VirtualQueryEx failing with access denied

[Savail]

Hey all,
I'm using Windows 8 64 bit. I know C++ and basics of assembly. My goal is to get dumped .exe of a game from its process's memory. So, I wrote a program which is able to successfuly read memory from most of processes using VirtualQueryEx. However, I've come across a process for which this function fails. It's not a system process, just a game process. Without Debug privileges I couldn't even open the process's handle(OpenProcess). With them I am able to get the process's handle but still get access denied for VirtualQueryEx.

Why is that happening? Does anybody know what did they do to deny access to memory for other applications even with debug privileges set?

Now, I've already done a lot of research and wonder which approach should I follow in order to reach my goal. Is that possible that I can read this process's memory only in kernel mode? It seems to be a lot of work and in kernel mode there is no functions such as VirtualQueryEx etc...
I've read also that VirtualQueryEx might be hooked or sth? If that's the case what could I do to unhook this?
Or maybe, simple DLL injection could work? Provided that DLL can be attached without access denied... Then inside my DLL I would be within Virtual address space for the game's process and getting it's binary shouldn't be a probem then. I haven't tried it yet though.

I hope some professional could answer my questions and point me to the right direction! I would be really grateful for any help in this matter!

[DarkLinux]

Do you have privileges? Aka are you running it as Admin?

[Savail]

yeah, I'm running my program even with debug privileges enabled but it seems it's not enough for some processes. I now wonder what else could I do to get access to such hard accessible processes' memory

[Savail]

DLL Injection method also doesn't work. This time VirtualAllocEx function fails with access denied. (Error 5) T_T

[DarkLinux]

HANDLE WINAPI OpenProcess(
  _In_  DWORD dwDesiredAccess,
  _In_  BOOL bInheritHandle,
  _In_  DWORD dwProcessId
);

What are you setting dwDesiredAccess as?

http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

[Savail]

PROCESS_ALL_ACCESS of course :P. The process I'm trying to access is very specific anyway so I'm not sure wether any Windows API can help me . I probably have to delve into kernel T_T