More than two months after authorities shut down a massive Internet traffic hijacking scheme, the malicious software that powered the  criminal network is still running on computers at half of the Fortune 500 companies, and on PCs at nearly 50 percent of all federal government agencies, new research shows.

Source: FBI

The malware, known as the “DNSChanger Trojan,” quietly alters the host computer’s Internet settings to hijack search results and to block victims from visiting security sites that might help scrub the infections. DNSChanger frequently was bundled with other types of malware, meaning that systems infected with the Trojan often also host other, more nefarious digital parasites.