Gumblar attack worse than Conficker, experts warn

The Gumblar attack started in March with websites being compromised and attack code hidden on them. Originally, the malware downloaded onto computers accessing those sites came from the gumblar.cn domain, a Chinese domain associated with Russian and Latvian IP addresses that were delivering code from servers in the UK, ScanSafe said last week.

As website operators cleaned up their sites, the attackers replaced the original malicious code with dynamically generated and obfuscated JavaScript, making it difficult for security tools to identify. The scripts attempt to exploit vulnerabilities in Adobe's Acrobat Reader and Flash Player to deliver code that injects malicious search results when a user searches Google on Internet Explorer, as well as search the victim's system for FTP credentials that can be used to compromise additional websites.
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