Threat Encyclopedia

Selected viruses, spyware, and other threats: sorted alphabetically

Parity Boot

Parity Boot is a stealth boot virus. When the computer system is booted from an infected diskette the virus decreases the amount of memory usable by DOS by 1 KB and installs itself into the memory. It overtakes the interrupts INT 13h (disk operations) and INT 9 (keyboard interrupt). The virus infects boot sectors of all not write-protected diskettes and MBR of hard disks. When an attempt is made to read infected boot sectors or MBR, no alternations caused by the virus are seen. When keys CTRL, ALT and DEL are struck at the same time the virus simulates system restart. Occasionally it presents itself by displaying the following message on the screen:

PARITY CHECK

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