The Internet brings remarkable benefits to society. Unfortunately, some people use it for harm and their own gain at the expense of others. We believe in the power of the web and information, and we work every day to detect potential abuse of our services and ward off attacks.
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
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:
This particular malware causes infected computers to send traffic to
Google through a small number of intermediary servers called “proxies.”
We hope that by taking steps to notify users whose traffic is coming
through these proxies, we can help them update their antivirus software
and remove the infections.
We hope to use the knowledge we’ve gathered to assist as many people as
possible. In case our notice doesn’t reach everyone directly, you can
run a system scan on your computer yourself by following the steps in
our Help Center article.
Source : Here