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Aliases :

Worm:W32/Downadup.gen, Net-Worm.Win32.Kido, Win32.Worm.Downadup.Gen, Win32.Worm.DownadupINF.Gen, Worm:W32/Downadup.gen, Worm:W32/Downadup.gen!A


Worm:W32/Downadup.gen is a generic detection of Worm:W32/Downadup.

Security programs use generic detections that look for broad patterns of code or behavior to identify similar programs or files. If you suspect the file was incorrectly detected, go to: Removal: Suspect a file is incorrectly detected (a False Positive)?.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.


Downadup makes use of random extension names in order to avoid detection. During disinfection, Scanning Options should be set to:

  • Scan all files

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

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

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

  • Exclude a file from further scanning

    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.

Technical Details

For technical details of Downadup's installation and propagation mechanisms, see the following descriptions:


Downadup uses a variety of methods and vectors to spread itself:

  • Exploits a Windows vulnerability; patched by security update 958644 (read our Vulnerability Report, SA32326: Microsoft Windows Server Service Vulnerability).
  • Use of network shares; weak passwords.
  • It uses Windows AutoRun functionality; autorun.inf files are copied to USB drives and other removable media.

Certain Downadup variants have additional rooutines: