Crocodiles.1592
Description Crocodiles.1592
It is a very dangerous memory resident parasitic virus. While executing an infected program the virus searches for the COMSPEC string, and infects the command interpreter (COMMAND.COM). While executing an infected command interpreter the virus hooks INT 21h and then writes itself to the end of COM and EXE files (except SCAN.EXE) that are executed.
Depending on its generation the virus also hooks INT 8 (timer) and manifests itself with some sound effect. The virus also calls some other effects and erases the disk sectors, but that code is corrupted, and the computer halts. The virus contains the text string:
CROCODILES
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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.
ABCD.a
Description ABCD.a
It's a harmless boot virus. On loading from infected disk, it hooks INT 13h and writes itself into boot sectors of floppy disks. It infects the hard drive on loading from infected floppy. It uses the ID-word ABCDh.
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