1. Kaspersky Lab Discovers Koobface Worm Doubles its Number of Command and Control Servers in 48 Hours http://www.kaspersky.co.uk/news?id=207576049
2. ‘What we know (and learned) from the Waledac takedown’, Microsoft Malware Protection Center, Threat Research & Response Blog http://blogs.technet.com/mmpc/archive/2010/03/15/what-we-know-and-learned-from-the-waledac-take-down.aspx
3. ‘ZeuS: A Persistent Criminal Enterprise’, Trend Micro, March 2010 http://us.trendmicro.com/imperia/md/content/us/trendwatch/researchandanalysis/zeusapersistentcriminalenterprise.pdf
4. See the ZeuS tracker at abuse.ch https://zeustracker.abuse.ch/statistic.php