![]() ![]() ![]() Altogether they’ve been downloaded 87 million times. They were downloaded 55 million times combined.įinally, armed with many samples of malicious extensions, he conducted an even more thorough search of Google’s store and discovered 34 malicious extensions with completely different core functionalities. Next, Palant searched the Chrome Web Store for other extensions accessing this server and found a couple dozen plugins with similar additional functionality. However, inside this extension interesting “additional functionality” was discovered: the plugin accessed a serasearchtopcom site, from where it loaded arbitrary code on all pages viewed by the user. PDF Toolbox boasted an impressive user base and good reviews, with close to two million downloads and an average score of 4.2. At first glance, it was a perfectly respectable plugin for converting Office documents and performing other simple operations with PDF files. It all began when independent cybersecurity researcher Vladimir Palant found an extension called PDF Toolbox containing suspicious code in the Chrome Web Store. ![]() Malicious extensions in the Chrome Web Store We explain what these extensions are and why they’re dangerous. The most popular of these extensions had over nine million downloads, and altogether these plugins had been downloaded around 87 million times. Not so long ago, a few dozen malicious plugins were discovered in the Chrome Web Store (the official browser extension store for Google Chrome).
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