Massive "botnet" networks -- armies of infected computers formed by spreading a computer virus that orders compromised machines to phone home for further instructions, such as sending out spam or relaying passwords -- are sucking up personal data from millions of people at an alarming rate, and school and college networks are common targets of these attacks. A recent find by security researchers offers a glimpse at the damage done by one of these botnets and how hard it can be to shut them down.

Getting hacked is like having your computer turn traitor on you, spying on everything you do,...

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