A variant of the ZLob Trojan known as DNSChanger has been known to modify the DNS servers
on
your PC. Thus you get directed to malicious web sites instead of the web site you are
trying to get to.

Now there is a variant of the DNSChanger, installer ~300KB, that can use TCP port 80 and a
dictionary of passwords to modify the DNS Server list on SOHO Routers.

http://www.trustedsource.org/blog/42...s-into-routers
http://blog.washingtonpost.com/secur..._wirele_1.html

Some advice on the subject matter...
http://extremesecurity.blogspot.com/...-hijacked.html

--
Dave
http://www.claymania.com/removal-trojan-adware.html
Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp