A botnet is a collection of computers that are under the control of a person or group, usually facilitated by malware. These computers are often used to take part in DDoS attacks and spamming.

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Statistics on purposes of viruses/malware

Are there any resources that analyze the purpose or goal or the major viruses/malware out in the wild today? For example, what percentage are used to construct botnets (for DDoS or something else)? ...
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Setup and record outbound traffic from a botnet in a sandbox/secure environment

How do I record the outbound 'attack' traffic from a botnet on a Windows XP machine? The captured traffic will be in the Windows XP firewall log. I need to setup some kind of an experiment where I ...
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Why do botnets use IRC but not a web service for communication?

IRC seems still the most prominent way for communication within botnets. Why do attackers choose IRC? In my (very naive) opinion, to set up a web service is far more easier.
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Tools to identify and report hacking attempts originating inside reputable organizations?

Re: Should I report hacking attempts? - Server Fault Lots of people look at their own logs for attacks from the outside. But who regularly reports such attacks back to the source? I'm mainly ...