By far the biggest threat to users in November was drive-by downloads, attacks that result in malware being downloaded to users’ computers when they visit infected sites.
Here’s a brief overview of how these attacks infect computers. First of all, a user visits an infected site that contains a redirect script. The redirect leads to a script downloader which in turn is used to launch exploits. These breaches allow malicious executable files to penetrate the computer. They are primarily backdoors and Trojans that, if successfully launched, give cybercriminals full control over the infected system. In most cases, users will not even be aware of the danger because all drive-by attacks happen without their knowledge.