According to Microsoft, a persistent malware campaign has been actively distributing an evolved browser modifier malware at scale since at least May 2020. At its peak in August, the threat was observed on over 30,000 devices every day. The malware is designed to inject ads into search engine results pages. The threat affects multiple browsers—Microsoft Edge, Google Chrome, Yandex Browser, and Mozilla Firefox—exposing the attackers’ intent to reach as many Internet users as possible.
Microsoft Report: https://www.microsoft.com/security/blog/2020/12/10/widespread-malware-campaign-seeks-to-silently-inject-ads-into-search-results-affects-multiple-browsers/; More information: https://arstechnica.com/information-technology/2020/12/ongoing-malware-attacks-are-hitting-users-of-4-major-browsers/