TDL-4 Botnet is Indestructable?

[G Blance]

TDL-4 detects and disables other malware to hide itself

Over the last year, there have been a number of high profile takedowns of botnets. These takedowns lead to a significant reduction in the amount of spam that computer users see in their inbox.

Security researchers are talking about a new botnet called TDL-4 and they say that it is virtually indestructible. The designers of the botnet used some ingenious methods to ensure that their net isn't as easy to take offline as previous botnets.

Security researcher Sergey Golovanod from Kapersky Labs said in a report on the TDL-4 botnet, "[TDL-4 is] the most sophisticated threat today." Joe Stewart is a malware researcher at Dell SecureWorks, he said, "I wouldn't say it's [TDL-4] perfectly indestructible, but it is pretty much indestructible. It does a very good job of maintaining itself."

There are several factors that work together to make TDL-4 so robust. One of the factors is that the malware infects the master boot record of the computers HDD it resides on. This is the first sector of the hard drive read when a computer starts and the malware rootkit is installed there. That makes the rootkit invisible to security software and the OS.

The thing that makes the botnet even more robust is the method that it uses to communicate with infected computers from the command and control servers. The TDL-4 botnet uses a public peer-to-peer network called the Kad P2P network for one of the two channels it uses to communicate between infected machines and the C&C servers.

Kapersky researcher Roek Schouwenberg wrote in an email to Computerworld, "The way peer-to-peer is used for TDL-4 will make it extremely hard to take down this botnet. The TDL guys are doing their utmost not to become the next gang to lose their botnet."

The hackers behind the botnet also use their own encryption algorithm and use the domain names of the C&C servers as the encryption keys. The use of a public network is the key to the robust botnet and helps ensure the TDL-4 network remains online.

Schouwenberg said, "Any attempt to take down the regular C&Cs can effectively be circumvented by the TDL group by updating the list of C&Cs through the P2P network. The fact that TDL has two separate channels for communications will make any take-down very, very tough."

So far, the TDL-4 botnet is very effective with an estimated 4.5 million Windows computers currently infected. Stewart said, "The 4.5 million is not surprising at all. It [TDL-4] might not have as high an infection rate as other botnets, but its longevity means that as long as they can keep infecting computers and the discovery rate is small, they'll keep growing it."

Another key to the longevity of the TDL-4 malware is the fact that it finds and disables other malware on the computer. This is done because the less likely the user is to know of any infection on their computer, the less likely they are to investigate further and potentially discover the TDL-4 malware on the machine.

Golovanov said, "TDL-4 doesn't delete itself following installation of other malware. At any time [it] can ... delete malware it has downloaded."

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[Mike]

Anyway to get rid of it? Sounds like a nasty bug

[Aeterna]

Anyway to get rid of it? Sounds like a nasty bug

Not yet

[Ewhenn]

Anyway to get rid of it? Sounds like a nasty bug

Not yet

Wrong.

You can boot from a Plain old windows CD and restore the MBR from the recovery console.

Also, detection and disabling access even if infected is relatively simple with hardware based firewall rules, which anyone who properly secures their network should have in place anyways.

Kademila uses the following ports:

4661-4662, 4711-4712 TCP

4664-4665 and 4672 UDP

Any half decent router, even at the consumer level will display a list of open connections. So it's easy to see if soemthing is going on inside your network even if the malware itself has stealth virus characterists. If you see a bunch of outgoing incoming connections on those ports in your router, and you aren't running emule/edonkey, you know something is up. This virus can't hide that.

Stealth virii go back to the early 1990's DOS days. They used to hide and recalculate file information to fake the output (file size and modified dates) on the screen if the file was infected. Back then you didn't really patch exe files that often, and if some exe file that you had on your system for years all of the sudden had a modified date of last week, you knew something was up. The idea of hiding it from the user is not some new concept.

Edited July 2, 2011 by Ewhenn

[Aeterna]

Very interesting

Edited July 3, 2011 by Aeterna