Tack Family
Description Tack Family
These are dangerous nonmemory resident parasitic viruses. They search for .COM files of the current directory and write themselves to the end of the file. The viruses infect the files in incorrect way: they overwrite first six bytes of the file beginning with Jmp-Virus instructions (MOV AX,offset Virus / JMP AX), but before return to the host program the viruses restore only five bytes of the code. These viruses display the message:
----------------- Hello, I am virus ! ------------
"Tack.449" contains the word "TACK".
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DM.330
Description DM.330
This is a harmless memory-resident virus. It hits by standard way COM files whenever it is loaded into the memory, opened, renamed or their attributes are changed. The virus writes its TSR copies into the interrupt vector table at the address 0000:0200. It hooks INT 21.
It contains the following texts:
(C)DM 1991 1.05 DM
DM.400.a
Description DM.400.a
This is a very dangerous memory-resident virus. It hits by standard way COM files whenever it is loaded into the memory. The virus writes its TSR copies into the interrupt vector table at the address 0000:0200. This virus on every 256th infection of a file tries to format a disk. It hooks INT 21.
It contains the following texts:
(C)DM 1990
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