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Tuesday, September 02, 2008
Zombie network explosion
The number of compromised zombie PCs in botnet networks has quadrupled over the last three months, according to figures from the Shadowserver Foundation. The clear trend within these figures is upwards, with a rise in botnet numbers of 100,000 to 400,000 (if 30 day entropy is factored into equations) or from 20,000 to 60,000 (for five day entropy).
Shadowserver figures suggest the number of command and control servers has actually decreased over the last month, following a spike in activity back in July.
Not much by way of email malware activity has been monitored, so if the latter explanation is true, then drive-by download attacks are playing a bigger role in spreading botnet client infestation.