There's a new version: The latest TDL-4 version of the rootkit, which is used as a persistent backdoor to install other types of malware, infected 4.52 million machines in the first three months of this year, according to a detailed technical analysis published Wednesday by antivirus firm Kaspersky Lab. Almost a third of the compromised machines were located in the United States. With successful attacks on US-based PCs fetching premium fees, those behind the infections likely earned $250,000 on that demographic alone. TDL-4 is endowed with an array of improvements over TDL-3 and previous versions of the rootkit, which is also known as Alureon or just TDL. As previously reported, it is now able to infect 64-bit versions of Windows by bypassing the OS's kernel mode code signing policy, which was designed to allow drivers to be installed only when they have been digitally signed by a trusted source. Its ability to create ad-hoc DHCP servers on networks also gives the latest version new propagation powers.
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Read more: Bruce Schneier
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