It is not a dangerous memory resident parasitic virus. It hooks INT 8, 21h and writes itself to the end of COM (except COMMAND.COM) and EXE files that are executed. After the virus has been resident for 30 minutes, it will play 1 of 8 tunes. After 7 minutes, the virus plays another tune at random, and every 7 minutes after this. The tunes are german folk songs.