Int12.818
Description Int12.818
It is a harmless nonmemory resident parasitic virus. It searches for .EXE files and writes itself to the end of the file. Then the virus writes the data of random length to the end of the file, so the file length grows by random value when infected.
The virus gets the address of INT 12h, stores it and sets the INT 21h handles to INT 12h address. While infecting this virus calls to INT 12h instead of INT 21h.
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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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