Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Defo

Defo is a stealth boot virus. When it is installed into memory it attacks the hard disk’s MBR and takes over the interrupts INT 5, INT 8 and INT 13h service. It attacks boot sector of diskettes inserted in the drive. At installation into memory the virus calculates its CRC. In case its code was changed or an error occurred, the virus displays one of the following texts:

Runtime error 504D:5658
Invalid partition table
Error loading operating system
Missing operating system

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