As we have reported earlier, cybercriminals were able to use Yahoo’s java-based ad placement system to distribute malware. When people saw the ad and they click on the ad, they get directed to an attack site. The attack site would then install malware onto peoples computers. Normally, malware isn’t obvious. It’s not like where your anti-virus program automatically seeks and destroys such malicious programming.
Often times, malware take the form of Trojan horses. These are innocent looking bits of data downloaded on your computer. When you do certain things with your browser, the Trojan horse is activated and then it would start trying to overcome your systems defenses or trick you into disabling your system’s defenses so the Trojan can load far more fatal and dangerous pieces of software from the internet. According to Yahoo, the ad-based malware attack visitors suffered was far bigger than they anticipated. While the exact number of affected computers isn’t known yet. According to recent estimates, the number of affected units may reach up to 2 million computers. In the big scheme of things, this may seem small, 2 million computers. However, if you look at how powerful this malware programs can be depending on the kind of spy ware or viruses they install and activate, this 2 million can easily grow into many more computers if the virus being used spreads malware in turn.
Interestingly enough, Yahoo isn’t offering direct information or resources to help people that think they got infected by the hack attack. Instead, Yahoo is offering standard tips for windows users. These standard tips, of course, involve making sure that you’re running the latest version of the version of Windows that you are running. In other words, your windows installation must be properly patched. Also, they recommend that you update to the latest version of Adobe and Java.