When you visit one of these infected sites, you’ll get a fake update notification (hence the name) that kicks off the infection. You might wonder how this attack could pop up on thousands of websites for months without detection until recently. This is a clever attack that uses a light touch with a site’s visitors. For one, it only serves the fake update notification once per IP address. The update notification (which is a redirected URL) is themed to match your browser. So Firefox users get a page about running an old version of Firefox, and it’s the same for Chrome users. There’s a version for Flash updates, too. The styling of these pages looks spot-on.
The end result of an infection with the FakeUpdates campaign is that your system runs the Chtonic banking malware, which is a variant of ZeusVM. That gives the attacker full control of a system including file transfer and remote access.
Now that the cat’s out of the bag, site operators and CMS systems can begin purging FakeUpdates from websites. It won’t go away overnight, and it might just mutate to avoid detection and come back later. Your best bet is never to trust popups that tell you to download something, even if they look legit. Only download on your own terms.
Now read: 20 Best Tips to Stay Anonymous and Protect Your Online Privacy