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Lucy Berie



Joined: 08 Dec 2012
Posts: 13
Lucy Berie
Hi!

From the invoke macro, I've sucessfully implemented 'terminating a process' by assembly code. Here is my code :
Code:
;explorer.exe
PID = 1528
...................................
invoke TerminateProcess, invoke OpenProcess, 1, 0, PID, 0
    

Now, I want to get the process Id via a function. I want to translate :
Code:
int ProcessId()
{
return 1352;
}
.................................
invoke TerminateProcess, invoke OpenProcess, 1, 0, call ProcessId...
    

To assembly code...
Thanks you. Very Happy


Last edited by Lucy Berie on 09 Dec 2012, 13:17; edited 1 time in total
Post 09 Dec 2012, 13:10
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17474
Location: In your JS exploiting you and your system
revolution
You can also use the simpler:
Code:
invoke ExitProcess,0    


Edit: Perhaps I misunderstood what you want.

You would usually use stdcall or ccall instead of invoke for internal function calls.
Post 09 Dec 2012, 13:17
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Lucy Berie



Joined: 08 Dec 2012
Posts: 13
Lucy Berie
Thanks.
My question is : How to define a function?
Could you give me a function template example, which has an integer returning value (Like the simple C function example I mentioned above...)
Post 09 Dec 2012, 13:50
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ManOfSteel



Joined: 02 Feb 2005
Posts: 1154
ManOfSteel
C functions are nothing more than subroutines being called with their parameters pushed on the stack.

The proc macroinstruction provides a method to define procedures, e.g.:

Code:
mov eax,1234

; call "TestProc" procedure with a parameter of "1234"
stdcall TestProc,eax


[...]
[some more code]
[...]


; define "TestProc" procedure
proc TestProc Parameter
; define a local variable called "LOCAL_VAR"
local LOCAL_VAR:DWORD

; read the local variable
lea ebx,[LOCAL_VAR]

; write to the local variable
mov [LOCAL_VAR],0xABCD

; invoke a system API that uses the contents of "Parameter", i.e. "1234" in decimal
invoke SomeSystemAPI,[Parameter],ecx,0xDEADBEEF

ret
endp
    


Check the Windows programming headers for more information.
Post 09 Dec 2012, 15:14
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