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.

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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.

Date Created: -

Date Last Modified: -