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Showing posts tagged with Spam
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Daren Lewis | 29 Sep 2009 | 0 comments

Botnets are now responsible for distributing 87.9% of all spam, an increase of 2.9% since Q2 2009. With approximately 151 billion unsolicited messages each day being distributed by compromised computers, understanding who is responsible for such unprecedented levels is always of interest as, much like the threat landscape, the botnet landscape is ever changing. As highlighted in the latest analysis from MessageLabs Intelligence, the largest botnet now appears to be Rustock with an estimated 1.3 million to 1.9 million compromised computers in its control. However, estimated at half Rustock’s size, the most active botnet in terms of spam distribution is now the little-known botnet, Grum.

Both Grum and another botnet called Bobax have overtaken Cutwail as the most active spam-sending botnets, currently responsible for 23.2% and 15.7% of all spam respectively. Although significant in their own rights, their size and power highlight the dominance that Cutwail had in June...

Daren Lewis | 25 Sep 2009 | 0 comments

We've taken a closer look at spam on a regional/city basis in five large markets for September 2009, Just as we see differences in spam rates between countries we often see significant differences within countries:

  • The areas that are subjected to the highest levels of spam are generally those locations that are populated with a higher density of small-to-medium sized businesses. Similarly, the least spammed places are often home to some of the largest companies.
  • Between four million and six million computers scattered across the globe have been compromised by cybercriminals without the user’s knowledge. These computers now form robotic networks – Botnets, which are controlled by cybercriminals and used to send out more than 87% of all unsolicited mail, equating to approximately 151 billion emails a day
  • The global spam rate for September 2009 is 86.4 percent, but Canadian businesses are receiving more than their fair share, with levels...