"Joe Stewart, director of malware research for SecureWorks, said
some botnets might remain disconnected. The three largest spam
botnets on the Internet appear to be stranded and unable to contact
more than a small number of their control servers, according to
Marshal, a computer security firm in the United Kingdom that tracks
"The shutting down of McColo may have also slowed one of the
most aggressive e-mail-address harvesting services, anti-spam
groups said. Matthew Prince, chief executive of Unspam Technologies
and founder of Project Honey Pot, a collaborative effort that
gathers intelligence about the world's largest spam networks, said
that since June 2006, crawler bots hosted at McColo were
responsible for more than 30 million spam messages sent to the
project's e-mail traps."
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