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Code Injection MessageBox Hook

 
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rovnix
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Joined: 09 Feb 2014
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PostPosted: Thu Feb 18, 2016 7:02 am    Post subject: Code Injection MessageBox Hook Reply with quote
Alright Hi,

I need a snippet for MessageBox() Hook using Code injection Pls. Can someone be of help, i'd appreciate it .
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ParkourPenguin
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Joined: 06 Jul 2014
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PostPosted: Thu Feb 18, 2016 11:58 am    Post subject: Reply with quote
  1. Find that function's location in memory (ultimap might be useful)
  2. Make a jmp to your code near the beginning of that function
  3. Write your code with either a "ret" instruction at the end or a jmp back to the code if you still want the function to run
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mgostIH
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Joined: 01 Jan 2016
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PostPosted: Thu Feb 18, 2016 12:50 pm    Post subject: Reply with quote
ParkourPenguin wrote:
  1. Find that function's location in memory (ultimap might be useful)
  2. Make a jmp to your code near the beginning of that function
  3. Write your code with either a "ret" instruction at the end or a jmp back to the code if you still want the function to run


Ultimap for a MessageBox hook is not needed and a lot of people can't use it, so it's not a tip for everyone.

If the MessageBox function is a game related one, then you can find it easily using OllyDBG or even Cheat Engine "Find referenced strings" function (yes, it has one aswell) and searching for the text used by the messagebox.

If it's the windows default one, you can find it on cheat engine easily, just go to the memory viewer code section , Right Click->Goto Address and write:
Code:
user32.MessageBoxA


There you have the address. For the hook, Windows default messagebox uses 4 parameters, so a "ret 10" is needed at the end of your hook, if you don't clean up the stack already in your code (which you shouldn't actually).


Simple Code Snippet for Windows MessageBoxA hook:
Code:
alloc(newmem,2048)


newmem: //this is allocated memory, you have read,write,execute access
mov eax,0  //Hook code
ret 10
MessageBoxA:
jmp newmem


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