Less than a month after Microsoft has crippled in cooperation with the U.S. authorities the Rustock botnet, it still makes a positive effect. The amount of spam is after shutting down the botnet slumped by 60 percent.
In mid-March 2011 is an important blow against Rustock managed affects significantly on the volume of spam. As it seems, the replacing of the Rustock spammers is more difficult than it was in previous botnet shutdowns.