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Email-Worm:W32/Vote.D

Classification

Category: Malware

Type: Email-Worm

Aliases: Email-Worm:W32/Vote.D

Summary


This type of worm is embedded in an email attachment, and spreads using the infected computer's emailing networks.

Removal


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details


Email-Worm:W32/Vote.D is written in Visual Basic and propagates by sending itself to all recipients found in Outlook Address Book of an infected machine.

The worm disguises itself as pictures of the 2001 September 11 terrorist attacks and appears to be trying to remind and/or frighten users with the tragedy.

Propagation

The email messages sent by Vote.D have the following characteristics:

  • Subject: WORLD TRADE CENTER PICTURES
  • Body: Remember The Times.......MAYBE THEY WILL BE BACK....!!!
  • Attachment: WTC32.scr

Where the To: filed is the recipient's name.

The attachment is always named WTC32.scr. and is a PE executable file 61440 bytes long.

Installation

When a user runs the infected attachment, the worm copies itself to system with the following names:

  • c:\windows\notepad.exe
  • c:\Windows\WTC32.scr
  • c:\Autorun.com

Since the path "c:\Windows\" is hard-coded, Vote.D won't work if Windows is installed in a folder different from "c:\windows". After copying its files to a hard disk the worm creates a startup key for one of its files in the Registry:

  • [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\W32Tc] @ = "c:\Windows\WTC32.scr"

Vote.D can also create a lot of copies of itself with randomly-generated names in c:\Windows\Systm32\BkUp folder.

Activity

Once installed, the worm changes the startup page of Internet Explorer to point to the worm's file "c:\Windows\WTC32.scr". After performing its mass-mailing routine, the worm displays one or more message boxes with different messages, for example:

  • WORLD TRADE CENTER
  • WE WILL ALWAYS REMEMBER THOSE LOST SOULS...

Some of these messages are very insulting and contain bad language. The worm changes the Registered Owner and Registered Organization settings of Windows to:

  • YOU ARE A VICTIM OF THE
  • WORLD TRADE CENTER

And changes the Product Name setting of Windows to:

  • w32.hllp.I-Worm.WTC.03

The worm can play the "GUESS A NUMBER" game with a user of an infected computer. It asks:

  • "GUESS A NUMBER From 1 to 50"

and waits for the answer. If the answer is right, the worm displays "Alright!", otherwise it displays "Sorry !".

The worm's payload also includes dangerous routines. These are:

  • Deleting all DLL files in C:\Windows\System32\ folder.
  • Locating files with the following extensions - wav .mp3 .jpg .bmp .zip .rar .doc - and writing itself with the name of those files and an additional .exe extension. The original files are deleted.
  • Overwriting all .exe and .scr files with its body.