Virus.DOS.PZ is a very dangerous memory resident parasitic encrypted virus on DOS.

There are 2 variants:

  • Virus.DOS.PZ.826
  • Virus.DOS.PZ.955


When the virus is in memory, it infects any executable file that is run, and the infection size of EXE files is 17 bytes longer than that of COM.

Memory usageEdit

The following table shows the memory usage of the variants.

Variant Memory usage in bytes
PZ.826 1,664
PZ.955 1,920


The virus activates when any program is run on Friday 13th. It displays a screenful of message in black color with red background, erases disk sectors and hangs the system.


It displays the following:

I'm virus Johnny! Now your Hard disk is destroyed. You can restart the computer.


It displays the following:

I'm virus Angel! Now your Hard disk is destroyed. You can restart the computer.

Other detailsEdit

There are other 2 variants under this family:

  • Virus.DOS.PZ.Hanko.1444
  • Virus.DOS.PZ.Hanko.1531

The virus contains the internal text string:





PZ virus review by Alles Sandro



PZ virus review by danooct1

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