Actually, "D'oh" is rather appropriate here. In an old episode of The Simpsons, it was revealed that Chunkylover53@aol.com was Homers Email address. Of course, Simpsons fans galore with net access immediately added "Chunkylover53" to their AIM contact list. As this article points out....
Homer's e-mail address firstname.lastname@example.org, as seen on EABF03, was registered by writer-producer Matt Selman, who also replied to e-mails from fans testing it. "He logged in the night that the episode aired and it was immediately filled with the maximum number of responses. He's tried to answer every one of them and then as soon as he answers a hundred, a hundred more pop in," Al Jean told the New York Post in January 2003.
What's interesting here is that as far as I'm aware (and please, correct me if I'm wrong), the AIM screen-name"Chunkylover53" is not necessarily connected to the "official" email@example.com email address - anyone could have set up that AIM screen-name, using whatever EMail address they feel like. However, people will naturally add "Chunkylover53" to their AIM accounts thinking it will be the "real" Homer. This is where the problems set in.
The "Chunkylover53" AIM screen-name hasn't logged in for quite some time, apparently. Imagine the puzzled expressions worn by Simpsons fans when, all of a sudden, the account came back to life in the last few days with this in their "Away" message....
...yes, "Homer" has seemingly returned, and he comes bearing infection files!
Of course, the "exclusive Simpsons episode" is nothing of the kind - what you actually download is a file called "Kimya.exe", about 150kb in size, and it looks like this:
Run the file, and you won't see a new Simpsons episode - you're actually more likely to see this:
From this point onwards, the PC will likely need a reboot and will be sluggish until cleaned up, constantly throwing out error messages, crashing when attempting to open Windows Explorer etc.
Now, given that the infection links are being passed around via IM Away messages, there was always going to be the possibility of an Instant Messaging worm attack. However, a lot of testing has taken place and so far, we haven't seen any malicious messages or URLs sent via AIM or MSN Messenger.
That's no reason to get complacent though, because what we have seen taking place is possibly quite a bit worse. First of all, a number of hidden files are dropped onto the PC, including Rootkit technology (which the bad guys have helpfully pointed out in the code):
Worse, your PC is deposited into a Botnet of Turkish origin - here's the giveaway traffic stream via an Ethereal log:
....awaiting further instructions from the Botnet C&C center. This particular Botnet has been around since March of this year. The Turkish connection is interesting, because I haven't seen too many Turkish Botnets - and there's been quite a surge in hacking activity from Turkey recently (most notably the DNS attacks on Photobucket and ICAAN by NeTDevilz).
Finally, the infection drops a number of other files onto the PC besides the Rootkit, which are seemingly related to a new variant of this Chinese infection.
It's worth noting that there may only be Instant Messaging infection links sent out if the person running the Botnet Command Center decides to issue all the drones with such a command - so while we haven't seen any IM infection activity, it would be wise not to rule it out completely. We recommend infected users keep an eye on all Instant Messaging activity until they can clean the infection from their computer, just in case.
Whoever is responsible for these messages has changed them a couple of times already - last night, the download link had been updated to look like this:
...and it currently advertises a link for a dating website:
We've reported all links related to this attack, and at least two of the files claiming to be "exclusive Simpsons episodes" are currently offline, though there's bound to be more out there. For now, this is a good reminder to be cautious when randomly adding cool things seen on TV and film to your online applications - you can't always assume the person at the other end is entirely in control, or indeed, related to what you're looking for in the first place.
We detect this infection as Kimya.
Additional Research: Chris Mannon, FSL Senior Threat Researcher
Deepak Setty, FSL Senior Threat Research Engineer