How to call WINAPI without use Invoke???

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jhonny6721

Joined: 07 Aug 2014
Posts: 26

jhonny6721 18 Aug 2014, 16:06

Hello, I need convert the following code:

Code:

invoke      FindFirstFile,file_extension, FIND_STRUCT

I need call the API using code like this:

Code:

;Push parameters for the function
    push file_extension     ;Put in the stack the address of FIND_STRUCT
    push FIND_STRUCT  ;File extension
    call FindFirstFile   ; find the first *.fly

I just need call the WinAPI using the call function, instead invoke Macro. Thanks for your answers

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Мне нравится программирование.

18 Aug 2014, 16:06

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20481
Location: In your JS exploiting you and your system

revolution 18 Aug 2014, 16:11

Parameters are pushed in reverse order. And the call target is indirect.

Code:

push FIND_STRUCT
push file_extension
call [FindFirstFile]

18 Aug 2014, 16:11

neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand

neville 19 Aug 2014, 01:50

jhonny6721 has admitted he is "researching" computer viruses.

Perhaps it can now be inferred that his research might be "delivered" via .fly email files.

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FAMOS - the first memory operating system

19 Aug 2014, 01:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20481
Location: In your JS exploiting you and your system

revolution 19 Aug 2014, 01:57

Must be a fishing program? Or perhaps an insect database? An airline booking system? Trouser zipper failure analysis?

19 Aug 2014, 01:57

alexfru

Joined: 23 Mar 2014
Posts: 80

alexfru 19 Aug 2014, 07:17

Invoke GetProcAddress() to obtain the address of FindFirstFile(). Then call it.
Other than that, you'd probably need to construct the .EXE manually or analyze it in memory (i.e. find the import table and the address of FindFirstFile() in it).

19 Aug 2014, 07:17

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20481
Location: In your JS exploiting you and your system

revolution 19 Aug 2014, 09:44

alexfru wrote:

Invoke GetProcAddress() to obtain the address of FindFirstFile(). Then call it.
Other than that, you'd probably need to construct the .EXE manually or analyze it in memory (i.e. find the import table and the address of FindFirstFile() in it).

I wonder if you are confusing the use of invoke (the Q the OP asked) with the existence of a binding in the import table?

19 Aug 2014, 09:44

DOS386

Joined: 08 Dec 2006
Posts: 1905

DOS386 19 Sep 2014, 08:49

> How to call WINAPI without use Invoke???

Lowest level: http://board.flatassembler.net/topic.php?t=11170

19 Sep 2014, 08:49

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