This virus only infects files when the DIR command is given, hence the name. The virus has not been fully analysed, but it appears not to contain any destructive code.
This virus is not directly related to the famous DIR-II virus.
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.