While Pushdo has failed to grab headlines like the infamous Storm botnet and Conficker worm, according to recent reports, Pushdo is the second largest botnet on the planet—sending approximately 7.7 billion spam emails per day.¹ This means that Pushdo is single-handedly responsible for approximately one out of every 25 emails sent.² This number is likely to be much higher in Russia where most Pushdo spam occurs.