORD from stack, as we're in x64 mode now __asm pop reg.dw[0] X64_End(); return reg.v; }
关于TEB的获得是通过r12–>TEB64—>PEB—>LDR匹配到ntdll.dll来找到ntdll.dll的加载基地址。
③解析PE结构找到目标函数在”x64模式”下的真实地址(GetProcAddr())。
④通过函数地址调用”x64模式”下的目标函数。这里要注意x64函数调用约定的改变，前4个参数通过rcx,rdx,r8,r9来传递，之后通过堆栈传递。X64Call()已经封装好了。
接下来我们可以开始实际的工作了。
NTSTATUS NTAPI RtlCreateUserThread( _In_ HANDLE processHandle, _In_ SECURITY_DESCRIPTOR* securityDescriptor, _In_ BOOLEAN createSuspended, _In_ ULONG stackZeroBits, _Inout_opt_ size_t* stackReserved, _Inout_opt_ size_t* stackCommit, _In_ const void* startAddress, _In_ void* startParameter, _Inout_ HANDLE* threadHandle, _Inout_opt_ CLIENT_ID* clientID );
NTSTATUS NTAPI LdrLoadDll( _In_opt_ PWSTR SearchPath, _In_opt_ PULONG LoadFlags, _In_ PUNICODE_STRING Name, _Out_opt_ PVOID *BaseAddress );
VOID
NTAPI
RtlExitUserThread(
_In_ NTSTATUS Status
);不同于之前利用CreateRemoteThread()来创建线程。因为CreateRemoteThread()是由Kernel32.dll导出的，wow64ext这个库只针对ntdll.dll(同理LoadLibrary也不能调用)。所以采用ntdll中未文档化的RtlCreateUserThread()来创建远程线程，LdrLoadDll()加载dll，在远程线程中调用RtlExitUserThread()终止远程线程。
// Wow64Injectx64.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include "Wow64Injectx64.h" #include <memory> #include <string> #include <Windows.h> #include "wow64ext.h" #ifdef _DEBUG #define new DEBUG_NEW #endif #pragma comment(lib,"wow64ext.lib") // 唯一的应用程序对象 CWinApp theApp; using namespace std; typedef struct _UNICODE_STRING { USHORT Length; //UNICODE占用的内存字节数，个数*2； USHORT MaximumLength; DWORD64 Buffer; //注意这里指针的问题 } UNICODE_STRING ,*PUNICODE_STRING; unsigned char shell_code[] = { 0x48, 0x89, 0x4c, 0x24, 0x08, // mov qword ptr [rsp+8],rcx 0x57, // push rdi 0x48, 0x83, 0xec, 0x20, // sub rsp,20h 0x48, 0x8b, 0xfc, // mov rdi,rsp 0xb9, 0x08, 0x00, 0x00, 0x00, // mov ecx,8 0xb8, 0xcc, 0xcc, 0xcc, 0xcc, // mov eac,0CCCCCCCCh 0xf3, 0xab, // rep stos dword ptr [rdi] 0x48, 0x8b, 0x4c, 0x24, 0x30, // mov rcx,qword ptr [__formal] 0x49, 0xb9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov r9,0 //PVOID* BaseAddr opt 0x49, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov r8,0 //PUNICODE_STRING Name 0x48, 0xba, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov rdx,0 0x48, 0xb9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov rcx,0 0x48, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov rax,0 0xff, 0xd0, // call rax LdrLoadDll 0x48, 0xb9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov rcx,0 0x48, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // mov rax,0 0xff, 0xd0 // call rax }; enum InjectResult{ OK, Error_NoSuchFile, Error_OpenProcess, Error_VirtualAllocEx, Error_GetProcAddress, Error_WriteProcessMemory, Error_CreateRemoteThread }; InjectResult Wow64Injectx64(DWORD processid,const TCHAR* file_path); int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) { cout<<"查看要注入进程的ID"<<endl; ULONG_PTR ProcessID = 0; printf("Input ProcessID\r\n"); cin>>ProcessID; WCHAR file_path[] = L"E:\\Messagebox.dll"; if (OK==Wow64Injectx64(ProcessID,file_path)) { printf("Inject Success!