Rasek

Threat description

Details

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

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

Contact Support

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"

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