- 1 year ago
Create suspended process and rewrite its memory space before resuming
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Creating a suspended process and rewriting its memory space before resuming it can be achieved using Windows API functions. Here's a step-by-step approach in C++:
- Include the necessary headers:
cpp#include <windows.h>
#include <tlhelp32.h>
- Create a function to inject code into the target process. In this example, we'll use a simple function to display a message box, but you can replace it with your own code.
cppvoid InjectCode(DWORD pid)
{
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
if (hProcess)
{
// Calculate the address where the code will be injected
LPVOID remoteAddr = VirtualAllocEx(hProcess, NULL, 4096, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (remoteAddr)
{
// The code to display a message box in the target process
BYTE code[] = {
0x68, 0, 0, 0, 0, // push 0 (style)
0x68, 0, 0, 0, 0, // push 0 (caption)
0x68, 0, 0, 0, 0, // push 0 (text)
0x6A, 0x00, // push 0 (type)
0xB8, 0, 0, 0, 0, // mov eax, MessageBoxA address
0xFF, 0xD0, // call eax
0xC3 // ret
};
DWORD MessageBoxAAddr = (DWORD)GetProcAddress(GetModuleHandle("user32.dll"), "MessageBoxA");
*(DWORD*)(code + 1) = (DWORD)remoteAddr + 20; // address of text (after the code)
*(DWORD*)(code + 6) = (DWORD)remoteAddr + 24; // address of caption
*(DWORD*)(code + 11) = (DWORD)remoteAddr + 28; // address of style
*(DWORD*)(code + 16) = (DWORD)MessageBoxAAddr; // MessageBoxA address
// Write the code to the target process
SIZE_T bytesWritten;
WriteProcessMemory(hProcess, remoteAddr, code, sizeof(code), &bytesWritten);
// Create a thread to execute the injected code
HANDLE hThread = CreateRemoteThread(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)remoteAddr, NULL, 0, NULL);
if (hThread)
{
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);
}
// Clean up
VirtualFreeEx(hProcess, remoteAddr, 0, MEM_RELEASE);
}
CloseHandle(hProcess);
}
}
- Find the target process ID. You can use various methods, such as enumerating running processes or searching for a specific process name.
cppDWORD GetProcessID(const char* processName)
{
DWORD pid = 0;
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnapshot != INVALID_HANDLE_VALUE)
{
PROCESSENTRY32 pe;
pe.dwSize = sizeof(PROCESSENTRY32);
if (Process32First(hSnapshot, &pe))
{
do
{
if (_stricmp(pe.szExeFile, processName) == 0)
{
pid = pe.th32ProcessID;
break;
}
} while (Process32Next(hSnapshot, &pe));
}
CloseHandle(hSnapshot);
}
return pid;
}
- Main function to demonstrate the process:
cppint main()
{
const char* targetProcessName = "target.exe";
DWORD targetPID = GetProcessID(targetProcessName);
if (targetPID != 0)
{
InjectCode(targetPID);
}
else
{
printf("Target process '%s' not found.\n", targetProcessName);
}
return 0;
}
Keep in mind that manipulating the memory of other processes can be a delicate task and may lead to unexpected behavior or crashes. Be careful when working with other processes, and ensure you have the necessary permissions to modify them.