\n"); } return 0; } InjectResult Wow64Injectx64(DWORD processid,const TCHAR* file_path) { if (!PathFileExists(file_path)) { return Error_NoSuchFile; } HANDLE handle = OpenProcess(PROCESS_ALL_ACCESS,FALSE,processid); if (INVALID_HANDLE_VALUE == handle) { return Error_OpenProcess; } size_t file_path_mem_length = (size_t)::_tcslen(file_path); size_t paramemter_size = (file_path_mem_length+1)*sizeof(TCHAR) + sizeof(UNICODE_STRING) + sizeof(DWORD64); DWORD64 paramemter_mem_addr = (DWORD64)VirtualAllocEx64(handle,NULL,paramemter_size,MEM_COMMIT,PAGE_READWRITE); DWORD64 shell_code_addr = (DWORD64)VirtualAllocEx64(handle,NULL,sizeof(shell_code),MEM_COMMIT,PAGE_EXECUTE_READWRITE); if ((!paramemter_mem_addr) || (!shell_code_addr)) { return Error_VirtualAllocEx; } char * paramemter_mem_local = new char[paramemter_size]; memset(paramemter_mem_local,0,paramemter_size); PUNICODE_STRING ptr_unicode_string = (PUNICODE_STRING)(paramemter_mem_local + sizeof(DWORD64)); ptr_unicode_string->Length = file_path_mem_length; ptr_unicode_string->MaximumLength = file_path_mem_length*2; wcscpy((WCHAR*)(ptr_unicode_string+1),file_path); ptr_unicode_string->Buffer = (DWORD64)((char*)paramemter_mem_addr+sizeof(DWORD64)+sizeof(UNICODE_STRING)); DWORD64 ntdll64 = GetModuleHandle64(L"ntdll.dll"); DWORD64 ntdll_LdrLoadDll = GetProcAddress64(ntdll64,"LdrLoadDll"); DWORD64 ntdll_RtlCreateUserThread = GetProcAddress64(ntdll64,"RtlCreateUserThread"); DWORD64 ntdll_RtlExitThread = GetProcAddress64(ntdll64,"RtlExitUserThread"); if (NULL == ntdll_LdrLoadDll || NULL==ntdll_RtlCreateUserThread || NULL==ntdll_RtlExitThread) { return Error_GetProcAddress; } //r9 memcpy(shell_code+32,¶memter_mem_addr,sizeof(DWORD64)); //r8 DWORD64 ptr = paramemter_mem_addr+sizeof(DWORD64); memcpy(shell_code+42,&ptr,sizeof(PUNICODE_STRING)); //LdrLoaddll memcpy(shell_code+72,&ntdll_LdrLoadDll,sizeof(DWORD64)); //RtlExitUserThread memcpy(shell_code+94,&ntdll_RtlExitThread,sizeof(DWORD64)); size_t write_size = 0; if (!WriteProcessMemory64(handle,paramemter_mem_addr,paramemter_mem_local,paramemter_size,NULL) || !WriteProcessMemory64(handle,shell_code_addr,shell_code,sizeof(shell_code),NULL)) { return Error_WriteProcessMemory; } DWORD64 hRemoteThread = 0; struct { DWORD64 UniqueProcess; DWORD64 UniqueThread; } client_id; int a = X64Call(ntdll_RtlCreateUserThread,10, (DWORD64)handle, // ProcessHandle (DWORD64)NULL, // SecurityDescriptor (DWORD64)FALSE, // CreateSuspended (DWORD64)0, // StackZeroBits (DWORD64)NULL, // StackReserved (DWORD64)NULL, // StackCommit shell_code_addr, // StartAddress (DWORD64)NULL, // StartParameter (DWORD64)&hRemoteThread, // ThreadHandle (DWORD64)&client_id); // ClientID) if (INVALID_HANDLE_VALUE == (HANDLE)hRemoteThread) { return Error_CreateRemoteThread; } return OK; }
完整Demo地址：https://github.com/ChengChengCC/Ark-tools/tree/master/Wow64Injectx64
关于Windows x64的学习，《Windows Internals》（中文译版《深入解析Windows操作系统》，潘老师译的）不错。顺便吐槽下学校把那么多的好书都放在阅览室，只能看，不能借，好多全新的书上都是灰！
