Perilocity

Festi botnet in July 2012 U.S. Medical SpamRankings.net from CBL

The curve that took University of Pittsburgh Medical Center's AS 122 U-PGH-NET-AS to number one in the July 2012 U.S. SpamRankings.net from CBL data is almost completely explained by Festi botnet, except for one day, plus the small curve at the beginning of the month was apparently caused by Grum botnet.

AS 17311 ECMC-BGP was infested with Festi (blue curve on the right) at the same time as AS 122, and AS 17311 earlier had a Cutwail botnet

Pittsburgh back in the top 10 for spam from U.S. medical organizations

And this time it's #1 in the July 2012 U.S. SpamRankings.net from CBL data:

AS 122 U-PGH-NET-AS in the same ranking over time:

2011 Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	2012 Jan	Feb	Mar	Apr	May	Jun	Jul
34	32	32	8	31	8	4	29	32	33	30	32	29	6	5	9	1

University of Pittsburgh Medical Center's AS 122 U-PGH-NET-AS and Erie County Medical Center's AS 17311 ECMC-BGP not only took #1 and #2, they also spammed longer than other medical ASNs. That jumped them up 8 ranks each in one month.

-jsq