Global spam levels have dropped by a third, according to Symantec’s March 2011 MessageLabs intelligence report.
And this is mainly due to the take-down of the Rustock botnet, which we reported on last month. Rustock had been sending almost 14 billion mails per day, 28.5% of spam sent from botnets worldwide in March (before it was shut down, mid-month, of course).
MessageLabs notes that Bagle has taken over from Rustock as the most active spamming botnet.
Paul Wood, MessageLabs Intelligence Senior Analyst, commented: “It remains to be seen whether the criminals behind Rustock will be able to recover from this coordinated effort against what has become one of the most technically sophisticated botnets in recent years.”
“Rustock has been a significant part of the botnet and malware landscape since January 2006, much longer than many of its contemporaries.”