Threat Description

Pesan

Details

Aliases: Pesan
Category: Malware
Type:
Platform: W32

Summary



WordMacro/Pesan.A is a simple Word Macro virus.

It activates every five minutes and displays one of these messages:

MicroSoft Warning!!!
  You are about Formatting Hardisk, Are you sure?
  FORMAT WARNING !!!
  You have just activate the format.exe trigger,
  all command will FORMAT your hardisk
  SYSTEM DAMAGE WARNING !!!
  System detected 'Bandung.d_t' VIRUS, all system will be
  Damage Permanently !!! May God Have Mercy On you ....!!!

Otherwise Pesan.A only spreads.



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




Variant:Pesan.B

This is a later variant with destructive activation routine. The virus does not display any messages, but it attempts to delete the following files:

c:\dos\chkdsk.exe
        c:\dos\format.com
        c:\dos\defrag.exe
        c:\dos\scandisk.exe
        c:\msdos\chkdsk.exe
        c:\msdos\format.com
        c:\msdos\defrag.exe
        c:\msdos\scandisk.exe

After this Pesan.B creates a BAT file with the same name. When this batch file is executed, it will delete all files from drive C: with the deltree command.

The activation routine failes if there is no c:\dos or c:\msdos directory (most Windows 95 and NT systems do not have such directories).





Description Created: Mikko Hypponen, F-Secure


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