Nr.300
Description Nr.300
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of .COM files that are executed. The beginning of infected files contain the text strings "Nr". Sometimes this virus overwrites CMOS memory.
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Permutan.544
Description Permutan.544
It is a very dangerous memory resident parasitic virus. It hooks INT 13h, 20h and stays memory resident. While installing into the memory the virus leaves in the system memory its own code as well as the code of host file.
On INT 20h calls (Terminate) the virus gets from PSP the file name of active program and writes itself to the end of the file.
Depending on the system timer the virus corrupts the data that is saved on disk (INT 13h). The virus contains the text string:
Permutan
Pers
Description Pers
It is a harmless memory resident boot virus. It hooks INT 13h and writes itself to the MBR sector of the hard drive and to boot sector of floppy drive A:. The virus infects the hard drive MBR on loading from infected floppy disk; floppy disks get infection on accessing to them.
The virus does not manifest itself in any way. It contains the text:
Pers?fone 1.1
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