Google is warning users of its search engine about the possibility of becoming infected with malware after spotting unusual activity on one of its servers.

Damian Menscher, security engineer at Google, writes on the official company blog that some users may be sending or receiving a particular strain of malware.
“As we work to protect our users and their information, we sometimes discover unusual patterns of activity,” he writes.
“Recently, we found some unusual search traffic while performing routine maintenance on one of our data centres. After collaborating with security engineers at several companies that were sending this modified traffic, we determined that the computers exhibiting this behaviour were infected with a particular strain of 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.”