Trojan-Downloader.Win32.VB.aoff

Trojan-Downloader.Win32.VB.aoff Description

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.

Without drawing attention to itself, the new bootloader starts the computer into Linux or Unix software that deletes a common Brazilian bank-security plugin, while also eliminating the PC system’s built-in Microsoft security program, opening it up to further potential malware attacks. This dubious change takes place before the computer has even booted up; and worse, it automatically deletes itself and resets the original bootloader, so affected users have no idea their security has been compromised. All they’re aware of during this whole bait-and-switch is that the bootup is taking a little longer than usual, but the attack clarifies that with a fake message stating to be from Microsoft that says it is actually ‘removing malicious files’. You should run up-to-date and reliable anti-virus and anti-malware software on your PC to get rid of Trojan-Downloader.Win32.VB.aoff.

Trojan-Downloader.Win32.VB.aoff Automatic Detection Tool (Recommended)

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Technical Details

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.

The following files were created in the system: