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A security researcher has identified a new attack that has infected almost 300,000 webpages with links that direct visitors to a potent cocktail of malicious exploits.

The SQL injection attacks started in late November and appear to be the work of a relatively new malware gang, said Mary Landesman, a researcher with ScanSafe, a web security firm recently acquired by Cisco Systems. Hacked sites contain an invisible iframe that silently redirects users to 318x .com (a space has been added to protect the clueless), which goes on to exploit known vulnerabilities in at least five applications.

People who visit infected pages receive an invisible link that pulls code from a series of sites tied to 318x .com. The code looks for insecure versions of Adobe Flash, Internet Explorer, and several other Microsoft applications, and when they are detected it exploits them to surreptitiously install malware known as Backdoor.Win3.Buzus.croo. The rootkit-enabled program logs banking credentials and may do other nefarious bidding, Landesman said.

At the moment, about two percent of the requests ScanSafe sees are for sites infected by the malicious link, an indication the threat is significant, Landesman said.

SQL injection attacks prey on web applications that fail to adequately inspect user supplied input before passing it off to a webserver's backend database. They are a favorite way of adding malicious links and content to third-party websites and were also the the chink that allowed Albert Gonzalez and other hackers the toehold they needed to steal more than 130 million credit card numbers from card processor Heartland Payment Systems and four other companies.

The fingerprints on this latest attack lead Landesman to believe the perpetrators are new to the SQL injection game. More sophisticated mass attacks using the method, such as the Gumblar infection inject unique, dynamically-generated links that prevent researchers from being able to locate them using web searches.

Gumblar also uploads exploits directly to infected sites, which greatly complicates white hat efforts to clean up the mess. Rather than shutting down a single site that's hosting the malware, thousands of mom and pop sites must be disinfected one at a time.

"I'm not convinced SQL injection is the method they're most accustomed to," Landesman said of the gang behind the most recent mass infection. "It's almost as if they're a seasoned attacker but this is their first foray into managing a wide-scale web attack." ®

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