ASM help

[Mr. X]

Hi,

I am just a newbie and trying to learn ASM language and i have just started with MSG box. I have just used the source code of MSG box for learning purpose to create a msg box. But on execution, i am continuously getting this error. If anyone can provide me any help over this then it would be great.

This is the pic of error which i am getting on execution.

Cheers,

Mr. X

[Mr. X]

Hi,

Problem solved. now its working fine. But want some info.

I have coded this small box

Now i want that if i should press yes it should go to some specific web page like

www.tuts4you.com

and if i will press no..it should go exit.

Any help ...Just a newbie. Want to become good cracker.

Here is my source:

386
.model flat, stdcall 
option casemap:none include windows.inc
include kernel32.inc  
include user32.inc
includelib kernel32.lib  
includelib user32.lib.data 
MsgBoxCaption  db "Simple MessageBox Program",0 
MsgBoxText	 db "Hello World!",0 .code 
start: 
invoke MessageBox, 0, addr MsgBoxText, addr MsgBoxCaption, MB_YESNO + MB_ICONASTERISK + MB_DEFBUTTON2
invoke ExitProcess,0
end start

Cheers

Edited June 28, 2009 by Mr. X

[enhzflep]

Now i want that if i should press yes it should go to some specific web page like

www.tuts4you.com

and if i will press no..it should go exit.

Any help ...Just a newbie. Want to become good cracker.

Okay, so what you want to do is

• check the return value of MessageBox
  
• call ShellExecute if you get a return value of IDYES
  

Try this code on for size:

.386
	   .model flat, stdcall
	   option casemap:none	   include windows.inc
	   include kernel32.inc  
	   include user32.inc
	   include shell32.inc
	   includelib kernel32.lib  
	   includelib user32.lib
	   includelib shell32.lib
	   .data
	   MsgBoxCaption  db "Simple MessageBox Program",0
	   MsgBoxText	 db "Hello World!",0
	   shellCmd		db	"www.tuts4you.com", 0
	   openTxt		db	"open"	   .code
	   start:
		   invoke MessageBox, 0, addr MsgBoxText, addr MsgBoxCaption, MB_YESNO + MB_ICONASTERISK + MB_DEFBUTTON2
		   cmp	eax, IDYES
		   jne	endProg
		   invoke ShellExecute, 0, addr openTxt, addr shellCmd, 0, 0, SW_SHOWNORMAL	 
	   endProg:
		   invoke ExitProcess,0
	   end start

[Master Mind]

Hi,

I just want to execute this code in a vb application. So before adding this code to application, I just used lorepe and added the import dll shell32 and i used the api shell32.ShellExecuteA. After doing this i saved the changes in lord pe. Now just for a test i run the application to confirm this thing that its working or not ...so that i can insert my code after that But i got this error.

Any idea why this thing happen and how to deal with it. So that application should run fine and i should be able to inject my code in it.

Thanks

Edited June 28, 2009 by Master Mind

[ghandi]

Looking at your error message, are you using the string: "shell32.ShellExecuteA" ?

If so, try removing the "shell32." from the start, so it reads simply "ShellExecuteA".

I didnt know that this kind of patching would work on VB executables too.

HR,

Ghandi

[ala_borbe]

or use WinExec, it needs less parameters

http://msdn.microsoft.com/en-us/library/ms687393%28VS.85%29.aspx