Top 10 Malware Threats To Microsoft PCs

4. Worms

Detections of Dorkbot helped drive worms into fourth place. Dorkbot is one of a slew of IRC-based worms that spread through USB sticks and other removable drives. The malware can also spread through instant messaging programs and social networks, Microsoft said. The Conficker worm continues to fuel most of the activity in this category and remains the second most commonly detected family on computers joined on the same network.

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