The sudden death of Rustock, one of the more famous spammy botnets, may not decrease the amount of spam sent globally in the long term according to Internet security outfit, Commtouch.
Avi Turiel (opens in new tab), a researcher for the company, wrote a post on the company's blog where he compared the global level of spam from the past week (10th to 17th of March) to what happened to the world of spam when McColo, an internet service provider that specialised in sending spam emails, was taken offline.
While the latter clearly shows that there has been a significant disruption in the amount of spam sent, the graph produced last week shows some that peaks have disappeared but not the background traffic.
Turiel notes that the sudden increases over specific days and less traffic on others are "fairly typical" and that there is no dramatic drop for average levels. There's a single massive spike on Wednesday which he attributes to Rustock being "cut off in mid attack".
He explains that Commtouch tracks spam traffic globally and that Rustock, while being one of the more infamous botnets, might not have been the most influential one before adding that botnet operators are now moving from centralised superstructure to larger groups of smaller botnets that are more resilient to disruption.