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VirTool:INF/Autorun.gen!AE

First posted on 14 July 2012.
Source: Microsoft

Aliases :

VirTool:INF/Autorun.gen!AE is also known as Mal/AutoInf-DD (Sophos), Trojan.AutorunINF.AY (BitDefender), Trojan.AutorunINF (Ikarus).

Explanation :

VirTool:INF/Autorun.gen!AE is a generic detection for autorun.inf files that may be used by variants of the Win32/Vobfus family of worms when spreading to local, network or removable drives.

Worms of the Win32/Vobfus family download and run arbitrary files and the downloaded files may include additional malware.



Installation

When copying themselves to one of your drives, some variants of the Win32/Vobfus family may create a file named autorun.inf, detected as VirTool:INF/Autorun.gen!AE, which contains instructions for your computer's operating system. These instructions are designed to load the Vobfus worm when you access a drive.



Payload

The autorun.inf file will change the default opening behaviour of the drive - so that instead of just opening the drive to look at the files inside, you will inadvertently tell the drive to run (much like what happens when you insert a CD into your computer and it automatically starts to install a program).

When the drive runs, it loads the Vobfus worm.

Additional information

It should be noted that autorun.inf files on their own are not necessarily a sign of infection, as they are used by legitimate programs and installation media.

The VirTool:INF/Autorun.gen!AE detection may be related to Worm:Win32/Vobfus.EQ. For more information, see the Worm:Win32/Vobfus.EQ entry.

Related encyclopedia entries

Win32/Vobfus

Worm:Win32/Vobfus.EQ



Analysis by Edgardo Diaz

Last update 14 July 2012

 

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