Official Google Blog: Using data to protect people from malware

Malware gone (via) Google; see the full post (and/or this WSJ article) for details

As we work to protect our users and their information, we sometimes discover unusual patterns of activity. Recently, we found some unusual search traffic while performing routine maintenance on one of our data centers. After collaborating with security engineers at several companies that were sending this modified traffic, we determined that the computers exhibiting this behavior were infected with a particular strain of malicious software, or “malware.” As a result of this discovery, today some people will see a prominent notification at the top of their Google web search results:

Official Google Blog: Using data to protect people from malware