Trojan-Downloader.Win32.VB.aoff is a Brazilian banking Trojan which pretends to be a Microsoft anti-malware program. Trojan-Downloader.Win32.VB.aoff targets Windows systems by removing built-in security applications and allows cybercriminals to steal banking credentials from affected computer users. Trojan-Downloader.Win32.VB.aoff affects ‘ntldr’, the default boot loader on Windows PCs. Trojan-Downloader.Win32.VB.aoff propagates as a link attached to emails. Once PC users click on the malicious link, Trojan-Downloader.Win32.VB.aoff downloads two malicious files from Amazon’s Web Services cloud. These files, named ‘xp-msantivirus’ and ‘xp-msclean’, worm their way onto the computer’s bootloader, a component that gets executed before the startup of the PC’s operating system. The aims of the malicious files, promoted as msantivirus and msclean, is to look like legitimate Microsoft anti-virus software and computer cleanup tools, but in reality, they are exactly the opposite.
When these malicious files attack the Microsoft ntldr bootloader, they substitute it with a new, malicious one, a version of GRUB, an open-source bootloader, which they adjust to perform their commands.
Trojan-Downloader.Win32.VB.aoff Automatic Detection Tool (Recommended)
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File System Modifications
Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.
Posted: December 8, 2011 | By SpywareRemove
Threat Level: 9/10
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Detection Count: 75