When shopping for something online or simply deciding on a service or product, many consumers head online to read reviews. One problem is it is very easy to put fake reviews. Vendors may put fake positive reviews and rivals may add fake negative reviews. It is a part of the online world, but it leaves a lot of confused customers.
KrebsOnSecurity was informed by a reader that there was a fake Microsoft Authenticator web extension on the Google Chrome Store. The researcher investigated the profile behind the extension and found five user reviews. Three of those reviews were warning users to stay away, while the other two were three and four-star reviews.
One by a so-called Theresa Duncan could not contain its delight, stating about the extensions “It's great!… I've only had very occasional issues with it.”
The other from Anna Jones the tool have “Very convenient and handing”, whatever that means.
Google Chrome confirmed that the email address associated to the account that published the fake Microsoft Authenticator also handles an extension called “iArtbook Digital Painting.”
The iArtbook extension was also removed, but before had claimed three reviews from only 22 installs. All these reviews were positive.
Multiple Fake Extensions
Investigating the accounts of the people who left these positive reviews, Krebs found similar reviews across other iffy web extensions. More fake extensions and more fake reviews. Over a 24-hour investigation, the researcher found over 100 false positive reviews across a group of fraudulent web extensions.
39 reviewers left positive feedback on extensions that were clearly ripping off major brands and asked for financial data. 25 developer accounts were associated with many banned apps. And 45 malicious extensions with an overall download base of around 100,000.
Krebs reached out to Google, but the company did not respond. However, it has removed all the fraudulent extensions from Chrome.
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