This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
Indication of Infection
Each time an infected file is executed, the virus displays the following message and returns the user to the DOS prompt:
"The Jasmine Virus is loose, better protect your computer.Beware!
There now it works! [JD]"
In addition to the text string indicated above as the virus' message, the following additional text strings are found within the viral code in all infected files:
"Admiral Bailey [YAM]"
Files infected with the Jasmine virus have the first 269 bytes overwritten with the Jasmine viral code, thus permanently corrupting the file. The file's date and time in the DOS disk directory listing are updated to the current system date and time of infection.
Methods of Infection
The only way to infect a computer with a file infecting virus is to execute an infected file on the computer. The infected file may come from a multitude of sources including: floppy diskettes, downloads through an online service, network, etc. Once the infected file is executed, the virus may activate.