Jerusalem.MBR
Description Jerusalem.MBR
This is a memory resident very dangerous multipartite virus. It infects COM and EXE files (except COMMAND.COM) in the same way as the "Jerusalem" virus does. it also affects the MBR sector of the hard disk and writes itself just after the MBR.
While executing an infected file the virus infects the MBR only, and then returns to the host program. While loading from infected MBR the virus decreases the size of DOS memory, hooks INT 13h and waits for INT 21h address changing. Then the virus increases the DOS memory size and hooks INT 21h which is used for file infection.
Depending on its internal counter the virus erases the disk sectors. The virus contains the text "COMMAND.COM".
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Fdate1111.570.a
Description Fdate1111.570.a
This is a not memory-resident encrypted parasitic virus which searches for EXE files of the current directory and writes itself to their ends.
It contains the text "*.EXE".
It changes the date and time of creation of infected files to August, 17th, 1991, 2.08am (1111h) but doesn't manifest itself in any other way.
This virus can erase the MBR of hard drive depending on the system timer.
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:
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