A new attack on MySpace users in June was turning their sites into bots to serve phishing scams and viruses. This new technique (called fast-flux) was used to hide malicious sites behind constantly changing network of proxy servers that make it almost impossible to track down the malicious sites
http://www.eweek.com/article2/0%2C1895%2C2163609%2C00.asp
[Editor's note (Valle): This technique is similar to anti-forensic methods use by cybercriminals to hide their true origins. The main difference is that fast-flux has a larger and more rapidly changing number of proxy servers to hide behind.]
