Techworld: Rustock botnet ditches encryption to ramp spam
“TLS adds a small but cumulative overhead to server email processing, which ties up mail servers but also affects the rate at which spam is sent. Why Rustock’s controllers adopted the technique at all was never clear but might have been connected to a misplaced belief that it would make it harder for servers to filters its activity or detect the command and control system used to direct its activity.”
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