In November 2010, the press reported that the rootkit had evolved to the point that it was bypassing the mandatory kernel-mode driver signing requirement of 64-bit editions of Windows 7. Microsoft subsequently modified the hotfix to prevent installation if an Alureon infection is present, The malware author(s) also fixed the bug in the code. The malware was using a hard-coded memory address in the kernel that changed after the installation of the hotfix.
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The malware drew considerable public attention when a software bug in its code caused some 32-bit Windows systems to crash upon installation of security update MS10-015. Google has taken steps to mitigate this for their users by scanning for malicious activity and warning users in the case of a positive detection.
Alureon has also been known to redirect search engines to commit click fraud. It also attempts to disable anti-virus software. Once installed, Alureon manipulates the Windows Registry to block access to Windows Task Manager, Windows Update, and the desktop.
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Then it infects low-level system drivers such as those responsible for PATA operations (atapi.sys) to install its rootkit. When the dropper is executed, it first hijacks the print spooler service (spoolsv.exe) to update the master boot record and execute a modified bootstrap routine. Alureon is known to have been bundled with the rogue security software, "Security Essentials 2010".
Personal computers are usually infected when users manually download and install Trojan software. The Alureon bootkit was first identified around 2007.
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