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February 1, 2023

Malware attack hits thousands of Yahoo users per hour

Romania, UK and France have been the main target.

A malware attack hit Yahoo’s advertising server over the last few days, affecting thousands of users in various countries, an Internet security firm said, CNN informs. In a blog post, Fox-IT said Yahoo’s servers were releasing an “exploit kit” that exploited vulnerabilities in Java and installed malware. “Clients visiting yahoo.com received advertisements served by ads.yahoo.com,” the internet security firm said. “Some of the advertisements are malicious.” Fox-IT, which is based in the Netherlands, focuses on cyber defense. It estimates tens of thousands of users were affected per hour. “Given a typical infection rate of 9 percent, this would result in around 27,000 infections every hour,” the company said. “Based on the same sample, the countries most affected by the exploit kit are Romania, Great Britain and France. At this time it’s unclear why those countries are most affected, it is likely due to the configuration of the malicious advertisements on Yahoo.”
If a computer infected with malware is connected to a network, attackers can often access other connected systems and servers. Yahoo said it is aware of the attack, and is monitoring and blocking such advertisements.
SurfRight, another security company in the Netherlands, confirmed for pcworld.com that Yahoo’s advertisement network was redirecting to an exploit kit. SurfRight and Fox-IT both said they first detected signs of the infection on December 30, which will likely push up the number of computers that have been infected.
The infected site proceeds to install a variety of malware to the user’s device including those called ZeuS, Andromeda, Dorkbot, Tinba or Necurs, Fox IT says.

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