I just made it up. I meant to describe malicious code designed not just by hackers and vandals, but by well-financed government agencies as weapons of war. I have no direct evidence of this, except for a lecture I once saw by a US computer security expert (sorry, I can provide no further documentation, I didn't take notes) who described them as software designed to deliberately disrupt computer networks in time of war or international tension. I know absolutely nothing about the defensive software you mentioned, but if it is of Chinese origin, it is not inconceivable that it might be equipped with a "back door" designed to allow entrance of attack viruses.