There has been a lot of hoopla surrounding last week’s release of the Leap-A trojan, and as usual, Mac Daily Journal does an excellent job of cutting to the chase and laying out the facts, (If you’re not an MDJ subscriber, you should be.) Mr. Deathrage has written an excellent description of what the trojan does (and doesn’t), how it spreads (or doesn’t), and how it can be easily thwarted. For those unfamiliar with Input Mangers, a good description of their use and function is provided, and a description of how Leap-A and other potential malware can exploit them is included as well.
However, I think through all the coverage, whether from MDJ, the (increasingly lame) Mac media, or the MSM, one important aspect is being neglected: This trojan can only be activated and spread if you, the user, purposefully do it.
Certainly, permissions can be changed on certain folders to prevent Leap-A from doing it’s malicious deed. And anti-virus vendors have updated their signatures to identify or remove Leap-A, depending on the software package. But none of that is necessary if you use some (un)common sense.
When an unsolicited or unexpected file transfer request from a Bonjour iChat buddy appears (the worm does not spread to AIM or .Mac iChat buddies), you should always ask your buddy, “What are you sending me?” This has always been the right thing to do in the past, and it will always be the right thing to do in the future. Accepting file transfers from anyone, even someone you know and trust, without first verifying what’s being sent and that the sender realizes something is coming from his machine, is, frankly, stupid. (iChat does not have the ability to automatically accept file transfers.) There is no preference, permission, or setting that can compensate for user intelligence. If the sender isn’t aware of the file being sent, or doesn’t respond, decline the file transfer. Trojan thwarted.
When someone posts what are allegedly screenshots from the latest cool piece of software, or the genitalia of a celebrity, or anything else that seems too good to be true, be very skeptical, if not wholly suspicious. Ask yourself why the poster is providing a compressed file instead of posting the pictures outright. Resist the urge (you really can if you try, I swear) to immediately download this unknown, compressed file. Again, no warning, preference, or permission is a substitute for your intelligence.
This trojan spreads after you accept and activate it. Whatever useful system tools the trojan misuses to cause damage, whatever method it uses to attempt to spread, none of these things can occur until you, the user, allow them to occur. The action line for the prevention of this trojan should be to inform users to use their brains, not to fiddle with permissions.
There is no substitute for your own intelligence!
But isn’t this a commercial site? After all, I have one of those ubiquitous Amazon links on the right. Don’t I make money from these pages? Well, No. this isn’t a commercial site because I’m not personally selling anything. This is just for my personal amusement and occasional experimentation. That Amazon ad has produced a single-digit dollar amount of revenue since its inception, and if you’re a regular reader of this page, you know that sometimes I may not update it for months. It’s not any kind of serious money making attempt. 
My .Mac Web Gallery
Recent Comments