Program to "Help" Spammer?

So I received email from somebody asking if I was the "Bob" they'd talked to about Stealth programs. Upon further conversation, it appeared that they were looking for an add-on to enable their $99 Stealth spamware program to use foreign systems to increase their undetectability. It would be nice to "help" these people increase their SLACK and make their system as undetectable and untraceable as possible, preferably so untraceable that nobody ever sees it again. Does anybody have pointers to an executable out on the web that will look big enough to be believable and create lots of SLACK on their disk drives? "Bob" Dobbs