Class
Virus
Platform
MSOffice

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: MSOffice

Microsoft Office is a multiplatform suite of productivity applications published by Microsoft. Office applications are compatible with many types of files and content.

Description

Technical Details

This is an MS Office97/2000 macro-virus. It targets two Office applications: Word and Excel, and infects Word documents and Excel sheets. The virus also spreads by e-mail messages via the Internet using MS Outlook 98/2000.

So, the virus spreads in infected Word documents, Excel sheets, as well as mails itself by creating infected e-mail messages.

The virus has a dangerous payload routine that triggers on August 17 and on December 25 (see below).

The virus contains the "copyright" text:

W97M/CyberNET (C)2000 - Indonesia By AnomOke!
I'm NOT Responsible For Any Damage That Posible Cause By My Virus...!!!

Spreading in Word and Excel

The virus code in Word documents and Excel sheets is the same set of macros, one of them are auto-macros in Word (Document_Open), and the two other ones are auto-macros in Excel (Wordbook_Open, Workbook_Deactivate), and the other macros contain common virus code.

The virus auto-macros are automatically activated either upon document opening (Document_Open) or on selecting another Excel book (Workbook_Deactivate).

Upon being activated, the virus disables macro-virus protection in Word and Excel. The virus then calls an e-mail spreading routine, MS Office files infection and payload routines.

To infect Word documents, the virus copies itself to a NORMAL template (NORMAL.DOT), and then infects documents that are opened and closed. To infect Excel files, the virus copies its code to opened workbooks.

To infect Excel from a Word document, the virus creates an infected workbook with the CYBERNET.XLS name in the Excel start-up directory. To migrate from Excel to Word, the virus infects the NORMAL.DOT template.

The virus then deletes all ".XL?" files in the Excel start-up directory, as well as .DO? files in the Word startup directory.

E-mail spreading routine

To spread its copies over the Internet, the virus opens MS Outlook, gets access to the Address Book, gets all addresses from there and sends messages with its attached copy to the first 50 recipients from each address list (the same as the "Melissa" virus does).

The virus sends infected e-mails with an infected MS Word document or MS Excel workbook in an attachment. The message has:

Subject: You've GOT Mail !!!
Body: Please, saved the document after you read and don't show to anyone
else. The document is also VIRUS FREE...so DISREGARD the virus
protection warning !!!

The attached file name may be different, because the virus attaches an active document regardless of its name. Then the virus creates a mark in the system registry to prevent duplicate messages being sent from the same computer.

Payload

Depending on the infected application, the routine produces different visual effects:

In MS Word: it creates in active document up to 70 different shapes with random colors, size and position.
In MS Excel: it creates in active workbook 30 comments (they looks like tooltips to cells) with different size and text "(C)2000 - CyberNET From Indonesia" in each of them.

After this, the payload routine overwrites "AUTOEXEC.BAT" and "CONFIG.SYS" files. In the "AUTOEXEC.BAT" file, it writes a command that displays a message on the screen during computer boot-up and deletes all data on disk "C:". In the "CONFIG.SYS" file, it writes commands that disable "Ctrl-C" keystroke.

The virus then reboots the computer.

The message displayed by the virus during bootup is:

 ###############################################################################



 #                                                                             #



 #               Vine...Vide...Vice...Moslem Power Never End...                #



 # I'm Really Sorry, This System Have Been Recycled By -= CyberNET =- Virus!!! #



 #                     Brought To You From INDONESIA...                        #



 #                                                                             #



 ###############################################################################



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