This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.
This trojan-downloader is distributed as a file attachment to spam e-mails. The attached programs are typically labelled using legitimate-sounding document names, such as 'invoice', as a simple form of social engineering.
On execution of the attached file, the trojan-downloader will attempt to install itself onto the machine, then contact a remote server for additional files and/or instructions.