A benevolent virus has been used to harden more than 10,000 home routers against cyber-attacks, says a security firm.
Symantec says the Wifatch program is closing loopholes and fixing bugs on routers it infects.
http://www.bbc.com/news/technology-34423414
http://www.symantec.com/connect/blogs/there-internet-things-vigilante-out-there