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 Tuesday, January 15, 2008

The Storm Worm botnet, using its huge collection of infected computers, is now sending out phishing emails directing people to fake banking sites that it also hosts on the computers it remotely controls, according to F-Secure and Trend Micro. Apparently, Storm has never been involved in phishing up to this point, however, the new campaign may indicate, according to F-Secure, that Storm's controllers have figured out how to divide the massive army into clusters which it is now renting out to others. F-Secure and Trend Micro both reported that the phishing scam was using a technique known as fast-flux DNS to keep the phishing site alive. Fast-flux works by constantly changing the IP address in the internet's phone book system (known as DNS) and having multiple computers in the botnet host the phishing site. This makes it very difficult to blacklist a IP address and since the site isn't being hosted by a company that researchers could contact to take down the site, the site lives longer.

According to Paul Ferguson, an advanced threat researcher for security giant Trend Micro, the spam emails were sent from a different segment of the botnet than the phishing sites were hosted. The site used for phishing was just registered on Monday. Anti-phishing filters, such as the ones bundled into Opera, Firefox and IE7, have gotten pretty good at quickly adding sites to their blocked list, however, "the issue becomes how do you work to take it down and find the perpetrators," said Ferguson.

Read Ferguson's article on this incident on Trend Micro's Malware Blog.
Read the full article on Wired Blog Network.