Security vendor Trend Micro has fallen victim to a widespread Web attack that splashed malicious software onto hundreds of legitimate Web sites in recent days.

A Trend Micro spokesman confirmed that the company's site had been hacked Thursday, saying that the attack took place earlier in the week. "A portion of our site -- some pages were attacked," said Mike Sweeny, a Trend Micro spokesman. "We took the pages down overnight Tuesday night -- and took corrective action."

The infected Web pages are not obviously malicious, but the attackers have added a small bit of JavaScript code that redirects visitors' browsers to an invisible attack launched from servers based in China. This same technique was used a year ago, when attackers infected the Web sites of the Miami Dolphins and Dolphins Stadium just prior to the 2007 Super Bowl XLI football game.