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| 关键词： nbsp Invoke hProcess hThread Endif pszBuffer ErrHandle pdwAddress EAX dwExitCode |
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： ;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ; 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 ;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: .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 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 RETRemoteInjectModule 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 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 RETRemoteUnloadModule endpEnd Start |
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