Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.
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.
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.
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