"Big Red"

Has anyone heard of "bigred.com"? A client has suddenly discovered that all of its browser queries that do not resolve (www.rubbishcharacters.com for e.g.) get diverted to the BigRed search engine web site. No one in the company is aware of having installed anything that could have intentionally have caused this effect for DNS failures. Anyone got any ideas what is going on here? Is it a known problem? Viral or otherwise? T.L.