- Ad injectors were detected on all operating systems (Mac and Windows), and web browsers (Chrome, Firefox, IE) that were included in our test.
- More than 5% of people visiting Google sites have at least one ad injector installed. Within that group, half have at least two injectors installed and nearly one-third have at least four installed.
- Thirty-four percent of Chrome extensions injecting ads were classified as outright malware.
- Researchers found 192 deceptive Chrome extensions that affected 14 million users; these have since been disabled. Google now incorporates the techniques researchers used to catch these extensions to scan all new and updated extensions.
The full article can be read here: http://googleonlinesecurity.blogspot.com/2015/03/out-with-unwanted-ad-injectors.html