In the U.S. rankings by ASN, seven out of ten are new, and NOC number 1 came up from number 9. Something pretty bad is going on. So bad Comcast didn't place in the top 10 at all, for the first time in recent memory!as well: AS 32613 IWEB-AS jumped from 8 to 1 for the month, with almost all the increase in the same last week of the month as for the U.S. problem ASNs.
There was even a similar curve in the World rankings, for Telefonica del Peru's AS 6147 SAA.
Our next step is to drill down to see if these ASNs were infected by the same botnet. We did that for the medical ASNs last month, but this is a much bigger spam event this month.