A news item about botnets from Secureworks includes some useful information about how botnets are used and protected. They are used to distribute spam (including money mule come-ons, fake pharmaceuticals, enlargement products, loans and more) and malware.
The estimated sizes of the botnets range up to about 175,000 compromised machines, with most being a few tens of thousands, well short of the millions that lurid mainstream news headlines sometimes claim. Still tens of thousands of broadband connected computers can do a lot of damage.
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