Trend Micro, which said it had been tracking the DNS Changer botnet since 2006, added that the alleged criminals updated the malware daily to change the DNS (domain name system) settings of each bot. ..

The FBI has posted instructions (download PDF) that people can use to determine whether their DNS records have been scrambled by the alleged hackers.

The agency has also created a tool that checks for DSN settings that may be among those controlled by the gang.