This is actualy set of very short dos viruses, like follows:

Supra version 1.0
  This is a spawning resident COM infector. No payload. Length 95 byte
Supra version 1.0b
  This is a spawning resident BAT infector. No payload. Length 147 byte.
Supra version 1.0p
  Not than does not differ from versions 1.0, only in this version there was is added small graphic effect. Add payload. Length 136 byte.
Supra version 1.1
  This is a memory resident BAT/COM infector. No payload. Length 172 byte.

ULTRAS, 8 september 1999

Download source code of Supras here