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Index > Windows > [solved] undefined symbol GetSystemWow64Directory

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doutor



Joined: 29 Jan 2021
Posts: 2
doutor
When i add:
Code:
import kernel32,\
     GetSystemWow64Directory,'GetSystemWow64DirectoryA'
    

Compiler returns:
Quote:

Error: symbol already defined

and when this is removed i'm getting:
Quote:

undefined symbol GetSystemWow64Directory

How fix this?
Code:
format PE GUI 4.0

entry start 

include 'win32ax.inc'
include 'api\user32.inc'
include 'api\kernel32.inc'

section '.data' data readable writeable

a rb MAX_PATH  

section '.code' code readable executable

start:
      invoke GetSystemWow64Directory, a, MAX_PATH
      cmp eax, 0
      je exit
 
      invoke MessageBox, 0, a, '', MB_OK

exit:
      invoke ExitProcess, 0        
      
section '.idata' import data readable

 library kernel32,'kernel32.dll',\
      user32,'user32.dll'

import kernel32,\
     GetSystemWow64Directory,'GetSystemWow64DirectoryA'
    
Post 29 Jan 2021, 12:30
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 18609
Location: In your JS exploiting you and your system
revolution
If you add custom APIs to kernel32 then you can't use the default fasm libraries.

Something like this, where you manually construct the API tables, and remove the 'x' from win32a.inc:
Code:
format PE GUI 4.0

entry start

include 'win32a.inc'

section '.data' data readable writeable

a rb MAX_PATH

section '.code' code readable executable

start:
      invoke GetSystemWow64Directory, a, MAX_PATH
      cmp eax, 0
      je exit

      invoke MessageBox, 0, a, '', MB_OK

exit:
      invoke ExitProcess, 0

section '.idata' import data readable

 library kernel32,'kernel32.dll',\
      user32,'user32.dll'

import kernel32,\
     ExitProcess,'ExitProcess',\
     GetSystemWow64Directory,'GetSystemWow64DirectoryA'

import user32,\
     MessageBox,'MessageBoxA'    
Post 29 Jan 2021, 12:39
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doutor



Joined: 29 Jan 2021
Posts: 2
doutor
revolution wrote:
If you add custom APIs to kernel32 then you can't use the default fasm libraries.

Something like this, where you manually construct the API tables, and remove the 'x' from win32a.inc:
Code:
format PE GUI 4.0

entry start

include 'win32a.inc'

section '.data' data readable writeable

a rb MAX_PATH

section '.code' code readable executable

start:
      invoke GetSystemWow64Directory, a, MAX_PATH
      cmp eax, 0
      je exit

      invoke MessageBox, 0, a, '', MB_OK

exit:
      invoke ExitProcess, 0

section '.idata' import data readable

 library kernel32,'kernel32.dll',\
      user32,'user32.dll'

import kernel32,\
     ExitProcess,'ExitProcess',\
     GetSystemWow64Directory,'GetSystemWow64DirectoryA'

import user32,\
     MessageBox,'MessageBoxA'    


Thank you my friend. Solved! Very Happy
Post 29 Jan 2021, 13:15
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