Adware:W32/Superfish

Classification

Spyware

Adware

W32

Adware.superfish

Summary

Adware:W32/Superfish is a program pre-installed on some Lenovo consumer laptop models that surreptitiously inserts advertisements into webpages by either injecting JavaScript into non-encrypted web traffic or, for encrypted traffic, by using a self-signed root certificate that misrepresents itself as the official certificate of the website being viewed.

Removal

Automatic action

Once detected, the F-Secure security product will automatically remove the Superfish VisualDiscovery application from the system and the affected Superfish certificate from the Windows Certificate Store.

Firefox browser users: manual action needed

Take note that F-Secure products will not remove the Superfish certificate from Mozilla products. To do so, follow the instructions provided by Lenovo at:

Removal tool

Lenovo has published a free Superfish uninstall tool, available from:

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Technical Details

Adware:W32/Superfish is a program pre-installed on some Lenovo consumer laptop models that surreptitiously inserts advertisements into webpages viewed by the user. According to a comment from Lenovo, the advertising content is determined based on analysis of images displayed during browsing, in order to display similar products.

The Superfish program has raised questions among privacy advocates over the silent interception and injection of content via JavaScript into non-encrypted web traffic. Of more concern is its ability to intercept and inject content into encrypted traffic, in what is known as a 'man-in-the-middle' attack. To do so, Superfish uses a self-signed root certificate that misrepresents itself as the official certificate of a HTTPS website visited by the user; this then allows the program to insert its own content into the website content being displayed to the user.

For more information, see:

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