Tiny.D

Classification

Malware

Trojan

W32

Tiny.D, Tiny.D

Summary

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.

Removal

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.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

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]"

Payload

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.