Even though the DNSChanger safety net deadline expires in just two weeks, 12 per cent of Fortune 500 firms still have at least one infected machine on their network, according to a new survey.
DNSChanger screwed up the domain name system (DNS) settings of compromised machines to point surfers to rogue servers, redirecting surfers to dodgy websites as part of a long-running click-fraud and scareware distribution racket. The FBI dismantled the botnet's command-and-control infrastructure back in November, as part of Operation GhostClick.