Once installed on a system, Backdoor:OSX/XSLCmd wait for instructions from a remote server and execute them on the infected machine.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
Backdoor:OSX/XSLCmd appears to share a significant amount of code with the XSLCmd backdoor previously known to target Windows systems, possibly indicating that the backdoor's authors have expanded their targets to include the rival operating system.
Once installed, possible actions carried out by the backdoor include installing other programs, steaking files, logging keystrokes, capturing screenshots and updating its own configuration. Captured information is forwarded to a remote server.