According to wikipedia(http://en.wikipedia.org/wiki/DNS_changer_malware), this was caused by rogue dns servers, which ought to be closed anyway.
However, the media always likes to create mountain out of molehill, which is what has happened in this case too. Simply resetting the hosts file and changing dns servers would 'rectify' these unconnected computers, so where do the antiviruses come into picture ?
It clearly looks a hype created by anti-virus companies...
The malware was pretty smart in redirecting users through a different server. Not only did they try to benefit from monitoring HTTP traffic routed through proxies, they served ads through these proxies to cash in on the botnet even if no passwords or sensitive information was stolen. Although wrong, you cannot but help appreciate the idea behind the attack.
I initially thought that major ISPs were contacted to remove folks and their accounts from their servers and that just did not make sense. This is media fluff and that makes much more sense.
I sometimes feel that Viruses are made by Anti-Virus company so as they have a job to do
Evidence ? This may well be true for some companies but I am not sure how it applies to the DNS redirection virus.