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 is an encrypted Word macro virus. It contains ten macros: Killer, AutoExec, AutoOpen, DocClose, FileOpen, FileSave, AutoClose, FileSaveAs, ListMacros, ToolsMacro.

The virus replicated on opening an infected document, saving and saves with new name. The replication routine presents only in one macro Killer, other macros call it to spread the virus. The infection subroutine in the virus is named "MENTES".

The virus author leaves a possibility of self-destruction: if the MY.INI file exists in Windows directory, and it contains the section [Word Info] with the "Kod=aaa" string inside, the virus disables its infection routine and removes all its macros.

The virus is able to "steal" documents when they are saved. To do that the virus writes the C:LOGIN.SYS file name of closed document, current date, time and contents of the document. It then connects the \HS_WORKHCOMMONSTUDENTTEMP disk and moves to it the C:LOGIN.SYS file to the first logical drive that is write-enabled. The name of new file is ARCHIVE.A??, where '??' is number from "10" till "50". This file name is also saved to the PROG.INI file on the same disk.

On entering the List/Macros and Tools/Macro Word menus the virus displays the MessageBox and cancels execution of original macros viewing routines (stealth):

Macro function is not installed.

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