I guess you could call it karma. HD Moore's company, BreakingPoint, found that traffic was being diverted to a scammer Google page. This kind of cache poisoning attack on DNS servers is not unusual, however this particular case was because HD Moore is the man who created the Metasploit hacking toolkit. What's more this kind of poisoning was recently made a lot easier than it used to be, in no small measure thanks to the HD Moore Metasploit project being the first to release software that exploits the new technological method for doing so.
According to PC Advisor it would seem that HD Moore himself was not the target of this attack, however, just an unfortunately high profile and somewhat ironic victim. The attack was actually against an AT&T network in Austin, Texas which served BreakingPoint.
When AT&T got owned so did HD Moore.
It was only a matter of luck that the hack was spotted. When HD Moore went to visit google.com he was redirected to the scammer pages which were a direct clone of the Google site. Apart from the fact that the hacker forgot to use the NASA themed logo that Google had been using that particular day...