Virus.MSOffice.Cybernet

Class Virus
Platform MSOffice
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:

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 #               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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