Threat Lab

Shoring Up Your Network and Security Policies: Least Privilege Models

Why do so many businesses allow unfettered access to their networks? You’d be shocked by how often it happens. The truth is: your employees don’t need unrestricted access to all parts of our business. This is why the Principle of Least Privilege (POLP) is one of the...

Online Gaming Risks and Kids: What to Know and How to Protect Them

Online games aren’t new. Consumers have been playing them since as early as 1960. However, the market is evolving—games that used to require the computing power of dedicated desktops can now be powered by smartphones, and online gaming participation has skyrocketed....

Thoughtful Design in the Age of Cybersecurity AI

AI and machine learning offer tremendous promise for humanity in terms of helping us make sense of Big Data. But, while the processing power of these tools is integral for understanding trends and predicting threats, it’s not sufficient on its own. Thoughtful design...

A Cybersecurity Guide for Digital Nomads

Technology has unlocked a new type of worker, unlike any we have seen before—the digital nomad. Digital nomads are people who use technologies like WiFi, smart devices, and cloud-based applications to work from wherever they please. For some digital nomads, this means...

CryptoMix Ransomware: What You Should Know

Reading Time: ~ 2 min.

CrytpoMix has been gaining some traction over the past few months, so it’s a good idea that we provide a rundown of this variant in the ransomware family.

This is ‘barebones ransomware’, so victims aren’t presented with a GUI or a desktop background change. All that is presented is a text file and webpage showing the same text.

notepad

This is one of the FEW ransomware variant that doesn’t have some payment portal in the darknet. There is no need to download any tor browser, as they don’t provide any onion links.

email back

With this variant, victims literally have to email and wait around 12 hours for a response and those responses are encrypted and password protected (to protect the bitcoin wallet address the cybercriminals want payment to be made to).

Example response:

email back

While CryptoMix isn’t fancy, it’s price sure is. 5 BTC (Bitcoin) is an insane amount of money (>$3000), and it wasn’t a few months ago that ransom increases to $700 were all the rage. Also, these criminals even claim that you’ll receive free tech support and all your ransom money goes to a child charity. Please do not be fooled.

Registry Entries added

» HKLM\Software\Microsoft\Cryptography\Defaults\Provider\Microsoft Enhanced RSA and AES Cryptographic Provider
» HKLM\Software\Microsoft\Cryptography\DESHashSessionKeyBackward
» HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Adobe Reader UpdateSoftWare
» HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\*Adobe Reader Update32
» HKCU\Software\Microsoft\Windows\CurrentVersion\Run\AdobeFlashPlayerSoftWare
» HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\*AdobeFlashPlayers32
» HKCU\Software\Adobe Reader LicensionSoftWare\AdobeFirstVersionSoftWare
» HKCU\Software\Adobe Reader LicensionSoftWare\AdobeLicensionSoftWare

MD5 hashes analyzed :

b778bda5b97228c6e362c9c4ae004a19

a0fed8de59e6f6ce77da7788faef5489

Webroot will catch this specific ransomware in real time before any encryption takes place. We’re always on the lookout for more types of threats, 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 consumer 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 see our community post on best practices for securing your environment against encrypting ransomware.

 

 

 

Computer Virus 101

Reading Time: ~ 2 min.

What is a computer virus?

Think of a biological virus – the kind that makes you sick. It’s persistently nasty, keeps you from functioning normally and often requires something powerful to get rid of it. A computer virus is very similar. Designed to relentlessly replicate, these threats infect your programs and files, alter the way your computer operates or stop it from working altogether. It’s estimated that the ‘Conficker’ malware infected more than 10 million computers in 2009, which was a massive amount back then.

The amount of viruses and their capability to inflict damage have only increased since then. Today, hundreds of thousands of them operate over the internet, and new variants are discovered every day. When you couple this with the discoveries of mass-scale security flaws/vulnerabilities (such as ‘Heartbleed’ and ‘Bash’ in 2014), the cyber-world really starts to look like a scary place. It is. But that doesn’t mean there’s nothing you can do to protect yourself and your devices.

How does it find me?

Even if you’re careful, you can pick one up through normal online activities like:

  • Sharing music, files or photos with other users
  • Visiting an infected website
  • Opening spam email or an email attachment
  • Downloading free games, toolbars, media players and other system utilities
  • Installing mainstream software applications without fully reading license agreements

What does it do?

Some computer viruses are programmed to harm your computer by damaging programs, deleting files, or reformatting the hard drive. Others simply replicate themselves or flood a network with traffic, making it impossible to perform any internet activity. Even less harmful versions can significantly disrupt your system’s performance, sapping computer memory and causing frequent computer crashes.

What are the symptoms?

Your computer may be infected if you recognize any of these malware symptoms:

  • Slow computer performance
  • Erratic computer behavior
  • Unexplained data loss
  • Frequent computer crashes

Arming yourself with the best protection

When you arm yourself with information and resources, you’re wiser about computer security threats and less vulnerable to threat tactics. Take these steps to safeguard your PC with the best protection:

Make sure that you have the best security software products installed on your computer:

  • Use anti-virus protection and a firewall
  • Get anti-spyware software
  • Always keep your anti-virus protection and anti-spyware software up-to-date (Webroot SecureAnywhere updates automatically)
  • Update your operating system regularly (most update automatically)
  • Increase your browser security settings
  • Avoid questionable websites
  • Only download software from sites you trust and carefully evaluate free software and file-sharing applications before downloading them

Practice safe email protocol:

  • Don’t open messages from unknown senders
  • Immediately delete messages you suspect to be spam

An unprotected computer is like an open door for malware. Firewalls monitor Internet traffic in and out of your computer and hide your PC from online scammers looking for easy targets. Products like Webroot SecureAnywhere Complete provide total protection from the most dangerous threats out there, thwarting them before they can enter your PC, and standing guard at every possible entrance of your computer to fend off any malware that tries to enter, even the most damaging and devious strains.

