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第二次课，文件校验（预习）

news 文章来源：https://blog.csdn.net/m0_72827793/article/details/133827708 2024/9/28 0:19:55

hash 计算接口 Crypto API （证书，对称加密，非对称加密，编码和解码）
CryptAcquireContext
CryptCreateHash
CryptReleaseContext
CryptHashData
CryptDestroyHash
CryptGetHashParam

注册表操作接口
RegEnumKeyEx
RegEnumValueW
RegOpenKeyExW
RegQueryValueExW
RegQueryInfoKeyW

服务注册表的路径：\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services

AutoRuns 和 AutoRuncs 下载地址
https://learn.microsoft.com/zh-cn/sysinternals/downloads/autoruns

目标：
1、在上次课的基础上把所有枚举出来的进程以及进程模块的文件hash值[MD5 sha-1,sha256]计算出来；存在父进程id的进程一并把父进程信息给关联起来一并输出；涉及运行中文件的打开，可以考虑先复制到其他地方再读取内容进行计算。
2、使用注册表接口，把注册表中的服务信息枚举出来，并输出关联的二进制路径，思考一下使用服务接口枚举的服务和注册表枚举的服务如何关联。
3、使用注册表接口，枚举当前计算启动项信息，启动项注册表路径自己查阅资料。
扩展内容：可以在进程，模块hash的基础上增加文件签名校验：参考内容链接：https://blog.csdn.net/StanfordZhang/article/details/8255605

1、hash CRC32–开销比较小，MD5，SHA1,SHA256 --运行开销，自定义的简单hash ，oxxxdxg.exe 长度，第一个字符是0 第四个字符是d 第六个是g 存在碰撞的可能。FFFFXAC VALUE ^ KEY = ENCODE;ENCODE ^ KEY = VALUE;

1231234535–》calc_proc—>data_spect

运行时解密。

框架原始的串 --》calc——proc -》FFFFXAC ollydbg.exe

注册表，这个就是WINDOWS 自带的数据库，或者说是一个配置库。

自启动

总结：白名单技术。云查（网络接口）

先给三个代码

1、在上次课的基础上把所有枚举出来的进程以及进程模块的文件hash值
[MD5 sha-1,sha256]计算出来；存在父进程id的进程一并把父进程信息给关联起来一并输出；
涉及运行中文件的打开，可以考虑先复制到其他地方再读取内容进行计算。
//第一部分计算#include <stdio.h>
#include <windows.h>
#include <tlhelp32.h>
#include <wincrypt.h>
#include <iostream>
#include <string>
#include<TlHelp32.h>
#include<psapi.h>
#include <vector>// 计算文件的哈希值
std::string CalculateHash(const wchar_t* filePath, const char* hashAlgorithm)
{std::string hashValue;HANDLE hFile = CreateFile(filePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);if (hFile != INVALID_HANDLE_VALUE){HCRYPTPROV hProv = NULL;HCRYPTHASH hHash = NULL;if (CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)){if (CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)){const DWORD bufferSize = 8192;BYTE buffer[bufferSize];DWORD bytesRead;while (ReadFile(hFile, buffer, bufferSize, &bytesRead, NULL) && bytesRead > 0){CryptHashData(hHash, buffer, bytesRead, 0);}DWORD cbHashSize = 0;DWORD hashSize = sizeof(DWORD);if (CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)&cbHashSize, &hashSize, 0)){std::vector<BYTE> hashBuffer(cbHashSize);if (CryptGetHashParam(hHash, HP_HASHVAL, &hashBuffer[0], &cbHashSize, 0)){char hexChar[] = "0123456789ABCDEF";hashValue.reserve(2 * cbHashSize);for (DWORD i = 0; i < cbHashSize; ++i){hashValue.push_back(hexChar[hashBuffer[i] >> 4]);hashValue.push_back(hexChar[hashBuffer[i] & 0xF]);}}}CryptDestroyHash(hHash);}CryptReleaseContext(hProv, 0);}CloseHandle(hFile);}return hashValue;
}int main()
{HANDLE hProcessSnap;PROCESSENTRY32 pe32;// 获取进程快照hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);if (hProcessSnap == INVALID_HANDLE_VALUE){printf("创建进程快照失败！错误码：%d\n", GetLastError());return 1;}// 设置进程快照结构体大小pe32.dwSize = sizeof(PROCESSENTRY32);// 获取第一个进程的信息if (!Process32First(hProcessSnap, &pe32)){printf("获取第一个进程信息失败！错误码：%d\n", GetLastError());CloseHandle(hProcessSnap);return 1;}// 遍历进程快照，输出每个进程内的System32路径下的模块do{HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pe32.th32ProcessID);if (hProcess){HMODULE hMods[1024];DWORD cbNeeded;// 获取模块句柄数组if (EnumProcessModules(hProcess, hMods, sizeof(hMods), &cbNeeded)){// 获取模块路径for (unsigned int i = 0; i < cbNeeded / sizeof(HMODULE); i++){wchar_t szModuleName[MAX_PATH];if (GetModuleFileNameEx(hProcess, hMods[i], szModuleName, MAX_PATH)){// 判断模块路径是否位于System32目录下if (wcsstr(szModuleName, L"\\System32\\") != NULL){std::string md5Hash = CalculateHash(szModuleName, "MD5");std::string sha1Hash = CalculateHash(szModuleName, "SHA1");std::string sha256Hash = CalculateHash(szModuleName, "SHA256");printf("进程ID: %d\n", pe32.th32ProcessID);printf("父进程ID: %d\n", pe32.th32ParentProcessID);printf("模块路径: %ls\n", szModuleName);printf("MD5 哈希值: %s\n",(md5Hash.empty() ? "计算失败" : md5Hash.c_str()));printf("SHA1 哈希值: %s\n", (sha1Hash.empty() ? "计算失败" : sha1Hash.c_str()));printf("SHA256 哈希值: %s\n\n", (sha256Hash.empty() ? "计算失败" : sha256Hash.c_str()));}}}}CloseHandle(hProcess);}} while (Process32Next(hProcessSnap, &pe32));CloseHandle(hProcessSnap);return 0;
}//使用注册表接口，把注册表中的服务信息枚举出来，并输出关联的二进制路径
#include <windows.h>
#include <iostream>
#include <string>void EnumerateServices()
{HKEY hKey;if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Services", 0, KEY_READ, &hKey) == ERROR_SUCCESS){DWORD numSubKeys;if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &numSubKeys, NULL, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){for (DWORD i = 0; i < numSubKeys; i++){WCHAR serviceName[MAX_PATH];DWORD serviceNameSize = MAX_PATH;if (RegEnumKeyExW(hKey, i, serviceName, &serviceNameSize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){HKEY hServiceKey;if (RegOpenKeyExW(hKey, serviceName, 0, KEY_READ | KEY_WOW64_64KEY, &hServiceKey) == ERROR_SUCCESS){WCHAR imagePath[MAX_PATH];DWORD imagePathSize = MAX_PATH;if (RegQueryValueExW(hServiceKey, L"ImagePath", NULL, NULL, reinterpret_cast<LPBYTE>(imagePath), &imagePathSize) == ERROR_SUCCESS){std::wcout << "Service Name: " << serviceName << std::endl;std::wcout << "Binary Path: " << imagePath << std::endl;std::wcout << std::endl;}RegCloseKey(hServiceKey);}}}}RegCloseKey(hKey);}
}int main()
{EnumerateServices();return 0;
}

