These are harmless memory resident parasitic viruses. They hook INT 21h and write themselves to the end of COM and EXE files (except COMMAND.COM and AIDSTEST.EXE) that are accessed. Before and after infecting a file the viruses write to the end of the file the data of random selected length (from 0 till 255 bytes). The viruses infect the same EXE file two and more times. The viruses contain the text strings:
COMMAND.COM AIDSTEST.EXE .COM .EXE
"Raving_II.1195" also contains:
It's a beautiful life!
Can't stop raving
