ProtoVirus Family
Description ProtoVirus Family
These are not dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the end of .COM files that are executed. The viruses contain the text string:
** ProtoVirus v1.0 by Chr'92 **
and check it while installing into the system memory. If that string is altered, the viruses halt the computer.
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LZR
Description LZR
It's a dangerous memory resident boot virus. On loading from infected floppy it writes itself in MBR of hard drive. Then it hooks INT 13h (as on loading from infected MBR) and hits boot sectors of floppies. In some cases it erases disk sectors. It contains the internal text string "LZR" also.
M.534
Description M.534
It is a dangerous memory resident parasitic virus. It does work only under old DOS versions (DOS 3.30 and other), but does not check the DOS version. When an infected file is executed, the virus hooks INT 21h and then writes itself to the end of EXE files that are opened.
The virus corrupts the files with the length greater than 64K. In some cases the virus also corrupts the EXE header fields. While infecting a file the virus patches the INT 24h handler and does not restores it after infection. When infecting a file the virus also displays the 'M' letter to the left top corner on the screen.
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