Threat Lab

Update: Apple has patched the Bash bug. For more info (including links to download the updates on your Mac), check out this TechCrunch report.

As of last week, there’s a new security bug in the news, and it’s wreaking havoc on the Internet.

(Source: Macworld/Errata Security)

Discovered by Stephane Chazelas, a security researcher for Akamai (who revealed the bad news to the world last Thursday), the ‘Bash bug, or ‘Shellshock’, is a particularly nasty vulnerability affecting the Bourne-Again Shell (thus the Bash acronym) of certain versions of the Unix and Linux operating systems. Yes, that includes derivatives like the Mac OS. In other words, it’s everywhere, and could affect a countless number of devices that connect to the internet.

Remember Heartbleed? This is scarier. And potentially a bigger deal, too.

Why? According to Robert Graham of Errata Security:

“Unlike Heartbleed, which only affected a specific version of OpenSSL, this bash bug has been around for a long, long time. That means there are lots of old devices on the network vulnerable to this bug. The number of systems needing to be patched, but which won’t be, is much larger than Heartbleed.”

Oh, and it IS old. How old? Graham said in a different blog post that the bash issue has been around for 20 years.

For the record, the National Vulnerability Database gave Bash a 10/10! Here’s what you should know.

What is it?

As previously mentioned, it’s vulnerability, a bug affecting the Bash shell used in many Unix and Linux operating systems. Think of the Bash shell as the command-line shell. This means that a hacker could take over and issue remote commands to web servers that aren’t patched. As a result, private information could quickly become public information.

Is every device running Linux or Unix vulnerable?

No. According to Rapid7 Global Security Strategist Trey Ford, there are certain requirements that make a server vulnerable. More specifically, servers capable of passing commands over the internet remotely, are susceptible.

What makes it so dangerous?

Bash may not affect as many devices as Heartbleed, but that may be the only consolation. Because (unlike Heartbleed) Bash lets hackers execute commands remotely, the repercussions could be a lot more serious.

Who should be worried? Should you?

While network administrators who manage internet presence for their companies (particularly those running a CGI app written in Bash or using Bash script), should be concerned, the everyday desktop user probably doesn’t have as much to worry about. That is unless you have a bunch of connected ‘Internet-of-things devices’

What about those Internet-of-Things Devices?

This is largely about patching updates, so while the aforementioned everyday desktop user may not be affected by Bash, that doesn’t necessarily mean his or her connected devices aren’t vulnerable. From home automation systems to routers to webcams to refrigerators, there are many Internet-of-things devices that use the Bash script. And most users would probably never think twice about installing software updates on something like a fridge. Now they should.

What’s being done? 

Companies like Google and Amazon were quick to react, rushing Thursday to patch this latest vulnerability on their end. And because recent versions of the Mac OS are vulnerable, Apple quickly responded, saying that while most OSX users aren’t at risk, the company was quickly working on patching the flaw. You can read more about that here.

What should you do?

Unfortunately, there’s not much you can do as this is a widespread vulnerability rather than say, a sneaky piece of malware. And because this is the case, you, as a consumer, can’t contain it by yourself. Rather, it’s up to the those maintaining the web servers. But absolutely do pay attention, run updates, and look for notifications from service providers who are vulnerable to Bash. And if a company tells you to take action and change your password because their servers are affected, listen to them and get on that immediately.

What about Webroot Servers?

We took all the necessary precautions and upgraded all of our systems to the patched version. We can verify that none of our services are susceptible. You can find our official statement on this support section of our site.

We’ll be keeping a close watch to see how this story unfolds, but in the meantime, take the necessary steps to ensure you’re as protected as possible and install necessary updates as they become available.

It seems as though every few weeks we see a new encrypting ransomware variant. It’s not surprising either since the business model of ransoming files for money is tried and true. Whether it’s important work documents, treasured wedding pictures, or complete discographies of your favorite artists, everyone has valuable data they don’t want taken.

This is the last thing anyone wants to see.

