Massive DNS poisoning attacks in Brazil

Millions of Internet users in Brazil may have been exposed to malware after the DNS caches of their ISPs were modified to redirect them to servers controlled by cybercriminals.

The attacks work by poisoning the domain name system cache that the service providers use to translate domain names such as google.com into internet protocol numbers such as 74.125.224.144. By replacing legitimate IP addresses with ones leading to servers controlled by attackers, the hack is causing end users to be directed to sites that exploit software vulnerabilities on their computers.

"Brazil has some big ISPs. Official statistics suggest the country has 73 million computers connected to the Internet, and the major ISPs average 3 or 4 million customers each. If a cybercriminal can change the DNS cache in just one server, the number of potential victims is huge," said Kaspersky Lab expert Fabio Assolini.

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