How payloads (shellcodes) used in exploiting

[rrawal at ipolicynetworks.com (Rawal, Rajesh)]

Thanks Jerome,

Means to avoid badchars and for ID/PS evasion reasons, shellcodes being XORed.

-----Original Message-----
From: Jerome Athias [mailto:jerome.athias at free.fr]
Sent: Thursday, March 29, 2007 3:03 PM
To: framework at metasploit.com
Subject: Re: [framework] How payloads (shellcodes) used in exploiting

Hi,

it is due to the fact of the Metasploit Framework uses kind of magic and hexa voodoo!...

After joking, yes the shellcode has to be sent to the target to having it running.
To avoid badchars and for ID/PS evasion reasons, the base code of the shellcode (called payload) will me modified by 
the Framework before to be sent to the target. (ie: XORed) So yes it could be different every time.
A way to retrieve it in your packets is to attach a debugger to the target application/service and see what it 
receives, and then compare this with your capture.

Note that in the version 2 of the MSF, you can view the shellcodes's codes (:p) in 
*\Metasploit\Framework2\home\framework\src\shellcode\

I hope it helps
/JA

Rawal, Rajesh a ?crit :
> Hi,
>
> I am using metasploit framework 3, exploiting windows and linux
> applications.
> I have captured packets using ethereal, but I didn't find the payload
> (position) used during the exploittation.
>
> For e.g.
>
> Exploit used was "windows/smb/ms06_040_netapi" and used payload
> "windows/shell_bind_tcp" and it successfully exploited remote host and
> got command of remote host machine. Also taken packet capture during
> this process.
> I m not able to find payload of "windows/shell_bind_tcp" in packet
> capture.
>
> 1. Can I know where this payload exist (where it comes during this
> sesion) in packet capture?
> 2. Does these payloads (shellcodes) differs in every new exploit attemts?
>
> waiting for positive response
>
> Regards
>
> Rajesh Rawal
> AMTS
> *iPolicy Networks*
> **NSEZ Noida | India
> Tel. +91-120-2567001,xtn-1246
> Cell +91-9899401874
>
> www.ipolicynetworks.com <http://www.ipolicynetworks.com/>
>
>
>
>
>
>
>
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