This variant does bring some new features to the scene, but also fails at other lessons learnt by previous variants. Starting with the new features this variant will now just “delete” the files after encrypting them (it just hides them from you). This doesn’t add any more intangibility since they are encrypted with AES-128 anyway, but it does add a greater sense of loss and panic since all of your common data directories will appear to have been cleaned out. Another new feature is the constant raise in price every 24 hours. While price bumping was used on previous variants, this one doesn’t have a limit and will increase by .2 bitcoins (~$97) every 24 hours until you crack or make peace with this loss.

Where this variant falls short on overall volatility is in the failure to delete the VSS (Volume Shadow Service) so using tools like Shadow Explorer will work to retrieve your files and circumvent paying the ransom. As I’ve said in previous blogs I do expect issues like this to be fixed once this malware is adopted by more botnets for widespread distribution.

Webroot will catch this specific variant in real time before any encryption takes place. We’re always on the look out for more, but just in case of new zero day variants – remember that with encrypting ransomware the best protection is going to be a good backup solution. This can be either through the cloud or offline external storage.  Keeping it up to date is key so as not to lose productivity. Webroot has backup features built into our product that allow you to have directories constantly synced to the cloud. If you were to get infected by a zero day variant of encrypting ransomware you can just restore your files back as we save a snapshot history for each of your files up to ten previous copies.

Recently in the news we saw FireEye and Fox-IT provide the ability to decrypt files encrypted by older crpytolocker variants. They used the command and control servers seized by the FBI during operation Tovar. Since they have access to those RSA keys they essentially have the password required for every single file encrypted by a Cryptolocker variant that used Evgeniy Bogachev’s botnet. That is a major portion of the traditional​ red GUI cryptolocker that became famous. Any previous victims from these variants that still have encrypted files left on their machine should be able to decrypt them with ease. All they have to do is upload a single encrypted file ​to this webpage​ and their server will email you your RSA key. Then you can just download their tool (dubbed “DeCryptolocker”) and input the key and it will decrypt all files that are still encrypted. Sadly, anyone that was hit with different variants of encrypting ransomware are still out of luck.

However, since the emergence of their tool to decrypt files for free, there has been a new encrypting ransomware going around that aims at scamming you into thinking this is a similar helpful tool – except that it demands something all scams do….payment.

Presenting ZeroLocker

At least they have a 100% guarantee…

This newest edition to the ever popular business model that is encrypting ransomware doesn’t really have many improvements over the others we’ve already seen. Using Bitcoin for payment is standard now. This variant doesn’t show the GUI untill all encryption is completed and the computer is suddenly restarted. Upon restart this window is presented and threatens that you will lose all your files if you close or remove it. The payment structure is right where industry average is – PAINFUL. This specific variant we analyzed does not delete the VSS (Volume Shadow Service) and you can get all your files back by using programs like Shadow Explorer. Once again I expect issues like this to be fixed once this malware is adopted by more botnets for widespread distribution.

Webroot will catch this specific variant in real time before any encryption takes place. We’re always on the look out for more, but just in case of new zero day variants – remember that with encrypting ransomware the best protection is going to be a good backup solution. This can be either through the cloud or offline external storage.  Keeping it up to date is key so as not to lose productivity. Webroot has backup features built into our product that allow you to have directories constantly synced to the cloud. If you were to get infected by a zero day variant of encrypting ransomware you can just restore your files back as we save a snapshot history for each of your files up to ten previous copies.

In my last blog post about a week ago, I talked about how Cryptolocker and the like are not dead and we will continue to see more of them in action. It’s a successful “business model” and I don’t see it going away anytime soon. Not even a few days after my post a new encrypting ransomware emerged. This one even targets Russians!

Presenting Critroni (aka. Onion)

This newest edition of encrypting ransomware uses the same tactics of contemporary variants including: paying through anonymous tor, using Bitcoin as the currency, changing the background, dropping instructions in common directories on how to pay the scam. Some upgrades that are new to the encrypting ransomware scene are logging the entire directory list of files that were encrypted. They store this list in your documents folder for your convenience come decryption time (how nice of them).

