Trojan:OSX/Loosemaque.A

Classification

Malware

Trojan

OSX

Trojan:OSX/Loosemaque.A

Summary

Trojan:OSX/Loosemaque.A appears to be a video game, but deletes files from the user home folder when a user plays it.

Removal

Automatic action

The F-Secure security product will automatically remove the file.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

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    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

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    Note You need administrative rights to change the settings.

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Technical Details

This malware is notable not only for being one of a relatively small handful of malware on one of the Macintosh platforms, it is also the only such trojan so far to use a game as its payload.

It is also unusual in that its developer specifically states its actions on the website where it is available, as well as on the splash screen of the game itself:

Execution

Trojan creates a folder containing game content, with the name lose lose folder.

On execution, users are able to play a Space Invaders look-a-like game (see screenshot below). When the user shoots an enemy character however, a file or folder in the user's home directory will be deleted.

If the user character is destroyed, the game ends. The Trojan subsequently sends the user's score to a remote server and deletes itself from the compromised computer.