Internet advertisement networks provide hackers with an effective venue for targeting wide range computers through malicious advertisements. Previously it was reported by some security researchers that Yahoo's online advertising Network is one of the top ad networks were being abused to spread malware by cyber criminals





Recent report published by Fox-IT, Hackers are using Yahoo's advertising servers to distribute malware to hundreds of thousands of users since late last month that affecting thousands of users in various countries.

Clients visiting yahoo.com received advertisements served by ads.yahoo.com. Some of the advertisements are malicious," the



More than 300,000 users per hour were being redirected to malicious websites serving 'Magnitude Exploit Kit', that exploits vulnerabilities in Java and installs a variety of different malware i.e.

ZeuS

Andromeda

Dorkbot/Ngrbot

Advertisement clicking malware

Tinba/Zusy

Necurs "It is unclear which specific group is behind this attack, but the attackers are clearly financially motivated,"

Based on the same sample, the countries most affected by the exploit kit are Romania, Great Brittain 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. ," the firm reported More than 300,000 users per hour were being redirected to malicious websites serving 'Magnitude Exploit Kit', that exploits vulnerabilities in Java and installs a variety of different malware i.e.According to the researchers, approximate 9% users of total visits per hour i.e. 27,000 users per hour, were being infected.

Loman, a security researcher and developer of the Hitman Pro anti-malware software, also confirmed the issue on Marka security researcher and developer of the Hitman Pro anti-malware software, also confirmed the issue on Twitter