The ransom amount scales with how many files are encrypted. My specific encryption only wanted “.2 Bitcoin (about 24USD)” Please note that the exchange rate displayed by the malware is extremely wrong and .2 Bitcoin is about $120.

This specific variant we analyzed does not delete the VSS (Volume Shadow Service) and you can get all your files back by using programs like Shadow Explorer. I expect that once this malware goes into widespread distribution for the US and UK that “issues” like this will get fixed and the price will rise to around .5 BTC (around $300) on average. Webroot will catch this specific variant in real time before any encryption takes place. We’re always on the look out for more, but just in case of new zero day variants – remember that with encrypting ransomware the best protection is going to be a good backup solution. This can be either through the cloud or offline external storage.  Keeping it up to date is key so as not to lose productivity. Webroot has backup features built into our product that allow you to have directories constantly synced to the cloud. If you were to get infected by a zero day variant of encrypting ransomware you can just restore your files back as we save a snapshot history for each of your files up to ten previous copies.

Please note there are variations in the naming of this file, including Onion and Critroni.A.

Recently in the news the FBI filed a status report updating on the court-authorized measures to neutralize GameOver Zeus and Cryptolocker. While the report states that “all or nearly all” of the active computers infected with GameOver Zeus have been liberated from the criminals’ control, they also stated that Cryptolocker is “effectively non-functional and unable to encrypt newly infected computers.” Their reasoning for this is that Cryptolocker has been neutralized by the disruption and cannot communicate with the command and control servers to receive instructions or send RSA keys after encryption. Read more here

While seizing the majority of the GameOver Zeus Botnets from the suspected “mastermind” Evgeniy Bogachev was a big impact to the number of computers infected with GameOver Zeus – about a 31 percent decrease, it’s a very bold claim to state that Cryptolocker has been “neutralized”. The reason why this claim should be scrutinized is because it is only the samples dropped on victims computers that communicated to those specific servers seized that are no longer a threat. All samples currently being deployed by different botnets that communicate to different command and control servers are unaffected by this siege – the majority of encrypting ransomware. Although Evgeniy Bogachev and his group had control of a major chunk of zeus botnets and command and control servers that deployed cryptolocker, it was certainly not all or even the majority of zeus botnets in existence. Most malware authors spread their samples through botnets that they either accumulated themselves (Evgeniy), or just rent time on a botnet from someone like Evgeniy (most common). So now that Evgeniy’s servers are seized, malware authors are just going to rent from some of the many other botnets out there that are still for lease.

Here are some pictures of samples that we’ve encountered that are still hard at work at infecting users.

All of these work in almost exactly the same way as the infamous traditional cryptolocker we’ve all seen, but they have some improvements. First is that there is no GUI and instead just background changes and texts instructions in every directory that was encrypted. Second is that you no longer pay using a moneypak key in the GUI, but instead you have to install tor or another layered encryption browser to pay them securely and directly. This allows malware authors to skip money mules and increase the percent of profits. The best way to stay protected by attacks like this is to utilize backups to either the cloud or offline external storage. Webroot has backup features built into our product that allow you to have directories constantly synced to the cloud. If you were to get infected by a zero day variant of encrypting ransomware you can just restore your files back as we save a snapshot history for each of your files up to ten previous copies.
So while this is a great win on behalf of the FBI, it’s very bold to claim that cryptolocker is now dead. A better way to put it would be that Evgeniy M. Bogachev’s brand of cryptolocker and anyone who purchased time on his botnet is now useless.

Webroot, the market leader in cloud-based, real-time Internet threat detection, recently returned from the 20^th annual Gartner Security and Risk Management Summit in National Harbor, Maryland.  Attended by many of the world’s top business and IT professionals in industries ranging from finance to information technology to government, the focus of this year’s conference was enablement of an organization to move forward towards its objectives, while ensuring security and protection.  The show’s theme at this year’s conference, “Smart Risk: Balancing Security and Opportunity”, summarized the challenges that many large companies are experiencing today, as they work to ensure the safeguarding of their information without slowing down the company’s productivity.

