Slashdot Mirror
Massive Botnet "Indestructible," Say Researchers
CWmike writes "A new and improved botnet that has infected more than four million PCs is 'practically indestructible,' security researchers say. TDL-4, the name for both the bot Trojan that infects machines and the ensuing collection of compromised computers, is 'the most sophisticated threat today,' said Kaspersky Labs researcher Sergey Golovanov in a detailed analysis on Monday. Others agree. 'I wouldn't say it's perfectly indestructible, but it is pretty much indestructible,' Joe Stewart, director of malware research at Dell SecureWorks and an internationally-known botnet expert, told Computerworld on Wednesday. 'It does a very good job of maintaining itself.' Because TDL-4 installs its rootkit on the MBR, it is invisible to both the operating system and more, importantly, security software designed to sniff out malicious code. But that's not TDL-4's secret weapon. What makes the botnet indestructible is the combination of its advanced encryption and the use of a public peer-to-peer (P2P) network for the instructions issued to the malware by command-and-control (C&C) servers. 'The way peer-to-peer is used for TDL-4 will make it extremely hard to take down this botnet,' said Roel Schouwenberg, senior malware researcher at Kaspersky. 'The TDL guys are doing their utmost not to become the next gang to lose their botnet.'"
Yeah, it'll piss off every Grandma and Grandpa with an infected computer, but really.. the best way to deal with these massive botnets is to have the ISPs disable those accounts and contact the owners.
Putting the thing in the MBR just means you can't intercept it during boot.
It doesn't for a second mean it's invisible.
Sounds like a challenge...
Reality has a liberal bias
Somehow I think that's the least of their concerns.
Give me Classic Slashdot or give me death!
Isn't command and control the antithesis of indestructability? Any software that can be patched can be destroyed.
I work at a computer repair shop.
We frequently encounter computers that are kitted up with boot and rootkits, TDL-4 included. Kaspersky's TDSS killer does a pretty good job of removing this stuff, and it's pretty easy to tell if the MBR as been modified. Just fire up a copy of GMER and you'll be able to tell pretty quickly. I see a lot of people posting stuff about having to wipe drives and start over from scratch. That is simply not necessary. The only reason TDL-4 is such a pain in the ass is because it is decentralized, only communicates with a handful of its infected counterparts at a time and modifies the MBR. Even then, it's not impossible to detect or even remove. Just gotta use the right tools...
Curious Yellow was bound to happen sooner or later. I was wondering what was taking botnet authors so long, and why they were relying on a centralized system like DNS for coordinating their bots.
Need a Python, C++, Unix, Linux develop
The fact that the software maintains itself peer-to-peer is also its greatest weakness, because it allows any infected node to identify other infected nodes. So, you set up a number of honeypots and use those to identify infected machines. You then strongarm those machines' ISPs to disconnect their customers until they get their shit together.
Yes, the whole "strongarming the ISPs" thing is a flaw in the strategy since it hasn't really been successful to date, but I'm sure Microsoft can come up with a legal solution to that little hitch.
Think of how they get Al Capone. Noting would make federal prosecutors more interested in the GPL than if they thought it was the best way to nail a bad guy.
BTW, I like the idea of malware coming with a GPL license agreement and link to the source code.
Time for a car analogy.
If someone hot-wires my car, and then rams it into a police station, then I'm not liable. The car manufacturer is not liable. The police are not liable. As a matter of fact, its not even my fault if I left the doors unlocked and the engine running. The person responsible is the bastard that stole it and did the damage.
These viruses and botnets are not spontaneous. They are not random acts of nature. They happen because of bad guys doing bad things. We should all take reasonable precautions, but we shouldn't be held liable for their actions.
When they say indestructible, they mean it's more difficult to steal control of the botnet, like they have done with several other hostile networked threats, not that it can't be detected and removed.
To detect it, run the latest version of GMER.
http://www.gmer.net/
To remove it, you need to run a series of three scanners in this order:
TDSSkiller
http://support.kaspersky.com/viruses/solutions?qid=208280684
Combofix
http://www.bleepingcomputer.com/download/anti-virus/combofix
and Malwarebytes' Antimalware
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?tag=mncol;1
Note that TDL4 is often a blended threat, and has other secondary infections that can cause issues. One of the most common does search redirection that can make it hard to get to the tools to remove it. Most versions of that you can work around by clicking on the Google cache of the site with the tool instead of the link itself.
As for who to blame, most of the infections installed on people's machines were abusing exploits in Adobe Flash. Keeping up to date helps, but I started installing Flashblock on my client's systems because I was convinced there were unknown Flash exploits.
-Z
I had a bit of trouble removing it with TDSS kiler a few weeks ago, but got there in about half an hour.
If it wont run you will need the file association reset tool.
http://support.kaspersky.com/downloads/utils/tdsskiller.zip
> What if someone wrote malware that would run a VM from the boot sector, and
> then ran your existing OS from the VM?
You would notice when your 3D performance began to suck ass. And when either all of your devices became virtual ones or all other performance (net, disk, etc) also began to suck ass. Unless you assume a genius who can create a VM environment that works perfectly transparently, has almost zero overhead and otherwise breaks major new ground in the science; and that they waste their time on a virus instead of kicking VMWare, RedHat, QEMU, etcs ass and seizing a multi-billion dollar red hot market segment.
Democrat delenda est
If magically tomorrow every single Windows box was Linux instead, socially-engineered malware would appear the next day.
One thing that protects Linux, and that has little to do with the OS itself, is the FOSS ecosystem. Pretty much everything you could want is available for free from trusted repositories, and so there is little or no incentive to download and install warez or other pirated software that may have been tampered with. You would still be right, though, if being the dominant "OS for the masses" implies that a similar proprietary closed-source ecosystem would quickly arise around it.