Vis Family
Description Vis Family
These are dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the beginning or middle of COM files that are accessed by DOS functions FindFirst/Next ASCII. While executing a file DOS also calls FindFirst, so the viruses also affect the files that are executed. While infecting they partly encrypt the files. The viruses contain several bugs and may halt the system while infecting.
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Iper.1062
Description Iper.1062
It is a dangerous nonmemory resident parasitic virus. It searches for COM files that are started with JMP NEAR opcode (E9h), then writes itself to the end of the file. This virus is nonmemory resident, but it leaves in the memory a small resident program that hooks INT 13h and writes some data to the RS232 ports, and changes the keyboard flags. The virus contains the word:
IPER
IR&MJ
Description IR&MJ
It is a dangerous memory resident boot virus. It hooks INT 13h and writes itself to the MBR of the hard drive and to boot sector of the floppy disks. The virus uses not allowed program tricks and often halts the system. On December 30 the virus decrypts and displays the message:
December 30th (C) By IR&MJ Compu Serve 1993
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