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

This virus contains four original macros that are copied with different names while infecting documents or NORMAL.DOT:

Documents                 NORMAL.DOT
AOSample, AutoOpen        AOSample
FSSample                  FSSample, FileSaveAs
FOSample                  FOSample, FileOpen
RVSample                  RemoveVaccine
The virus infects the global macros area on opening an infected document (AutoOpen). It infects documents that are opened (FileOpen) or saving with new name (FileSaveAs).

The virus searches and deletes macros that belong to the "Concept" macro virus. While saving templates with a new name the virus displays a DialogBox. This dialog contains items to select file format to save document (DOT, DOC, TXT). On pressing the "About" button the virus displays the text:

Read this information to settle your issue
It is possible to select one of the next Items:
1. "Document Templates(* .dot)"
2. "Word Documents(* .doc)"
3. "Text Files(* .txt)"
Selecting the first Item does not convert your Document to another format
and saves all Macroses there.
Consequently, this Document will keep your own Samles and also will
eradicate the Word infection in the future. That ability to remove such
infection will be spreaded to other computers. Template's documents alone
are capable to do it!
Selecting the next Items (2,3..) will convert your Template's Document to
the Simple Format as *.doc or *.txt
In this Case, it is necessary to remember, that any Samples and Macroses
kept by Template's Document will have been lost!
To remove this Word Vaccine it is necessary to run RemoveVaccine macros
from the ToolsMacro... menu!
RM of the WB, Bishkek, Fax:007(3312)620156, tel. 620157

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