Symantec's MessageLabs division reports that spam volume has decreased in March by two percent following the takedown of the Rustock botnet, but warns that Bagle is taking its place.
In its monthly intelligence report [pdf], the Symantec researchers point out that last month 83.1% of the global spam traffic was generated by botnets, which is lower than the 2010 average rate of 88.2%.
The Rustock botnet which was taken down in mid-March by Microsoft and other security companies, was responsible for 28.5% of the total.
