Threat Description

Urkel

Details

Aliases: Urkel, NWait
Category: Malware
Type: Virus
Platform: W32

Summary



This virus infects the Master Boot Records of hard disks and the DOS boot records of diskettes. It spreads only through diskettes.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Urkel does not let the original partition table remain in its proper place in the Master Boot Record, as most other MBR viruses do. This causes the hard disk to be inaccesible after a floppy boot, since the operating system cannot find valid partition data in the Master Boot Record - attempts to use the hard disk result in the DOS error message "Invalid drive specification".

When the computer is booted from the hard disk, the virus is executed first, and the hard disk can thereafter be used normally. The virus is not, therefore, easily noticeable, unless the computer is booted from a diskette.

Do not use FDISK /MBR to clean Urkel: you will loose all your data.

Note: When disinfecting Urkel with F-PROT after a floppy boot, use the command F-PROT /HARD /DISINF instead of using F-PROT C:, or just run F-PROT in interactive mode and scan 'Hard disk' with disinfection option on. After disinfection, error message 'No hard disk found' is normal: just reboot after the disinfection is done and you should see your hard drive again.

Urkel virus sometimes displays text 'Urkel' on screen.






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