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
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
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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