2、使用注册表接口，把注册表中的服务信息枚举出来，并输出关联的二进制路径，思考一下使用服务接口枚举的服务和注册表枚举的服务如何关联
#include <windows.h>
#include <iostream>
#include <string>void EnumerateServices()
{HKEY hKey;if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Services", 0, KEY_READ, &hKey) == ERROR_SUCCESS){DWORD numSubKeys;if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &numSubKeys, NULL, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){for (DWORD i = 0; i < numSubKeys; i++){WCHAR serviceName[MAX_PATH];DWORD serviceNameSize = MAX_PATH;if (RegEnumKeyExW(hKey, i, serviceName, &serviceNameSize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){HKEY hServiceKey;if (RegOpenKeyExW(hKey, serviceName, 0, KEY_READ | KEY_WOW64_64KEY, &hServiceKey) == ERROR_SUCCESS){WCHAR imagePath[MAX_PATH];DWORD imagePathSize = MAX_PATH;if (RegQueryValueExW(hServiceKey, L"ImagePath", NULL, NULL, reinterpret_cast<LPBYTE>(imagePath), &imagePathSize) == ERROR_SUCCESS){std::wcout << "Service Name: " << serviceName << std::endl;std::wcout << "Binary Path: " << imagePath << std::endl;std::wcout << std::endl;}RegCloseKey(hServiceKey);}}}}RegCloseKey(hKey);}
}int main()
{EnumerateServices();return 0;
}

3、使用注册表接口，枚举当前计算启动项信息
#include <windows.h>
#include <iostream>
#include <string>void EnumerateStartupItems()
{HKEY hKey;// 枚举HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run键的值if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_READ, &hKey) == ERROR_SUCCESS){DWORD numValues;if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, NULL, NULL, NULL, &numValues, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){for (DWORD i = 0; i < numValues; i++){WCHAR valueName[MAX_PATH];DWORD valueNameSize = MAX_PATH;BYTE data[MAX_PATH];DWORD dataSize = MAX_PATH;DWORD valueType;if (RegEnumValueW(hKey, i, valueName, &valueNameSize, NULL, &valueType, data, &dataSize) == ERROR_SUCCESS){if (valueType == REG_SZ){std::wcout << "Value Name: " << valueName << std::endl;std::wcout << "Binary Path: " << reinterpret_cast<WCHAR*>(data) << std::endl;std::wcout << std::endl;}}}}RegCloseKey(hKey);}// 枚举HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run键的值if (RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_READ, &hKey) == ERROR_SUCCESS){DWORD numValues;if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, NULL, NULL, NULL, &numValues, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){for (DWORD i = 0; i < numValues; i++){WCHAR valueName[MAX_PATH];DWORD valueNameSize = MAX_PATH;BYTE data[MAX_PATH];DWORD dataSize = MAX_PATH;DWORD valueType;if (RegEnumValueW(hKey, i, valueName, &valueNameSize, NULL, &valueType, data, &dataSize) == ERROR_SUCCESS){if (valueType == REG_SZ){std::wcout << "Value Name: " << valueName << std::endl;std::wcout << "Binary Path: " << reinterpret_cast<WCHAR*>(data) << std::endl;std::wcout << std::endl;}}}}RegCloseKey(hKey);}
}int main()
{EnumerateStartupItems();return 0;
}

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