Olga.483
Description Olga.483
It is a dangerous memory resident multipartite virus. It writes itself to the MBR of the hard drive and into the header of EXE files, if there is free space. When an infected file is executed, the virus infects the MBR and returns to the host program. While loading from infected MBR the virus hooks INT 13h and then infects EXE headers that are accessed. On December 27 the virus erases the disk sectors. The virus contains the text string:
SGB:Olga++
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Shaker.409
Description Shaker.409
This is a benign memory resident parasitic infector. It hooks INT 21h, and infects COM files that are executed. On Fridays, it also hooks INT 1Ch, and from 11:00 until 11:20, 'shakes' the screen.
Shaman.251
Description Shaman.251
This is a harmless nonmemory resident parasitic virus. It searches, then writes itself to the beginning of .COM files of the current directory. The body of the virus contains the number of the generation of the virus. If this number is greater than 6, the virus displays the string:
DemoVirus v1.0 Copyright (c) 20.8.1991 by Shaman
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