(声明：魏滔序原创，转贴请注明出处。)
所谓DLL远程注入，就是强迫DLL程序运行在其他进程中，这样做的目的无非有两种：第一是伪装自身，第二是控制宿主。前者常见于病毒或木马，后者则一般用于正规之场合，比如常见的输入法、外挂等等，有时Hook(钩子)也用到该技术。由此可见，技术是把双刃剑，区别在于使用技术的人。 DLL远程注入的方法一般有如下几种：
1.修改注册表，系统启动时自动加载。当然，如果卸载就要关闭系统了，或者使用本文的卸载功能。
2.使用SetWindowsHookEx进行注入，该参数最后一个参数值决定注入的全局与否。
3.BHO，这个没什么可说的，仅局限与浏览器。
4.使用CreateRemoteThread进行注入，也就是本文的主要内容。 注入过程大致是：
1.打开目标进程。
2.在目标进程中申请一块内存，用来存放要注入的dll名称。
3.将dll名称写入该内存。
4.获得LoadLibraryA函数的地址，该函数在任何进程中的地址都相同。
5.创建远程线程，也就是执行LoadLibraryA函数了。当然LoadLibraryA的参数就是上面保存的dll名称。
6.等待线程返回
到此为止，dll已经被成功在远程进程中运行了，至于运行后该如何工作，那就发挥你无穷的想像力吧。卸载过程与注入过程雷同，只是区别于后面使用了FreeLibrary函数进行卸载。注意，FreeLibrary函数只能传入模块的句柄，可使用GetModuleHandleA函数获得。 源码奉上：
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; Win32汇编实现DLL的远程注入及卸载
; Programmed by 魏滔序
; WebSite: http://www.chenoe.com
; Blog: http://blog.csdn.net/Modest
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.486 ; create 32 bit code
.model flat, stdcall ; 32 bit memory model
option casemap :none ; case sensitive
include windows.inc
include kernel32.inc
includelib kernel32.lib
RemoteInjectModule PROTO :DWORD,:DWORD
RemoteUnloadModule PROTO :DWORD,:DWORD
.data
szKernel32 db 'Kernel32',0
szGetModuleHandleA db 'GetModuleHandleA',0
szLoadLibraryA db 'LoadLibraryA',0
szFreeLibrary db 'FreeLibrary',0
.code Start:
RemoteInjectModule proc dwProcID,pszModule
LOCAL hProcess, hThread, dwExitCode
LOCAL pszBuffer,pdwAddress
Invoke OpenProcess,PROCESS_QUERY_INFORMATION Or PROCESS_CREATE_THREAD Or PROCESS_VM_OPERATION Or PROCESS_VM_WRITE, 0, dwProcID
MOV hProcess,EAX
.If hProcess == 0
JMP ErrHandle
.Endif
Invoke VirtualAllocEx,hProcess, 0, MAX_PATH, MEM_COMMIT, PAGE_READWRITE
MOV pszBuffer,EAX
.If pszBuffer == 0
JMP ErrHandle
.Endif
Invoke WriteProcessMemory,hProcess, pszBuffer, pszModule, MAX_PATH, 0
.If EAX == 0
JMP ErrHandle
.Endif
Invoke GetModuleHandle,addr szKernel32
Invoke GetProcAddress,EAX, addr szLoadLibraryA
MOV pdwAddress,EAX
.If pdwAddress == 0
JMP ErrHandle
.Endif
Invoke CreateRemoteThread,hProcess, 0,0, pdwAddress, pszBuffer, 0, 0
MOV hThread,EAX
.If hThread == 0
JMP ErrHandle
.Endif
Invoke WaitForSingleObject,hThread, INFINITE
Invoke GetExitCodeThread,hThread,addr dwExitCode
.If dwExitCode != 0
Invoke VirtualFreeEx, hProcess, pszBuffer, 0, MEM_RELEASE
Invoke CloseHandle,hProcess
MOV EAX,1
.else
MOV EAX,0
.endif
RET
ErrHandle:
.If pszBuffer != 0
Invoke VirtualFreeEx, hProcess, pszBuffer, 0, MEM_RELEASE
.Endif
.If hThread != 0
Invoke CloseHandle, hThread
.Endif
.If hProcess != 0
Invoke CloseHandle,hProcess
.Endif
MOV EAX,0
RET
RemoteInjectModule endp
RemoteUnloadModule proc dwProcID,pszModule
LOCAL hProcess, hThread, dwExitCode
LOCAL pszBuffer,pdwAddress
Invoke OpenProcess,PROCESS_QUERY_INFORMATION Or PROCESS_CREATE_THREAD Or PROCESS_VM_OPERATION Or PROCESS_VM_WRITE, 0, dwProcID
MOV hProcess,EAX
.If hProcess == 0
JMP ErrHandle
.Endif
Invoke VirtualAllocEx,hProcess, 0, MAX_PATH, MEM_COMMIT, PAGE_READWRITE
MOV pszBuffer,EAX
.If pszBuffer == 0
JMP ErrHandle
.Endif
Invoke WriteProcessMemory,hProcess, pszBuffer, pszModule, MAX_PATH, 0
.If EAX==0
JMP ErrHandle
.Endif
Invoke GetModuleHandle,addr szKernel32
Invoke GetProcAddress,EAX, addr szGetModuleHandleA
MOV pdwAddress,EAX
.If pdwAddress == 0
JMP ErrHandle
.Endif
Invoke CreateRemoteThread,hProcess, 0, 0, pdwAddress, pszBuffer, 0,0
MOV hThread,EAX
.If hThread == 0
JMP ErrHandle
.Endif
Invoke WaitForSingleObject,hThread, INFINITE
Invoke GetExitCodeThread, hThread, addr dwExitCode
Invoke VirtualFreeEx, hProcess, pszBuffer, 0, MEM_RELEASE
Invoke CloseHandle, hThread
Invoke GetModuleHandle,addr szKernel32
Invoke GetProcAddress,EAX, addr szFreeLibrary
MOV pdwAddress,EAX
.If pdwAddress == 0
JMP ErrHandle
.Endif
Invoke CreateRemoteThread,hProcess, 0, 0, pdwAddress, dwExitCode, 0,0
MOV hThread,EAX
.If hThread == 0
JMP ErrHandle
.Endif
Invoke WaitForSingleObject,hThread, INFINITE
Invoke GetExitCodeThread, hThread, addr dwExitCode
.If dwExitCode != 0
Invoke VirtualFreeEx, hProcess, pszBuffer, 0, MEM_RELEASE
Invoke CloseHandle,hProcess
MOV EAX,1
.else
MOV EAX,0
.endif
RET
ErrHandle:
.If pszBuffer != 0
Invoke VirtualFreeEx, hProcess, pszBuffer, 0, MEM_RELEASE
.Endif
.If hThread != 0
Invoke CloseHandle, hThread
.Endif
.If hProcess != 0
Invoke CloseHandle,hProcess
.Endif
MOV EAX,0
RET
RemoteUnloadModule endp End Start
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