Yellow.1361
Description Yellow.1361
It is a memory resident dangerous virus. It hooks INT 8, 9, 21h and infects COM and EXE files that are executed. After 2000h-th call to INT 9 (keyboard) or depending on the system timer the virus displays a yellow square on the screen and halts the system.
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Jerusalem.Havoc.3072
Description Jerusalem.Havoc.3072
It is a harmless memory resident virus. It hooks INT 13h, 21h. It writes itself to the end of EXE files that are accessed by FindFirst/Next FCB, to the MBR of the hard drive while executing an infected file, and to boot sectors of the floppy disks that are accessed.
This virus is related to "Jerusalem" and "Havoc".
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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