The following instructions have been created to help you to get rid of "Win32.Rungbu.a" manually.
Use this guide at your own risk; software should usually be better suited to remove malware, since it is able to look deeper.

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Threat Details:

  • trojan

Win32.Rungbu.a copies an executable file into the system directory and starts itself in autorun as "kava" without giving the user a possibility to cancel that process. It also connects to the internet in background and downloads executable files from a malicious server.
Removal Instructions:


Please use Spybot-S&D, RunAlyzer or msconfig.exe to remove the following autorun entries.
  • Entries named "kava" and pointing to "<$SYSDIR>\*.exe".


Please use Windows Explorer or another file manager of your choice to locate and delete these files.
  • The file at "c:\autorun.inf".
  • The file at "<$SYSDRIVE>\autorun.inf".
Make sure you set your file manager to display hidden and system files. If Win32.Rungbu.a uses rootkit technologies, use our RootAlyzer or our Total Commander anti-rootkit plugins.
You will have to use a global search for files without a name specified. Be extra careful, because just the name might not be enough to identify files!

Important: There are more files that cannot be safely described in simple words. Please use Spybot-S&D to remove them.


You can use regedit.exe (included in Windows) to locate and delete these registry entries.
  • Delete the registry key "MADOWN" at "HKEY_CLASSES_ROOT\CLSID\".
If Win32.Rungbu.a uses rootkit technologies, use our RegAlyzer, RootAlyzer or our Total Commander anti-rootkit plugins.

Final Words:

If neither Spybot-S&D nor self help did resolve the issue or you would prefer one on one help,
  1. Please read these instructions before requesting assistance,
  2. Then start your own thread in the Malware Removal Forum where a volunteer analyst will advise you as soon as available.