Don't laugh. According to a post on Symantec's Security Response, the new trojan called OSX.Loosemaque presents itself as a video game while secretly deleting files from the player's home directory. It arrives as a Mac OS file named "lose lose.app" and 3,691,880 bytes (3.5 MB) in size. When a user is tricked into running the trojan, the user is presented with a video game: If the player shoots an enemy character, a file or folder is deleted from the player's home directory. When the player's character is destroyed, the trojan sends the high score to a remote server and then deletes itself from the computer. Symantec recommend the following practices, among others, regarding this trojan: Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world. Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised. Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application. Sensible, but irrelevant. Symantec recommend the following steps to remove this specific trojan: Update the virus definitions. Run a full system scan and repair or delete all the files detected. This is interesting because, according to the write-up, this trojan won't be detected by the weekly virus definition updates until tomorrow, November 4th. Now you can laugh.