Mozilla banned hundreds of malicious Firefox add-ons over the last weeks

Pierluigi Paganini January 27, 2020

Mozilla is intensifying the efforts to protect its users, in the last couple of weeks, the security staff has banned 200 malicious Firefox add-ons.

Over the past two weeks, Mozilla has reviewed and banned 197 Firefox add-ons because they were executing malicious code. The malicious Firefox add-ons were found stealing user data and for this reason, they were removed from the Mozilla Add-on (AMO) portal.

Mozilla also disabled the malicious add-ons in the browsers of the users who have already installed them.

The apps were using obfuscation to hide their source code and were downloading and executing code from a remote server, a behavior that violates the policy of the portal. Downloading code from a remote server could allow threat actors to execute malicious code within the browser once it will be dynamically downloaded from a server under their control.

Mozilla banned 14 Firefox add-ons ([1], [2]. [3]) because they were using obfuscated code and potentially hiding malicious code.

Most of the banned apps have been developed by 2Ring, a provider of B2B software.

Mozilla banned for the same reason six Firefox add-ons developed by Tamo Junto Caixa, and three add-ons that were fake premium products.

Mozilla also banned an unnamed add-onWeatherPool and Your SocialPdfviewer – toolsRoliTrade, and Rolimons Plus for collecting user data without consent.

The organization also banned for malicious behavior other 30 add-ons.

Firefox also reported the case of an add-on named Fake Youtube Downloader was spotted attempting to install a malware in users’ browsers.

Mozilla also banned Firefox Add-ons like EasySearch for Firefox, EasyZipTab, ConvertToPDF, and FlixTab Search were for intercepting and collecting user search terms, a behavior that violates the rules.

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Pierluigi Paganini

(SecurityAffairs – Mozilla, Firefox)

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