Worm:W32/Downaduprun.A

Threat description

Details

Category: Malware
Type: Worm
Platform: W32

Summary

Worm:W32/Downaduprun.A is Generic Detection of the malicious autorun files created by Worm:W32/Downadup, which exploit the Windows Autorun functionality to spread the worm.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details

Typical Autorun.inf files are very small in size. The Downadup worm inflates the size of its autorun.inf in an attempt to avoid detection by antivirus signature scanners. Binary characters are used to inflate the file size. These binary characters are ignored by the Windows operating system.

Execution

On execution of the file, Windows runs the bloated file and finds the following command buried in the garbage text:

  • Open=RUNDLL32.EXE .\RECYCLER\jwgvsq.vmx

This command executes a DLL called jwgvsq.vmx from a hidden folder on the removable drive containing the malicious autorun.inf.

Note

This malware is discussed in the following Labs Weblog post:





Description Created: 2009-01-20 10:51:34.0

Description Last Modified: 2010-09-29 09:53:51.0


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