Since late 2006, phishers have used a technique known as "fast flux" to make the location of their scam sites a moving target.

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Though fast flux was originally developed by a Russian group of phishers in 2006, the tactic spread widely through the industry this past year.

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Fast flux takes advantage of an option built into the Web's architecture, which allows site owners to switch the Internet Protocol address of a site without changing its domain name.

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But cybercriminals using fast flux take advantage of the option to move the physical location of their malicious sites every few minutes, making them much harder to block or shut down.

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Fast flux, probably innovated by a Russian cybercriminal gang known as Rock Phish, automatically changes the physical computer hosting a site as quickly as every two minutes, says Laura Mather, the APWG's director of operations.

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This year saw the widespread adoption of a tactic for hiding malware delivery sites known as "fast flux, " says Laura Mather, a researcher at the Anti-Phishing Working Group committee and a senior scientist with digital brand protection firm MarkMonitor.

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Many organizations use a fast-flux network of shells, making it harder to track malicious Web traffic to its source.

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"The law is in a state of flux and the argument I hear most often is that new technology is moving so fast that old laws are being crushed by the onslaught, " she says.

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