Class
Virus
Platform
MSWord

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

It is a dangerous stealth macro virus. It contains ten macros in one module "TJ": AutoOpen, LAYLA, AutoExec, AutoExit, AutoClose, FileClose, ToolsMacro, ToolsCustomize, FileTemplates, ViewVBCode.

It infects the global macros area on opening an infected document (AutoOpen) and infects other documents on opening and closing (AutoOpen, AutoClose).

The virus turns off the Word virus protection (the VirusProtection option) and deletes "NewMacros" module that contains user defined macros. It also disables the Tools/Macro, Tools/Customize menus (stealth). On opening the Visual Basic editor the virus closes Word without saving changes in documents.

On 27th or 29th of any month on closing documents the virus runs its payload procedure. On opening Word at these days the virus displays in the status bar the text:

Excellent day... for me... :)

The payload procedure is also run on opening document at 27th or 29th second of minute. This procedure replaces all digits by text "Tj" or "Layla" depends on day of month. Also it replaces every 9th character in document by Aries sign.

On exiting Word the virus searches in subdirectories of "c:", "c:program files", "d:" and "e:" for files by wildcard "*d*r*w*.*" (looking for DrWeb anti-virus) and deletes all files in directories where suitable files were found. Then it searches for "*a*v*p*.*" and deletes "*.avc" and "*.key" files (AVP anti-virus databases and key file). As a result of quite scrappy wildcards the virus can delete many other files.

The virus also changes following information:

UserName = ""
UserInitials = "TJ_LAYLA"
UserAddress = ""

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