Today I looked up the most prolific botnets for the month of July.  Earlier this year the grum botnet was disrupted.  How have things changed since then?  Here’s a look at the top 15 botnets hitting our networks for the month of July by total mail volume:

My observations:

1. Cutwail is the #1 botnet, which was not surprising.  It usually occupies space among the top 3.
   
   
2. Grum is not yet dead.
   
   
3. Lethic is less prolific than it has been in the past.
   
   
4. The gheg botnet is way down the list.

Other than that, there’s not much new here from my previous musings about botnets.