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Class | Virus |
Platform | MSOffice |
Description |
Technical DetailsThis 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:
Spreading in Word and ExcelThe 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 routineTo 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:
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. PayloadDepending 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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