What could push the U.S.
from 13 to 2 in worldwide SpamRankings.net, and way up to number one
for the last week of February 2012?
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!
NOC has had this problem before, in July and November 2011, but never with this amount of spam volume. And this time many other ASNs show the same pattern.
The same issue may be in the
Canadian rankings
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.
-jsq
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