Virus.MSWord.WallPaper

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Virus

Viruses replicate on the resources of the local machine. Unlike worms, viruses do not use network services to propagate or penetrate other computers. A copy of a virus will reach remote computers only if the infected object is, for some reason unrelated to the virus function, activated on another computer. For example: when infecting accessible disks, a virus penetrates a file located on a network resource a virus copies itself to a removable storage device or infects a file on a removable device a user sends an email with an infected attachment.

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Platform: MSWord

Microsoft Word (MS Word) is a popular word processor and part of Microsoft Office. Microsoft Word files have a .doc or .docx extension.

Description

Technical Details

This is an encrypted macro virus. It contains two original macros, but while infecting global macros area the AutoOpen macro is copied to four macros:

Documents    NORMAL.DOT
FilePrint -> FilePrint
autoOpen  -> autoOpen
ToolsMacro
FileTemplates
ToolsCustomize

The virus infects the documents on all calls that are listed above (opening or printing a file, entering menus File/Templates, Tools/Macro, Tools/Customize) and copies itself to global macros on opening an infected document.

The virus drops the SK2.BMP file that contains an image of a death's head.

On the 31th of any month the virus modifies the profile section [Desktop] (the WIN.INI file):

[Desktop]
Wallpaper=SK2.BMP
TileWallPaper=1
SK2=

and increases SK2 value on each infection. It also creates the C:WINDOWSREGSK2.REG and writes the text to there:

REGEDIT4
[HKEY_CURRENT_USERControl PanelDesktop]
"TileWallpaper"="1"
"Wallpaper"="C:\WINDOWS\SK2.BMP"

The virus then appends the following commands to the C:AUTOEXEC.BAT file :

@echo off
c:
cd c:windows
copy /y SK2.BMP c:windowssk2.bmp >nul
regedit regsk2.reg >nul

On the same date (31th) the virus, depending on the system time, displays the dialog:

[!!!PIRATE VIRUS!!!]-- Active!
The [PIRATE VIRUS] has pillaged your computer!
GO BACK TO MS-WORD??

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