Tiny.D, Tiny.D


Tiny.D, a variant of the Tiny family, has a very small amount of virus code. This variant of Tiny shows an annoying message that is triggered by certain conditions.

Automatic action

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.

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

    First check if your F-Secure security program is using the latest detection database 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.

For more Support


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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Tiny.D drops a copy of itself in the Windows System directory as follows:

  • %sysdir%\winalert.exe

As a part of Tiny.D's installation routine it adds the following registry entry to enable its automatic execution upon Windows boot up:

  • HKLM\Software\Microsoft\Windows\CurrentVersion\Run"Windows Update Notifier" = "%sysdir%\winalert.exe"

Tiny.D checks for the following mutex to ensure that only one instance of itself is running in memory:

  • "[Critical_Alert]"


If any of the following conditions is fulfilled a message will be pop up:

  • Day is greater than 20
  • Month is not November
  • Year is not 2006

Here is the screenshot of the message:

Tiny.D will continually check for the said condition every 10 seconds. But once a message as been shown it will pause for 1 hour before resuming its checking.

Tiny.D is encrypted using xor with 0x8C as its key.