The botnet ecosystem: do botnets need Windows?
Botnet clients have been seen in the wilds running on Unix-based systems, too. The extreme ease with which Windows can get infected, in addition to its market share, is responsible for the fact that most spam originates from compromised Windows machines. Unix systems running a LAMP stack are only as secure as the applications that run on them, which are abysmal. Sloppily written PHP applications have been the bane of many a sysadmin's existence. Within the last few years, the problem has become "why is our Web server spamming?"
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