It's a dangerous memory resident parasitic virus. It leaves itself in system memory together with the infected COMMAND.COM, hooks INT 21h and writes itself at the end of COMMAND.COM files of different drives on execution or opening the files or on DOS command GetDiskSize (AH=36h). Depending on the system time it erases disk sectors and displays the message:
---- C h i n e s e B o m b ----
( Made in China 1989 )
It also contains the internal text strings:
a:command.com B:command.com C:command.com D:command.com command.com
