MultiDropper-LA, Neblso.A, W32/MultiDropper-LA


Files detected as MultiDropper-LA drop already detected worms into the system's temporary files folder and execute them.

Automatic action

We have received four samples which, upon being executed, will drop two files into the system's temporary files folder. The dropped files are old malware, already detected by F-Secure Anti-Virus.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

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    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

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    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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Technical Details

All the variants we received drop two files. We now provide their filenames and current detection results.

  • %Temp%/document.txt .exe Infected: W32/NetSky.P@mm
  • %Temp%/your_details.exe Infected: I-Worm.Sobig.f
  • %Temp%/document.txt .exe Infected: W32/NetSky.P@mm
  • %Temp%/msblast.exe Infected: Worm.Win32.Lovesan.a
  • %Temp%/document.txt.jpg Infected: W32/NetSky.P@mm
  • %Temp%/ Not an executable
  • %Temp%/your_details.exe Infected: I-Worm.Sobig.f
  • %Temp%/msblast.exe Infected: Worm.Win32.Lovesan.a

Afterwards those files are run, triggering all the known effects produced by those worms.