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VirtualallocEx C#

 
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GGKillLive
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PostPosted: Thu Mar 17, 2016 9:34 pm    Post subject: VirtualallocEx C# Reply with quote
Good evening , I apologize for my English , have a question , I can not create a memory closer to the instruction address as the CE, 0x7FFF00000000 address of the instruction , and the memory allocated to the example in 0x7FF000000000 because of that I can not make the right jmp , tell me what to do , or how to create the correct CE in memory in C # thanks in advance , sorry for the English, they speak a little
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Dark Byte
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PostPosted: Fri Mar 18, 2016 3:44 am    Post subject: Reply with quote
not sure about c# but virtualalloxex has a prefered base address.
but for it to function the address must be dividabke by 0x10000 (in short, the address gas to end with 0000 ) and no memory in that region must have been allocated or reserved.

also, don't onky use mem_commit, also use mem_reserve (combine them with a binary or instruction. usually | )
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GGKillLive
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PostPosted: Fri Mar 18, 2016 6:36 am    Post subject: Reply with quote
Dark Byte wrote:
not sure about c# but virtualalloxex has a prefered base address.
but for it to function the address must be dividabke by 0x10000 (in short, the address gas to end with 0000 ) and no memory in that region must have been allocated or reserved.

also, don't onky use mem_commit, also use mem_reserve (combine them with a binary or instruction. usually | )


Thank you very much , but that's not work ,for example I use this functionality,
VirtualAllocEx(HandleProc, IntPtr.Zero, (IntPtr)Size, 0x1000 + 0x100000, MemoryProtection.ExecuteReadWrite);

And it's further than 0x7ff000000000 my mobile phone , and you want to create in 0x7fff00000000

I would be very grateful if you show me an example , I just have 2 days trying to figure out how to be in C# with a selection in the desired location in memory and not dismantled.... MB I'm stupid
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hhhuut
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PostPosted: Fri Mar 18, 2016 7:15 am    Post subject: Reply with quote
I think on C++ for example your example would work, but I've heard (I don't program C# for myself, so you'll have to google if it's true) that in C#, the lpAddress parameter tries to allocate memory exactly at the address (not near it), so if you've chosen an invalid address (such as 0x00000000) or an address that's already taken (such as "Game.exe"+12345), the function fails.

Again, I'm not really sure about that ...
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GGKillLive
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PostPosted: Fri Mar 18, 2016 7:35 am    Post subject: Reply with quote
i.e. as I understand , specifically the implementation of the creation of memory in C# 0x7ff00000000 no more , for I don't know , then the trainer is easier to do in C++?
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hhhuut
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PostPosted: Fri Mar 18, 2016 7:44 am    Post subject: Reply with quote
Yes, I'd recommend C++ or Pascal rather than C# ...
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GGKillLive
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PostPosted: Fri Mar 18, 2016 7:53 am    Post subject: Reply with quote
Thanks bro , you can close the topic
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atom0s
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PostPosted: Fri Mar 18, 2016 1:09 pm    Post subject: Reply with quote
C# will work just fine doing this, there is no reason to switch languages.

VirtualAllocEx is setup like this:
Code:
LPVOID WINAPI VirtualAllocEx(
  _In_     HANDLE hProcess,
  _In_opt_ LPVOID lpAddress,
  _In_     SIZE_T dwSize,
  _In_     DWORD  flAllocationType,
  _In_     DWORD  flProtect
);


For creating memory to be used within a code cave, you normally just need to do something similar to:

(This is C++):
Code:
::VirtualAllocEx(handle, nullptr, 0x1000, MEM_COMMIT, PAGE_EXECUTE_READWRITE);


Your code looks fine as long as the DllImport you are using is correct. However, your memory access is a bit is wrong. You don't add two bits together. You need to OR them together like this:
0x1000 | 0x100000
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