Grozny.999
Description Grozny.999
It's a not dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM- and EXE-files that are executed. It writes at the end of the file a block of random data of random length before infection, so the length of the file is grown on random value on infection. This virus contains and displays a text in Russian.
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Fear.1823
Description Fear.1823
It's a memory resident encrypted parasitic virus. It hooks INT 21h (for infection) and INT 2Fh (for "Are you here?" call). It writes itself to the end of .COM-files on their execution. The files can be encrypted wrong, they hang up the computer and are not recovered. Sometimes it formats the HD sectors and displays:
February12.1167
Description February12.1167
It is a possibly dangerous (see below) memory resident parasitic virus. While installing memory resident it traces INT 13h, 21h, then patches DOS kernel to hook INT 21h. The virus then writes itself to the end of COM and EXE files that are executed. On February 12th the virus disables keyboard and accurately reads all hard drive sectors. It seems that this is a debug version of the virus, and the "final release" will have WriteDisk calls instead of ReadDisk.
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