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thursley

In my experience this can be caused by a loadbalancer, for example not being able to route (properly) to servers in the pool or a difference in configuration/patch-level between them.
Re:The Heartbleed Bug on Tuesday April 08, 2014 @07:41AM (#7552741)
Snort IDS rules to detect abuse can be found here: http://blog.fox-it.com/2014/04/08/openssl-heartbleed-bug-liv...
Re:NBC.com hacked, serving up Citadel malware on Friday February 22, 2013 @03:34AM (#5263329)
Writeup of the network monitoring service that discovered the infection: http://blog.fox-it.com/2013/02/21/writeup-on-nbc-com-distrib...
This was/is an infamous modem vulnerability: http://www.securityspace.com/smysecure/catid.html?id=10020

It could force a modem to hangup and redial a number.

More technical details (pdf) on: http://www.crysys.hu/skywiper/skywiper.pdf

Although the naming differs it has been noted on several blogs that it is the same malware.