ABC.2378
Description ABC.2378
It is very dangerous memory resident virus. It infects COM- and EXE-files while DOS accesses them. The virus manifests itself from 13th of every month: it checks keyboard and after double pressing of any key duplicates this key (for example the keyboard input "1001" is transferred to "10001"). The infector writes a small program into files that tries to erase the FAT of all hard disks after starting. The virus hooks INT 16h, 1Ch, 21h.
The virus uses very powerful algorithm of en/decryption. The en/decryptor contains much of the assembler commands ADD, SUB, XOR in random order.
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Svin.Boot
Description Svin.Boot
It is not a dangerous memory resident boot virus. While loading from infected floppy disk the virus infects the MBR of the hard drive, then it returns control to the host sector and does not stay memory resident. While loading from infected MBR the virus hooks INT 13h and then infects boot sector of floppy disks. In some cases the virus decrypts and displays the message:
< SVINOLOBOVA SYKA >S0_MBR (C) 04.1994 by @SOURCE
Svir.512
Description Svir.512
This is a harmless nonmemory resident parasitic virus. It searches for .EXE files of the directories that are listed in PATH string, then writes itself to the end of the file. The virus contains the texts: "a:*.*", "*.EXE".
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