Cheese is a worm that is able to propagate from a Linux based system to another. It scans random Class B subnetworks for machines that are infected with a Lion worm, and if such systems are found, it copies itself to the victim to to directory "/tmp/.cheese".
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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When the worm executes, it removes all lines that contain string "/bin/sh" from the "/etc/inetd.conf" and restarts inetd service. This effectively removes an open shell installed by Lion worm.
After that Cheese will start to scan for other machines to infect.