Ahh el viejo Melt

Creates the hidden file "MELT_2A" in the temp directory
Infects files in the current, parent and all path directories
Infects one batch per run if less than ten infected files encountered
After detecting ten infected files it displays a graphics screen effect
Adds one line before the host batch and appends the rest
Will not run if attached to AUTOEXEC.BAT (but infects it)
This batch virus is much more advanced. It takes control from the host
immediately, runs the virus then runs the host batch. The host is run in
such a way as to disable the virus until the host is completely finished
to avoid slowing down batch files that call themselves in a loop. Simple
appenders are very obvious when on such files, but this one causes no
significant speed loss except at startup. This virus carries a harmless
payload which is assembled with the debug command - it 'melts' the screen
in a flash of color then returns it to normal before running the host.