Swine family
Description Swine family
These are memory resident encrypted parasitic viruses. They hook INT 21h, 2Fh and write themselves to the end of COM and EXE files that are accessed. The viruses contain the text string:
COMcomEXEexe
"Swine.3000.b" when executed at 13:05 displays a message in Russian and erases the MBR of the hard drive.
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Apo.2108
Description Apo.2108
It is a very dangerous memory resident encrypted parasitic virus. It hooks INT 21h and writes itself to the beginning of .COM and end of .EXE files that are executed. While infection of the files the virus renames them to the name X$X$$X$X.$X$, infects and then renames back to original name.
While infecting .EXE files the virus corrects several fields in EXE header: the virus increases the length of EXE header to cover original contents of the file. As a result the original file body is defined as EXE header, and while loading such file info the memory DOS loads only the virus body. Then the virus opens the host file, restores the fields in EXE header, executes host file, and then writes "infected" fields back to EXE header.
The virus also hooks INT 1Ch and some time after installation erases the disk sectors. The virus has the bugs, and in some cases halts the computer. The virus contains the encrypted text string:
ApoVir
Apocalipse.1685
Description Apocalipse.1685
It is a dangerous memory resident encrypted parasitic virus. It traces INT 13h, 21h, hooks INT 21h and writes itself to the end of COM and EXE files that are executed. While installing into the system memory it also infects the C:DOSMODE.COM file.
The virus writes the counter into hard drive sector and increases that counter each time the virus installs itself into the memory. After 100 installation the virus corrupts CMOS and MBR of the hard drive, and displays:
Apocalipse 2.0 por M.A.C.
Isto é um vírus - afaste-se do computador, sen¦o constipa-se !
Boa sorte nas reparaç_es - nada está perdidoall
Também, andavas a trabalhar demais - aproveita para descansar !
Lembra-te: coisas destas só ajudam a formar caracter - n¦o,
n¦o precisas de agradecer, é um prazer ajudar...
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