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: IRC-Worm

This type of worm spreads via Internet Relay Chat. Like email worms, IRC Worms have two ways of spreading via IRC channels. The first involves sending an URL which leads to a copy of the worm. The second technique is to send an infected file to an IRC channel user. However, the recipient of the infected file has to accept the file, save it to disk, and open (launch) it.

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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 worm spreads via IRC channels and infects MS Word documents. The virus itself is a Word document containing a macro named Mumps.


When opened, the file will:

  • attempt to disable the Security menu in the Macro menu
  • disable the ban on activating macros in the Windows system registry
  • create a file named Mumps.drv in C:Windows directory and writes the code of the macro to this file. This file is then used to infect all open Word documents
  • save the active document to the hard drive under the following names:
  •  C:WindowsFAQ.doc
     C:Program FilesMicrosoft
  • commences propagation via IRC.

Propagation via IRC

The worm modifies a file named script.ini file. This means the file C:WindowsFAQ.doc will automatically be sent to all users of the channel used by the infected computer.

Signs of infection

When the user tries to open the HelpAbout menu, the worm changes the background colour of the document to dark blue. Letters will appear in white. It also open notepad.exe displaying the following text:

 "Windows has low memory resources. Please restart your Windows....."

If the user tries to print the current document and the system clock is showing 59 seconds, a Message Box with the following text will be displayed:

 "Your printer driver is not compatible with Windows. Please install another printer drivers."
If the user tries to view the code of the Macros or open the ToolsMacro menu, a Message Box with the following text will be displayed:

 "There is something a trouble with this function..."


The worm attempts to register C:WindowsFAQ.doc in the system registry as the default signature for Microsoft Outlook 5.0. The file will then automatically be added to all outgoing mail.

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