yahooearningslogo

Yahoo Users Infected with Malware After Ads Hijacked

  |  January 6, 2014   |  Comments

Yahoo has confirmed that their ads on European websites were subject to a malware injection attack from Dec 31 to Jan 3.

Hundreds of thousands of Yahoo users in European countries including the UK, France and Romania may have been infected with malware injected into advertising hosted on Yahoo websites.

Dutch company Fox-IT made the discovery at the end of last week, saying users who visited Yahoo would be confronted with advertisements that would direct them to external sites hosting malware that exploits Java security flaws.

The ads were served in iframes by Yahoo's advertising service, and were hosted on external sites. Upon clicking the advertisements, users would be redirected to a selection of other domains, all reporting the same Netherlands-based IP address.

The malware users were faced with include money-grabbing Zeus Trojan, botnet software Andromeda and other malware associated with advertising.

Fox-IT estimates that the traffic to the malware hosts was around 300,000 visits per hour. On the assumption that nine percent of those users would ultimately be infected, the firm says around 27,000 infections could have occurred every hour over the four days the adverts were present.

Yahoo confirmed the news in a statement shared with V3: "From 31 December to 3 January on our European sites, we served some advertisements that did not meet our editorial guidelines – specifically, they spread malware. On January 3, we removed these advertisements from our European sites."

The statement added that users in other regions and those using Apple's Mac OS and mobile devices were not affected. "We will continue to monitor and block any advertisements being used for this activity. We will post more information for our users shortly."

The attack bore a resemblance to the one carried out on the PHP.net website, Fox-IT said. In recent months, popular services including Dropbox and Microsoft Silverlight have found themselves under attack, highlighting the risk businesses face when allowing employees to use personal service on their work devices, or allowing them to bring personal devices into work.

This article was originally published on V3.

Tags:

ClickZ Live San Francisco This Year's Premier Digital Marketing Event is #CZLSF
ClickZ Live San Francisco (Aug 11-14) brings together the industry's leading practitioners and marketing strategists to deliver 4 days of educational sessions and training workshops. From Data-Driven Marketing to Social, Mobile, Display, Search and Email, this year's comprehensive agenda will help you maximize your marketing efforts and ROI. Register today!

ABOUT THE AUTHOR

Michael Passingham

Michael Passingham joined V3 as a reporter in June 2013. Prior to working at V3, Michael spent time at computing magazine PC Pro. Michael covers IT skills, social media, tech startups and also produces V3's video content.

View Michael's Google+ profile

COMMENTSCommenting policy

comments powered by Disqus

Get ClickZ Media newsletters delivered right to your inbox. Subscribe today!

COMMENTS

UPCOMING EVENTS

Featured White Papers

BigDoor: The Marketers Guide to Customer Loyalty

The Marketer's Guide to Customer Loyalty
Customer loyalty is imperative to success, but fostering and maintaining loyalty takes a lot of work. This guide is here to help marketers build, execute, and maintain a successful loyalty initiative.

Marin Software: The Multiplier Effect of Integrating Search & Social Advertising

The Multiplier Effect of Integrating Search & Social Advertising
Latest research reveals 68% higher revenue per conversion for marketers who integrate their search & social advertising. In addition to the research results, this whitepaper also outlines 5 strategies and 15 tactics you can use to better integrate your search and social campaigns.

WEBINARS

    Information currently unavailable

Jobs

    • Internet Marketing Campaign Manager
      Internet Marketing Campaign Manager (Straight North, LLC) - Fort MillWe are looking for a talented Internet Marketing Campaign Manager to join the...
    • Online Marketing Coordinator
      Online Marketing Coordinator (NewMarket Health) - BaltimoreWant to learn marketing from the best minds in the business? NewMarket Health, a subsidiary...
    • Call Center Manager
      Call Center Manager (Common Sense Publishing) - Delray BeachWanted: Dynamic Call Center Manager with a Proven Track Record of Improving Response...