Threat Description

Dementia

Details

Aliases:Dementia
Category:Malware
Type:Virus
Platform: W32

Summary



This is an unusual virus. It infects COM and EXE files normally, but is also able to infect ZIP files: virus inserts a file called CALLFAST.COM to any ZIP file when they are accessed. This file is a BBS advertisment for 'Dementia BBS' and is infected by the virus.

It seems that the virus has been written to faciliate stealing files from a BBS system. Virus checks any ZIP file for a file called REQUEST.IVA. If such a file is found, virus reads a filename list from this file, collects the files, encrypts them and adds them to the same ZIP file as file RECEIPT.IVA.

Dementia does not need external programs to modify ZIP files.

Dementia contains these texts:

Dementia
  Copyright 1993 Necrosoft enterprises  -  All rights reserved
  I am the man that walks alone
  And when I'm walking a dark road
  At night or strolling through the park
  When the light begins to change
  I sometimes feel a little strange
  A little anxious when it's dark


Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.








Description Created: Mikko Hypponen, F-Secure


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