Payload Bugs ?

[security at vahle.de (Thomas Werth)]

ok, but how do i append ?
i doubt $payload .= "sub esp,3500" would do it, am i wrong ?
How would i exactly append this in perl and how in msf.rb file ?

J. M. Seitz schrieb:
> I think a simple:
>
> sub esp,3500 
>
> Would do it, prepend to your shellcode. 
>
> JS
> > -----Original Message-----
> > From: Thomas Werth [mailto:security at vahle.de] 
> > Sent: Tuesday, August 28, 2007 10:50 PM
> > To: framework at metasploit.com
> > Subject: Re: [framework] Payload Bugs ?
> >
> > Patrick Webster schrieb:
> > > I assume your german return address is correct.
> > >
> > > Try using a shellcode with a stack adjustment of -3500.
> > >
> > > Otherwise your payload may be using bad characters which are not 
> > > accepted, or the payload code is changed by other 
> > instructions before 
> > > you execute, by the target application?
> > >
> > > -Patrick
> > How exactly can i do this ? This sounds really interessting, 
> > but i didn't find a "Adjust Stack for dummies guide" ;) Can 
> > you gimme a small example ?