Threat Description



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


Most boot sector viruses hide by lowering the amount of RAM visible to the operating system and hiding in the free space they create. EDV is different. It searches for free RAM, starting at E800 and searching downwards. It is also unusual on one other way - on every timer tick it will check if ES or DS point to it - which is possibly the case if a virus-scanning program is running. In this case a HLT instruction is executed - which halts the computer.


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

Aside from this, the virus is fairly usual. It marks infected diskettes with a "EV" at the end of the boot sector and stores the original boot sector code in the last sector of the last track on 360K diskettes, just like the Yale virus.

One encrypted text string is stored inside the virus code:

That rings a bell,no ? from Cursy  


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