Kovter Group malvertising campaign exposes millions to potential ad fraud malware infections

Overview

Proofpoint researchers recently detected a large-scale malvertising attack by the so-called KovCoreG group, best known for distributing Kovter ad fraud malware and sitting atop the affiliate model that distributes Kovter more widely. This attack chain exposed millions of potential victims in the US, Canada, the UK, and Australia, leveraging slight variations on a fake browser update scheme that worked on all three major Windows web browsers. The attack has been active for more than a year and is ongoing elsewhere, but this particular infection pathway was shut down when the site operator and ad network were notified of the activity.

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