Read Process Memory Multi Level Pointer (DLL Injection) - c++

Question

I've successfully injected a .dll into an .exe and need to access a value through multi level pointers.
This is a working example that's getting the correct value:
#include <Windows.h>
#include <iostream>
#include <vector>
#include <TlHelp32.h>
#include <tchar.h>
using namespace std;
DWORD dwGetModuleBaseAddress(TCHAR *lpszModuleName, DWORD pID)
{
DWORD dwBaseAddress = 0;
HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pID);
MODULEENTRY32 moduleEntry32 = { 0 };
moduleEntry32.dwSize = sizeof(MODULEENTRY32);
if (Module32First(hSnapshot, &moduleEntry32))
{
do {
if (_tcscmp(moduleEntry32.szModule, lpszModuleName) == 0)
{
dwBaseAddress = (DWORD)moduleEntry32.modBaseAddr;
break;
}
} while (Module32Next(hSnapshot, &moduleEntry32));
}
CloseHandle(hSnapshot);
return dwBaseAddress;
}
int main()
{
DWORD pID;
DWORD off1, off2, off3, off4, off5;
DWORD baseAddress;
DWORD xAddress;
int newX;
int currentX;
char moduleName[] = "TibiaInjected2.exe";
HWND hGameWindow;
HANDLE pHandle;
// Getting handles
hGameWindow = FindWindowA(NULL, "Tibia - 127.0.0.1:7171");
GetWindowThreadProcessId(hGameWindow, &pID);
pHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pID);
// Getting base address
DWORD clientBase = dwGetModuleBaseAddress(_T(moduleName), pID);
ReadProcessMemory(pHandle, (LPCVOID)(clientBase + 0x0031D0CC), &baseAddress, sizeof(baseAddress), NULL);
cout << "Base address: " << hex << baseAddress << endl;
ReadProcessMemory(pHandle, (LPCVOID)(baseAddress + 0x4), &off1, sizeof(off1), NULL);
cout << "Offset 1: " << hex << off1 << endl;
ReadProcessMemory(pHandle, (LPCVOID)(off1 + 0x4), &off2, sizeof(off2), NULL);
cout << "Offset 2: " << hex << off2 << endl;
ReadProcessMemory(pHandle, (LPCVOID)(off2 + 0xA0), &off3, sizeof(off3), NULL);
cout << "Offset 3: " << hex << off3 << endl;
ReadProcessMemory(pHandle, (LPCVOID)(off3 + 0x100), &off4, sizeof(off4), NULL);
cout << "Offset 4: " << hex << off4 << endl;
ReadProcessMemory(pHandle, (LPCVOID)(off4 + 0x14), &off5, sizeof(off5), NULL);
cout << "Offset 5: " << hex << off5 << endl;
cin.get();
}
I'd rather use my statically injected DLL and from what I've heard I can replace the whole dwGetModuleBaseAddress with GetModuleHandle(NULL) since it's from within the injected DLL. I also don't need to open any process. But if I don't do all that, what to replace the ReadProcessMemory with?
ReadProcessMemory(pHandle, (LPCVOID)(clientBase + 0x0031D0CC), &baseAddress, sizeof(baseAddress), NULL);
ReadProcessMemory(pHandle, (LPCVOID)(baseAddress + 0x4), &off1, sizeof(off1), NULL);
ReadProcessMemory(pHandle, (LPCVOID)(off1 + 0x4), &off2, sizeof(off2), NULL);
ReadProcessMemory(pHandle, (LPCVOID)(off2 + 0xA0), &off3, sizeof(off3), NULL);
ReadProcessMemory(pHandle, (LPCVOID)(off3 + 0x100), &off4, sizeof(off4), NULL);
ReadProcessMemory(pHandle, (LPCVOID)(off4 + 0x14), &off5, sizeof(off5), NULL);
I've managed to access value from static addresses directly by doing:
int* exampleValue = *(int*)0x12345678;
But can't figure out how to do the same with pointers and offset.

Answer 1

Yes you can use GetModuleHandle(NULL); to get the handle to the main .exe module or replace NULL with a string that matches the DLL name.
You can use this function that loops through the offsets, de-referencing and adding offsets at each level:
uintptr_t FindDMAAddy(uintptr_t ptr, std::vector<unsigned int> offsets)
{
uintptr_t addr = ptr;
for (unsigned int i = 0; i < offsets.size() ; ++i)
{
addr = *(uintptr_t*)addr;
addr += offsets[i];
}
return addr;
}
uintptr_t ammoAddr = FindDMAAddy(dynamicPtrBaseAddr, { 0x374, 0x14, 0x0 });
//or
int * ammoAddr = (int*)FindDMAAddy(dynamicPtrBaseAddr, { 0x374, 0x14, 0x0 });
You could also do some crazy thing like:
int * ammo = (int*)((*(uintptr_t*)((*(uintptr_t*)(dynamicPtrBaseAddr)) +0x374)) + 0x14);
But it's more confusing and annoying than it's worth.

Answer 2

This worked for me (could be put in a loop like the other answer did):
DWORD base = *(DWORD*)(clientBase + 0x0031D0CC);
DWORD offsets[] = { 0x4, 0x4, 0xA0, 0x100, 0x14 };
DWORD off1 = *(DWORD*)(base + offsets[0]);
DWORD off2 = *(DWORD*)(off1 + offsets[1]);
DWORD off3 = *(DWORD*)(off2 + offsets[2]);
DWORD off4 = *(DWORD*)(off3 + offsets[3]);
DWORD off5 = *(DWORD*)(off4 + offsets[4]);
cout << "Value: " << off5 << endl;