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One limitation of most alphanumeric shellcode decoders, including those in * ALPHA2<http://skypher.com/wiki/index.php/Hacking/Shellcode/Alphanumeric/ALPHA2>
* and the soon-to-be-released
* is that they need to know where they are located in memory in order to
decode themselves and run correctly. This makes using a *nopslide* hard in most circumstances, because you mostly only need a *nopslide* if you do not know exactly where your shellcode is in memory to begin with.
I've developed a way to get around this problem, which I've described in
more detail here:
ALPHA3 has support for generating working alphanumeric shellcode with nopslides using this technique. I'm currently working on getting the rest of its code into releasable shape.
<http://skypher.com/index.php/2010/01/02/countslide-alphanumeric-getpc/> Berend-Jan Wever <firstname.lastname@example.org> http://skypher.com/SkyLined