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.


Technical Details

It is a stealth macro-virus. It contains twenty procedures in one module "VrTechnoCode": VrInstall, AutoOpen, AutoExec, FileOpen, FileNew, FileNewDefault, FileSaveAs, FileSave, FileClose, DocClose, ViewVBCode, ToolsMacro, FileTemplates, ToolsOptions, VrStealth, IsChance, FilePrint, FilePrintDefault, AddOemInfo, CreateImageScreen.

The virus infects the global macros area on opening an infected document and infects other documents on opening, creating and saving. On closing a document, the virus sets the document protection type to wdAllowOnlyFormFields that denies any changes in the document text except form fields. On opening infected documents, the virus unprotects them, and on closing, protects them again. As a result, after disinfection, documents will stay protected. This protection may be removed manually by choosing the menu Tools/Unprotect, password is "Elite".

The virus turns off the Word virus protection (the VirusProtection option). The virus' stealth routine intercepts and prevents the opening of Visual Basic Editor, Tools/Macro and File/Templates dialogue boxes. With a probability of one in five, this routine displays MS Office Assistent with the message:

VR ���������� v1.0
Word Macro �����!!!
���� ��� ��  c 1999

The virus infecting routine, with probability of one in nine, creates, in the "C:WindowsSystem" directory, the "oeminfo.ini" file with the text:

Manufacturer=���� ��� ��
Model=MS Word �����
[Support Information]
Line1=��������� ������� �������: VrTechno V1.1
Line3=Word Macro Virus
Line4=John Great, ���� ��� �� - (C) '1999

With probability five percents the infection procedure inserts into documents a graphic shapes with text:

Microsoft Word Macro Virus
- Word 7.0                                        Version 1.1
- Stealth Technology
- Infect Documents and Templates
Copyright by John Great from Russia Far East, Khabarovsk'1999

The virus contains another payload routine - on printing the virus with probability 20 percents sends to printer the content of the "Autoexec.bat" file instead of active document.

The virus code contains comment:

'  VR ���������� v1.1 by John Great from Russia (C)'99  '


This is the next generation of the virus. There are several minor changes in the code. The password for infected documents in this virus version has been changed to "Mirochka".

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