A group of cybercriminals called DarkSpectre is believed to be behind three campaigns spread by malicious browser extensions: ShadyPanda, GhostPoster, and Zoom Stealer. Malwarebytes Labs wrote about the ShadyPanda campaign in December 2025, warning users that extensions which had behaved normally for years suddenly went rogue.
After a malicious update, these extensions were able to track browsing behavior and run malicious code inside the browser. Also in December, researchers uncovered a new campaign, GhostPoster, and identified 17 compromised Firefox extensions.
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Source: Malwarebytes Labs
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