Threat Description

Rasek

Details

Category: Malware
Platform: W32
Aliases: Rasek, Coruna

Summary


This Spanish multi-partite virus infects COM and EXE files and the master boot sectors on hard drives.

Rasek stays resident in memory and infects all executed COM and EXE files. It doesn't infect very small files. The virus decreases the amount of free memory by 2 kilobytes.



Removal


Automatic action

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

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


There are three known variants:

Rasek.1489: - Length: 1489 bytes - Checks if already resident by calling INT 21/CAFE. If result is

CACA, the virus has been installed.  

- Contains text "RaseK v2.1,from LA CORUNA(SPAIN).Mar93"

Rasek.1490: - Lenght: 1490 bytes - Checks if already resident by calling INT 13/DFDF. If result is

FDFD, the virus has been installed.  

- Contains text "RaseK v2.0,from LA CORUNA(SPAIN).Mar93"

Rasek.1492: - Lenght: 1492 bytes - Checks if already resident by calling INT 21/CAFE. If result is

CACA, the virus has been installed.  

- Contains text "RaseK(r) v3.1,from La Coruna(SPAIN).Ap93"





Description Details: Mikko Hypponen, F-Secure


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