Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
When Backdoor.CrashCool is executed, it performs the following actions:
Attempts to open and close the CD-ROM drive.
Listens for remote commands from the author on port 9898 and attempts to execute them.