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Re: exploits for client side attacks not work
From: Atul Agarwal <atul () secfence com>
Date: Tue, 22 Jun 2010 12:33:30 +0530

Yes, addition of a custom packer for js based exploits in framework itself
will be a plus.

One thing more that can be added is the option of setting up multiple
filters, and user defined chaining, in PDF based exploits.

Maybe Someone can port some of Origami framework's (
http://seclabs.org/origami/) code (as its in ruby too) to msf.

Thanks,
Atul Agarwal
Secfence Technologies


On Tue, Jun 22, 2010 at 1:44 AM, Spring Systems <korund () hotmail com> wrote:

 Thank you for helpful info. I agreel, to obfuscate the javascript is not
so difficult task. But it is much more complex to do all this manually,
separately, then assemble parts manually into the final exploit file.
Metasploit is handy as it allows to create exploits automatically. It would
be handy, if Metasploit had some javascript encoding/packer module which
allowed to encode a javascript and change the encoding algorithm on the fly
(include adding custom encoding manually) depending on situations or tasks.
What do you think?

Best Regards,

------------------------------
From: atul () secfence com
Date: Tue, 22 Jun 2010 00:09:16 +0530
Subject: Re: [framework] exploits for client side attacks not work
To: korund () hotmail com
CC: framework () spool metasploit com


Hello,

Yes, only encoding the payload is not going to help you.

As an example, in order to make the exploit undetectable, you will have to
obfuscate the javascript that triggers the exploit (which is valid for most
PDF exploits - geticon(), newplayer() et al, libtiff doesn't utilise js for
exploitation).

Obfuscating the javascript is not particularly difficult, and you can use
publicly available js packers for the same (eg.
http://dean.edwards.name/packer/, <- heavily used). As they are public,
bear in mind, most AV's will flag it. Developing a custom javascript packer
is also not much difficult. Also, you could pack the js again and again
using same or different packers.

A nice place to find obfuscated js exploits is the exploit packs, which you
can get at any "underground" forum. Also keep checking the MDL (
http://malwaredomainlist.com/) for samples. Look into them.

Another approach to make the PDF exploits undetectable is to chain the
stream filters. Refer to
http://blog.didierstevens.com/2008/05/19/pdf-stream-objects/ for details.

I know, all the above will have to be done manually, outside metasploit.
But hey, metasploit is available to the AV guys too, and they can always
generate the samples and add signature/heuristics to the ways available in
the msf. So you will have to think differently.

Hope it helped.


Thanks,
Atul Agarwal
Secfence Technologies


On Mon, Jun 21, 2010 at 8:09 PM, Rob Fuller <mubix () room362 com> wrote:

AVs are flagging on the exploited function (or should be), which is
the basis for the exploit. Encoding the payload a million times will
not help you. You are welcome to try for yourself though.



--
Rob Fuller | Mubix
Room362.com | Hak5.org



On Mon, Jun 21, 2010 at 9:17 AM, Spring Systems <korund () hotmail com>
wrote:

PDF exploits for client side attacks not work at all, due 100% detection
by
AVs as exploits.
This PDF will be useless unless Metasploit change payloads encoding
scheme,
allowing to select verious encoding options
during the exploit creation.
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