Shake may infect the same program over and over, and infected programs may cause a reboot when executed. The name is derived from a string which is found inside the virus:
Shake well before use !
This message is occasionally displayed when an infected program is run, followed by termination of the program.
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.