A simple misspelling of Google’s domain name could lead to a Web surfer’s worst nightmare.

In a new twist to the old practice of “typosquatting,” virus writers have registered a slight variation of Google Inc.’s popular search-engine site to take advantage of any users who botch the spelling of the google.com URL.

The malicious site, googkle.com, is infested with Trojan droppers, downloaders, backdoors and spyware, and an unsuspecting user only has to visit the page to be at risk of computer hijack attacks, according to a warning from Finnish anti-virus vendor F-Secure Corp.

A simple misspelling of Google’s domain name could lead to a Web surfer’s worst nightmare.

In a new twist to the old practice of “typosquatting,” virus writers have registered a slight variation of Google Inc.’s popular search-engine site to take advantage of any users who botch the spelling of the google.com URL.

The malicious site, googkle.com, is infested with Trojan droppers, downloaders, backdoors and spyware, and an unsuspecting user only has to visit the page to be at risk of computer hijack attacks, according to a warning from Finnish anti-virus vendor F-Secure Corp.

The typosquatters also launch a steady stream of pop-up Web pages with different .exe files.

One batch of exploits loads a malware package that includes two backdoors, two Trojan droppers, a proxy Trojan, a spying Trojan and a Trojan downloader.

It is not yet clear if the attack vector takes advantage of an unpatched version of Microsoft Corp.’s Internet Explorer. Redmond officials could not be reached for comment.

According to F-Secure’s alert, the attack scenario also includes a separate Trojan dropper that copies itself to the Windows System folder with a random name and drops a DLL that modifies the HOSTS file to block connection to several anti-virus Web sites.

Another executable also drops a DLL file into the Windows System folder and prompts a fake virus alert on a desktop. The fake alert warns the user about a computer infection and prompts the user to yet another malicious site promising virus protection.

The Web site offers links to several different sites offering anti-virus and spyware cleaners for download. Those downloads all turn out to be a “toolbar.exe” file that is actually an adware installer, which installs a spyware toolbar known as “Perez,” F-Secure said.

The practice of typosquatting was first spotted in the late 1990s and was a common tactic for pornography sites, used to generate traffic from misspelled Internet addresses.