F-Secure Virus Descriptions : Prague

NAME:	Prague
ALIAS:	Backtime
SIZE:	528
ORIGIN:	Hungary
TYPE:	Resident COM-files
REPAIR:	Yes

This virus was found in August 1991. It contains the texts 'Backtime' and turns the system timer to work backwards.

VARIANT: Blinker

Slightly shorter, only 512 bytes. Displays the following error messages occasionally:

               Bad command  error reading device CON
               Bad command  error writing device CON

VARIANT: Shaker

This variant is also 512 bytes, but it produces a very interesting "shaking" effect on the screen, when run, as the virus interferes with the video controller. This version contains the text "Shaker"

VARIANT: Pizza

ALIAS: Plastic Pizza

This 1236 bytes long variant carries a copy of the Michelangelo virus with itself, and will infect all clean hard drives it spots with it.