The security firm Proofpoint is writing about a new and “improved” version of DNSChanger, an exploit kit that attacks home routers in order to serve malicious advertisements to anyone connecting through the Internet using that router. From the Proofpoint analysis:
Since the end of October, we have seen an improved version of the “DNSChanger EK”  used in ongoing malvertising campaigns. DNSChanger attacks internet routers via potential victims’ web browsers; the EK does not rely on browser or device vulnerabilities but rather vulnerabilities in the victims’ home or small office (SOHO) routers.
Most often, DNSChanger works through the Chrome browser on Windows desktops and Android devices. However, once routers are compromised, all users connecting to the router, regardless of their operating system or browser, are vulnerable to attack and further malvertising.The router attacks appear to happen in waves that are likely associated with ongoing malvertising campaigns lasting several days. Attack pattern and infection chain similarities led us to conclude that the actor behind these campaigns was also responsible for the “CSRF (Cross-Site Request Forgery) Soho Pharming” operations in the first half of 2015 .