Spanz.639
Description Spanz.639
It is a harmless nonmemory resident parasitic virus. It searches for .COM files of the current directory, and the directories that are marked in PATH string, then it writes itself to the end of the file. It contains the text:
INFECTED! * SPANZ *
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NRead.1467
Description NRead.1467
This is a very dangerous memory resident parasitic virus. It hooks INT 8, 9, 13h, 21h, and 28h. The INT 21h hooking is used for file infection - the virus writes itself to the end of .COM files that are executed or opened. INT 2Fh hooking is used for a "Are you here?" call when the virus is installing itself memory resident. Other hooks summon a trigger routine that in February displays a message and deletes all files on the current disk. The message appears as follows:
Network Read CRC Error
Re-reading Packet
NSD.266
Description NSD.266
It is a dangerous nonmemory resident parasitic virus. It searches for .COM and C:COMMAND.COM files, then writes itself to the end of the file. Depending on the system timer it sets the graphic video mode (INT 10h, AX=0013h), displays the message and halts PC:
SYSTEM ERROR: DMA DENIED.
The virus also contains the text string:
c:command.com
*.com
NSD
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