Microsoft says that at its peak, Adrozek had controlled more than 30,000 devices a day.

Microsoft has raised the alarm today about a new malware strain that infects users’ devices and then proceeds to modify browsers and their settings in order to inject ads into search results pages.

Named Adrozek, the malware has been active since at least May 2020 and reached its absolute peak in August this year when it controlled more than 30,000 browsers each day.

But in a report today, the Microsoft 365 Defender Research Team believes the number of infected users is much, much higher. Microsoft researchers said that between May and September 2020, they observed “hundreds of thousands” of Adrozek detections all over the globe.

Based on internal telemetry, the highest concentration of victims appears to be located in Europe, followed by South and Southeast Asia.

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