Hey folks Security analysts at Sophos report that a new “backdoor Trojan” has been written by hackers that specifically takes aim at Apple’s Mac OS X operating system.This Backdoor Trojan was detected by Sophos Antivirus.

As even the malware itself admits, it is not yet finished, but it could be indicative of more underground programmers taking note of Apple’s increasing market share.

Here is an excerpt from the default text that is displayed in the full screen window with the reboot button:

"I am a Trojan Horse, so i have infected your Mac Computer. I know, most people think Macs can't be infected, but look, you ARE Infected!
I have full controll over your Computer and i can do everything I want, and you can do nothing to prevent it.
So, Im a very new Virus, under Development, so there will be much more functions when im finished."

SophosLabs has published protection for our customers as OSX/MusMinim-A. Trojans like this are frequently distributed through pirated software downloads, torrent sites, or anywhere you may download an application expecting to need to install it.

Below you can see a whole gallery of the Virus in action below:

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sophos

Sophos says that the potentially nefarious functions served by MusMinim include placing text files on one’s desktop, delivering operation commands like restart or shutdown, running arbitrary shell commands, displaying fraudulent “Administrator Password” windows for phishing purposes, displaying a full screen window that forces reboot for closure, and more.

While this instance certainly doesn’t mark the first known trojan written for Macs, it also won’t mark the last – especially since Apple continues to capture a larger and perpetually-increasing chunk of the PC market. For more info, check out what the folks at Sophos have to say about OSX/MusMinim-A.