Spam levels have decreased by 33.6% only two weeks after Some 12.4% of all spam came from the Russian Federation, making it the most frequent source of spam during March. This is mostly attributed to the fact that Russia is home to large botnets including Bagle, Lethic and Maazben. India has the second highest spam rate at 8.8% and Brazil follows at 5.9%. US-based operations were responsible for 4.5% of spam, ahead of the Ukraine (4.4%), Colombia (3.9%), Romania (3.8%), Argentina (2.8%), Vietnam (2.5%) and the Republic of Korea (2.5).