The Wikimedia Foundation is warning its millions of visitors that if they re seeing ads appearing on any of the Foundation s Web sites, then their computer is probably infected with malware. The Foundation issued a statement on Monday clarifying that it never runs ads on the Web site for Wikipedia. Visitors who are seeing ads for for-profit firms have likely been the victim of a Web based attack, including malicious browser plug-ins, the statement reads. The warning comes amid other reports of widespread attacks from compromised Web sites.
Source: https://threatpost.com/those-wikipedia-ads-they-mean-youre-infected-malware-051612/76571/