Classification

Category: Malware

Type: Virus

Aliases: Cursy

Summary


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.

Removal


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

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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.

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