There are 3 variants:
When the virus is run, it infect every DOS executable by writing itself to the end of the file. When an infected program is run after that, the virus activates.
After infection the virus clears the screen and displays the message:
Ich bin ein Geschenk von dem Teufel
Translation (from German):
I am a gift from the devil
When an infected program is run, it displays an ASCII picture of red beast holding a text message accompanied with an extremely high pitched tune:
-= A B O M i N O G =-
And then it erases the drive sectors.