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sylvanus · Posted: Sat Sep 13, 2008 12:22 pm Post subject: Question basis of __asm command

help please :

if i am patch this address : 00AAAAAA = nop

DWORD address = 0x00AAAAAA
*(BYTE*)address = 0x90

but, other method, in asm for example

this correct?

__asm {
cs:00AAAAAA NOP
}

??
i look a example in this forum with __asm patching memory, but can't found,

oib111 · Posted: Sat Sep 13, 2008 12:25 pm Post subject:

Haven't really touched ASM but wouldn't it be something like this?

sylvanus · Posted: Sat Sep 13, 2008 12:29 pm Post subject:

yes, thanks!!

oib111 · Posted: Sat Sep 13, 2008 12:30 pm Post subject:

No problem Razz

GMZorita · Posted: Sat Sep 13, 2008 12:36 pm Post subject:

oib111 · Posted: Sat Sep 13, 2008 12:38 pm Post subject:

I think it's the value that the address holds, not for what value you're trying to move into it. But then again, I'm not an ASM expert.

samuri25404 · Posted: Sat Sep 13, 2008 12:45 pm Post subject:

The xxx represents the size of the value moving.

MOV DWORD implies 4 bytes, therefore, you would be moving

GMZorita · Posted: Sat Sep 13, 2008 1:02 pm Post subject:

sponge · Posted: Sat Sep 13, 2008 1:11 pm Post subject:

defining it as a dword would fill it up with crap + nop.

oib111 · Posted: Sat Sep 13, 2008 5:36 pm Post subject:

I have a question. Do you need to put the DS: part? Can't you just put this?

sylvanus · Posted: Sat Sep 13, 2008 8:37 pm Post subject:

yes oib,

i have other question,

I suppose this is also correct

_asm {
mov OWORD PTR:[0x00AAAAAA], 0x90909090909090909090909090909090
}

oword = 8 words

and DS = DATA SEGMENT not it neccesary?

lurc · Posted: Sat Sep 13, 2008 9:12 pm Post subject:

there's no colon when you don't use a segment register.

__asm mov dword ptr [0x123456], 0x90909090
__asm mov byte ptr [0x123456], 0x90

__asm mov dword ptr ds:[0x123456], 0x90909090
__asm mov byte ptr ds:[0x123456], 0x90

Zand · Posted: Sat Sep 13, 2008 9:39 pm Post subject:

OWORD?

I kinda recall there was a QWORD, but not OWORD...

GMZorita · Posted: Sun Sep 14, 2008 6:21 am Post subject:

Wintermoot · Posted: Sun Sep 14, 2008 7:04 am Post subject:

When you use 0x for this, you have to reverse the bytes...

Lets say jmp 00112233 is 75 77 and, jne 00112233 is 74 77. We want to change the jmp to jne.
That would mean you could do:
__asm mov word ptr ds:[0x00112233], 0x7774

OR

__asm mov word ptr ds:[0x00112233], 7477h

Someone please correct me if I am wrong...

Fixed typo...