Exetools  

Go Back   Exetools > General > General Discussion

Notices

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #5  
Old 12-08-2006, 19:00
dyn!o's Avatar
dyn!o dyn!o is offline
Friend
 
Join Date: Nov 2003
Location: Own mind
Posts: 214
Rept. Given: 1
Rept. Rcvd 1 Time in 1 Post
Thanks Given: 8
Thanks Rcvd at 0 Times in 0 Posts
dyn!o Reputation: 1
Quote:
So you say that if you have split the code into single instructions, decoded everything so far that each instruction can be placed at any memory location in any random order and know enough about the code to convert it into any code doing the same, it is more than one simple step to write a VM?
That is exactly what I say my friend

I would say more: IMHO that is not even a small step for vm development. It's still only a sample of pure code scrambler. Of course it will complicate reversing, especially when you take memory blocks checksum results as descrambling arguments/parameters or opcodes decryption. Complicate, but for whom? Approximately 95% crackers. There is still 5% left of them and they expect much harder protection.

IMHO VM has to operate in own environment (CPU, registers, stack, memory - including structure and communication). Sometimes virtual machines are misunderstand with virtualization but the topic we discuss is not close to virtualisation too (VMWare and VirtualPC are).

EDIT: Sorry, I did not notice your question "how vm works then". Well, each one of us can have own definition and imagination but if you want to take a look at vm inside protector then you can take Themida - it contains vm but it resembles x86 (I mean is not very hard to reverse). Question why is another topic, but you can answer it yourself looking at SPARC/PowerPC open source emulators available on the net.

Next kind of virtual machines are the ones residing in Atari/ZX/C64/Amiga emulators. They are often "perfect" virtual machines, able to serve as real virtual environment. If we are talking about vm in protections then definitely the best vm resides inside StarForce - it is already a legend. The rest is mystic...

Regards.

Last edited by dyn!o; 12-08-2006 at 19:15.
Reply With Quote
 


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
.net modification of a method (without decompilation) Shub-Nigurrath General Discussion 8 10-15-2013 21:04
search method passwords goku General Discussion 7 07-14-2010 02:15
Protection against point-h method? TheDutchJewel General Discussion 7 05-06-2004 01:32
What method to use? bartster General Discussion 11 02-08-2004 23:19


All times are GMT +8. The time now is 04:54.


Always Your Best Friend: Aaron, JMI, ahmadmansoor, ZeNiX, chessgod101
( Since 1998 )