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Home > Cybersecurity > Popular Chrome ad blocker injects ads

Popular Chrome ad blocker injects ads

Popular Chrome extension, AllBlock is making deceptive ad-injections according to the researchers at Imperva Research Labs.


Erdem Yasar Erdem Yasar
October 15, 2021
1 min read
Popular Chrome ad blocker injects ads

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 researchers found unknown malicious domains associated with an ad injection script in August of 2021. The script is capable of sending the list of the links on a web page to a remote server and the server sends a list of domains that it wants to redirect. Thus, if a user clicks on a link, the traffic is hijacked to a different URL. The JavaScript file uses various methods to disturb analysis, such as clearing the debug console every 100 ms and it excludes major search engines to avoid detection.

Popular Chrome ad blocker injects ads
Popular Chrome ad blocker injects ads

Imperva stated that upon close examination, they noticed that AllBlock’s background script was injecting a JavaScript code snippet into new tabs. The code connects back to the extension via a standard browser extension communications channel and listens for messages. When it receives the base64 encoded code from the extension, decodes it. The response that the extension received is a JSON that includes base64 encoded properties data and URLs.

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.

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Tags: Imperva
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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