Cyber Criminals are targeting Yahoo’s advertising networks to deliver malware directly to the computers of users who is viewing the ads.
Security firm Malwarebytes, who discovered the attack on July 28, says that Yahoo is a victim of malvartising attacks in which exploit kits are used to redirect victims to the malware website.
The malvertising attack which does not require any user interaction, is believed to be one of the biggest in recent times due to the massive amount of traffic in Yahoo.
In one of the campaigns, the attackers used the Angler Exploit Kit - This exploit kit usually infect victim's machine with annoying software and malware that forces victims to pay the money to unlock their system.
The security firm said that it had informed Yahoo about the attack the very same day. Yahoo said that the malware campaign has been stopped and that the company is investigating the matter.
In one of the campaigns, the attackers used the Angler Exploit Kit - This exploit kit usually infect victim's machine with annoying software and malware that forces victims to pay the money to unlock their system.
The security firm said that it had informed Yahoo about the attack the very same day. Yahoo said that the malware campaign has been stopped and that the company is investigating the matter.
Although it is not yet possible to determine exactly how many people have been affected by the hack, but it could be large as Yahoo gets 6.9 billion visits a month.
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