Threat Description

Veneno

Details

Aliases: Veneno, Veneno.A
Category: Malware
Type: Virus
Platform: W32

Summary



VM/Veneno is a Word macro virus that is able to replicate with the Spanish version of Word only. The virus has a destructive payload.

The virus infects the global template when an infected document is opened. During infection the virus removes checks for existence of several specially named macros. If these macros are found, it attempts to remove them.

After that the virus infects every document that is opened or saved.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



The first payload activates when the number of minutes is exactly 30. Then the virus creates two temporary files to the "C:\DOS" directory and uses these files to drop a binary virus Glupak.847.D to file "C:\DOS\ATTRIB.COM".

The second payload activates every Saturday and Sunday if the number of minutes is less than five. This time the virus inserts the following text to the active document:

  ** V>N>N0 **
		   

The virus also replaces all occurences of "ste " with "stes ", saves the document with password "Veneno" and closes it.

The third payload activates every time when the Word is restarted or a document is opened. At this point the virus will replace both "C:\CONFIG.SYS" and "C:\AUTOEXEC.BAT". This causes that when the system is restarted, the following message is displayed:

Insert a diskette in drive A:
 Press any key to continue...
 

The the virus will attempt to format the disk in the drive "A:". If this fails, the virus attempts to format both "C:" and "D:" drives.

When "Archivo/Imprimir" ("File/Print") or "Archivo/Imprimir Predeter" ("File/Print Preview") menu is selected and the number of seconds is greater than 57, the virus inserts the following lines to the end of the document:

Finalmente me gustaria agregar que...
 El Centro de Computo de esta Universidad es una verdadera verguenza,
 no nos merecemos este servicio.
 >>> Shame on you!!! <<<
 <eof>
 

Finally, when "Archive/Guardar Como" ("File/Save As") menu is selected and the number of seconds is exactly 38, the virus shows a message box with the following text:

Khelia Monica Salda Diaz, me encantas y te sigo buscando... Donde
  te has escondido?  Atte. Tu enamorado. (LoVe90/91)
  

Variant:Veneno.B

WM/Veneno.B is functionally identical with VM/Veneno.A.


Variant:Veneno.C

WM/Veneno.C is a corrupted variant with no payload except the message box with "Archive/Guardar Como" ("File/Save As") menu.


Variant:Veneno.D

WM/Veneno.D is a slightly modified variant of WM/Veneno.A.





Description Created: Analysis: Sami Rautiainen, F-Secure


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