Sandrine, a simple companion virus, spread through a file called 486up.com which was supposed to improve a 486's performance by 20 to 30%. Instead, it contained a simple 445 bytes long companion virus.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Sandrine took advantage of the fact that the DOS EXEC loader executes a COM file before executing a similarly named EXE file if both files are found in the same directory. Sandrine virus has an activation routine, during which it creates a file called SANDRINE.COM. This file contains the text:
Sandrine Baillieux thoughts of you are in my mind (c) 1994 by BrokenHeart
It seems that BrokenHeart was twice unlucky: Sandrine was detected by a F-Secure anti-virus scanner in heuristic mode.