As a ‘Premier Sponsor’, Webroot attended the Gartner Summit to introduce the next generation threat intelligence services for enterprises, BrightCloud Security Services for Enterprise, which collects and analyzes threat intelligence across multiple vectors – IP, URL, File and Application – from a massive network of nearly 35 million users protected by Webroot endpoint security solutions as well as Webroot technology partners. The team was also on-hand to demonstrate Webroot SecureAnywhere Business-Endpoint Protection, which recently was updated with enhanced management capabilities to help protect large, complex network environments.

With a busy booth during the three days of exhibit time, there was a great deal of interest in Webroot’s Threat Intelligence Server and BrightCloud Services as well as the SecureAnywhere Endpoint Protection solution.  The solutions that were introduced aligned well with two key areas that the security community is interested in – namely finding better protection for their endpoints and using external threat intelligence to make their current devices smarter and optimized for more rapid incident response – as well as fitting in with the conference’s overall theme.

While at the event, Webroot was also part of various security discussions and presentations, including two sessions where CISO’s talked endpoint protection and threat intelligence.  Webroot’s Dave Dufour and Chip Witt both presented on real-time intelligence gathering, and Webroot CTO Hal Lonas presented on the difference between threat data and threat intelligence.  Mike Malloy, VP of Products and Strategy, also gave a talk on ‘the death of traditional antivirus’, a theme that forms the foundation of the Webroot security product lineup.

Thanks largely to a combination of a strong security-focused presence as well as a seamless merging of security goals between attendees and Webroot’s product offerings, the company’s presence at this year’s 2014 Gartner Security and Risk Management Summit was a major success.  Webroot is already planning on similar attendance at the coming Japanese and APAC Gartner summits to continue to drive the momentum forward.

Relying on the systematic release of DIY (do-it-yourself) mobile malware generating tools, commercial availability of mobile malware releases intersecting with the efficient exploitation of legitimate Web sites through fraudulent underground traffic exchanges, as well as the utilization of cybercrime-friendly affiliate based revenue sharing schemes, cybercriminals continue capitalizing on the ever-growing Android mobile market segment for the purpose of achieving a positive ROI (return on investment) for their fraudulent activities.

We’ve recently spotted yet another underground market proposition offering access to Android-based infected devices. Let’s take a peek inside its Web-based command and control interface, discuss its features, as well as the proposition’s relevance within the cybercrime ecosystem.

More details:

Sample screenshots of the commercially available Android-based botnet for hire:

read more…

Cybercriminals continue to efficiently populate their botnets, through the systematic and persistent spamvertising of tens of thousands of fake emails, for the purpose of socially engineering gullible end users into executing the malicious attachments found in the rogue emails.

We’ve recently intercepted a currently circulating malicious campaign, impersonating Barkeley Futures Limited, tricking users into thinking that they’ve received a legitimate “Customer Daily Statement”.

read more…

Cybercriminals continue spamvertising tens of thousands of malicious emails on their way to socially engineer gullible end users, ultimately increasing their botnet’s infected population through the systematic and persistent rotation of popular brands.

We’ve recently intercepted a currently circulating malicious campaign enticing users into executing the fake attachment.

More details:

read more…

Despite the prevalence of Web based client-side exploitation tools as the cybercrime ecosystem’s primary infection vector, in a series of blog posts, we’ve been emphasizing on the emergence of managed/hosted/DIY malicious Java applet generating tools/platforms, highlighting the existence of a growing market segment relying on ‘visual social engineering’ vectors for the purpose of tricking end users into executing malicious/rogue/fake Java applets, ultimately joining a cybercriminal’s botnet.

We’ve recently spotted yet another Web based Java drive-by generating tool, and decided to take a peek inside the malicious infrastructure supporting it. read more…