Reverse stays resident in memory and infects COM and EXE files when they are accessed.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Reverese is encrypted with a variable key. The body of the virus contains two filenames written backwards:
COMMAND.COM is infected by overwriting a block of zeroes inside it. NCMAIN.EXE is not infected at all.
Reverse contains the following text, which is not displayed:
Reverse-948 Created by Renata G. from Lubin City in Sept 1993
Similar and also 948 bytes, but contains this text:
Red Spider Virus created by Garfield from Zielona Gora in Feb 1993
Description Created: Mikko Hypponen, F-Secure