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".
