Spammers adopt stealth tactics | The Register

Botnet controllers are switching to stealth tactics in a bid to avoid detection. Instead of mass mail-outs of spam and malicious code, they are adopting slower distribution tactics in a bid to avoid appearing on corporate security radars.

UK-based web security firm BlackSpider Technologies reports that one huge botnet, responsible for issuing 50m identical spam emails per day, compromises at least 150,000 distinct IP addresses. The use of a large number of machines – each sending out an average of 330 emails a day or around 40 per hour during the course of a working day – is a change from days of yore when a handful of compromised email servers would have been used to do the same job.

It’s well known that packages such as are used by spammers to control the distribution of junk mail broadband-connected PCs infected by viruses such as SoBig, but BlackSpider’s figures on the mail-out rate from compromised machines add a fresh perspective to the problem.

This is an ever increasing problem. Must read.


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