Malicious browser extensions hit 4.3M users

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A long-running malware campaign quietly evolved over several years and turned trusted Chrome and Edge extensions into spyware. A detailed report from Koi Security reveals that the ShadyPanda operation affected 4.3 million users who downloaded extensions later updated with hidden malicious code.

These extensions began as simple wallpaper or productivity tools that looked harmless. Years later, silent updates added surveillance functions that most users could not detect.

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How the ShadyPanda campaign unfolded

The operation included 20 malicious Chrome extensions and 125 on the Microsoft Edge Add-ons store. Many first appeared in 2018 with no obvious warning signs. Five years later, the extensions b