Researchers at Imperva Research Labs announced that they have discovered a new ad injection campaign led by a popular Chrome and Opera extension, AllBlock. Ad injection is a method to insert unauthorized advertisements into a web page. It can be originated from multiple sources, including browser extension, malware, or stored cross-site scripting. Scammers are using this method to generate revenue and steal advertising impressions from authorized advertisement providers.
Ad injection scripts
Imperva stated that they believe that this is a part of a larger campaign and scammers are using different delivery methods and more extensions. The researchers also stated that the ad injection method can impact almost any site and it also affects site performance and user experience negatively by making them load slower and harder to use.