Virus.MSWord.Showoff

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

text (c) Michal A. Egler

This virus contains the following encrypted macros: Hayo, AutoOpen, Nomercy2, Organizer, ToolsMacro, FileTemplates.

On the 13th day of any month the virus creates the file C:WINDOWSSYSTEMNOMERCY.DLL. This file contains a debug script with the NoMercy.575 DOS parasitic virus dump code. By using this script the virus creates the virus dropper NOMERCY2.COM.
Next the virus deletes files:

C:*.BAT
C:*.SYS
C:WINDOWS*.GRP
C:WINDOWS*.DRV
C:WINDOWS*.DLL
C:WINDOWSSYSTEM*.DRV
C:WINDOWSSYSTEM*.DLL

It also inserts the following commands into the AUTOEXEC.BAT file to execute the virus dropper:

@echo off
nomercy2.com

After restarting the computer the virus code stays resident and infects each executed COM and EXE file.

The virus displays a UserDialog containing the text:

No Mercy II [Hell on WinWord], The Madness Continues.....
wall 
NoMercy II �1997 by CrazybitS
From the land of Smoking Vulcanoes and Gamelan Orchestras
This Macro Virus Was Released for follow his brother No Mercy

Sometimes the virus changes names of macros:

Nomercy       = AutoOpen
AutoClose     = Nomercy2
AutoExec      = Hayo
ToolsMacro    = ToolsMacro
Organizer     = Organizer
FileTemplates = FileTemplates

Sometimes the virus displays a UserDialog with the text:

No Mercy II Was Distrub !
Mmmmm.... you just lost your files !
Don't do it again !

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