October 1, 2003
Trojan.Qhosts is a virus that loads when a user loads an infected webpage. It exploits a vulnerability in active scripting in Internet Explorer. Microsoft does not yet have a patch to block this exploit.

The virus changes the exploited machines DNS servers setting it to access a specific DNS server that is no longer up. It also adds entry's to the exploited computers host file.

Further information and removal instructions can be found at: Link