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Category: Malware

Type: Virus

Aliases: Purcyst


This is a boot virus. One unusual feature of this virus is that it infects both MBR and DBR on hard drives.

This virus also modified the CMOS settings of the machine in order to spoof a clean boot. Check that your drive A: settings are correct in CMOS Setup before booting clean and disinfecting the virus.

The code of the virus contains this text:


Otherwise the virus only spreads.


Automatic action

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

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

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Submit a sample

Submit a file or URL for further analysis.