A new report shows that spammers are buying dozens of domains at a time and moving from one to another as often as several times a day to prevent shutdowns. Spammers for years have been buying domains in bulk and using them for redirections to other, often malicious, sites. New research by security firm M86 Security Labs shows that the amount of time that a spammer uses a given domain is basically a day or less. Spam continues to be a major mechanism for spreading malware and is also a key piece of the botnet puzzle.
Source: https://threatpost.com/spammers-moving-disposable-domains-071410/74209/