While free anti-virus software is available, it simply can’t offer the consistent protection that you need to keep up with the continuous onslaught of new strains. Previously undetected forms of can often do the most damage, so it’s critical to have up-to-the-minute protection that won’t take a break to update and miss the oncoming threat.

Malware as a Service: As Easy As It Gets

Reading Time: ~ 2 min.

 

 

If you’ve ever been infected with serious malware, you may have assumed the culprit is a person sitting in the basement of their mom’s house, or a small group of people huddled in a garage somewhere. It’s really not that simple.  There’s a whole global cyber underground network that’s working diligently to make all this happen for you. It’s the lucrative cyber black market. Mostly everyone has heard the term “black market” at least a few times. It’s referenced in many movies and is often heard on the news when speaking of criminal activity and the purchasing of illegal materials or services.

Malware-as-a-Service is a prosperous business run on the black market that offers an array of services and isn’t just limited to malware or bits of code. And you don’t have to be a computer expert either. Anyone can purchase code that will cause harm to a person’s computers or even hold it for ransom. But once purchased, what are you going to do with it? How will investing in this piece of malware return a profit? There’s still the challenge of getting it out there, getting your potential victims to run the payload for the newly purchased malware on their computer. And most importantly, cashing out on the investment. This is where the entire business model of Malware-as-a-Service comes into play.

It’s all offered in the cyber black market and functions no different than the global markets we hear of. Due to its low key nature, it’s difficult to say exactly how much money is generated from Malware-as-a-Service in this market. But it would be no surprise if it stretched up into the billions.  In this market it’s possible to purchase all the necessary pieces to make it as easy as possible for the investors to profit.

 

MAAS

 

First level: The highly skilled elite programmers or engineers who write malware, develop exploits, and are general researchers. This can be an individual or individuals working together.

Second level: Here are the spammers, botnet owners, distributors, hosted system providers. These people are also skilled, but not always elite. This is where the distribution is handled

Third level: The money mules, treasurers, financial data providers.

These three levels fall under the umbrella of Malware-as-a-Service that can be sold and purchased as an entire package or individual services by a vendor.

The individuals involved aren’t always strictly black hat. There are also grey hat hackers, otherwise known as freelancers who are simply looking to make a profit. A programmer can sell a zero day exploit to the vendor of a software as a bounty. However that same exploit might be able to fetch a far greater profit if sold on the black market. A perfect example of this is Facebook, who offers a minimum of $500 for anyone who can hack their site. With over 700 million users, a Facebook exploit can sell for a pretty hefty price in the black market. As malware becomes more profitable this type of business model will continue to grow.

 

 

Malvertising: When Ads Go Rogue

Reading Time: ~ 3 min.

Advertisements on the internet are no longer just a nuisance. They are now also potentially dangerous. Even sticking to widely used and trusted websites can be risky, as the banner ads they contain may be carrying malicious code.

“Malvertising”, a combination of “malware” and “advertising”, is the technique of using trusted ad networks to deliver malware-loaded advertisements to users on trusted websites. This is not a new technique, but over the last couple of years its use has grown exponentially by cybercriminals because it is so effective.

According to David Kennerley, Sr. Threat Research Manager at Webroot: “Malvertising is a big problem and its return on investment for fraudsters suggests it’s not going away anytime soon.”

Most websites that have advertisements use “ad networks” to manage those ads, giving the site options for what type of ads to deliver to visitors. In a malvertising scenario, a cybercriminal will either hack into an ad network’s server or even sign a fraudulent contract with an ad network, posing as an advertiser in order to gain trust. They will then upload a seemingly legitimate advertisement that is loaded with malicious content, such as a Flash or Javascript exploit. The ad network unwittingly adds this malicious ad into its database so that its customers can choose it as one of multiple rotating ads. Or, it can take more of a social engineering approach and appear on your screen based on your browsing habits, which are tracked by tracking cookies.

Ad-Website pic

“Unfortunately, simply keeping to trusted websites no longer means you’ll stay safe,” said Kennerley. “The outsourced, distributed and chaotic nature of the online advertising industry means that even the world’s most popular websites have no visibility on the ad content displayed on their pages or its original source.”

In recent months, an additional level of complexity has been employed in these types of attacks: “Fingerprinting”, a method of uniquely identifying computers based on meta-data and file dumps. As online advertisers move away from human transactions and toward real-time ad bidding, cybercriminals are finding ways to better target their victims. Ad networks provide user meta-data to advertisers so that they can better advertise to consumers, but this same data can be used by cybercriminals to identify systems that can be exploited. For instance, if the meta-data reveals that a PC’s Adobe Flash is not up to date and a known exploit exists for their version of Flash, they will identify that PC as a target for attack.

malvertising flow chart

 

In addition to identifying potential victims, cybercriminals also use fingerprinting to identify networks and devices to avoid. For instance, if they choose to target only people in specific countries and avoid people in their own country, they can do so using geolocation data. This technique has also been used to evade security researchers by avoiding networks of security companies, making it more difficult to replicate and research these types of attacks.

With malvertising gaining popularity among cybercriminals, protecting yourself from this type of attack is critically important. “Internet users should keep their browsers fully patched, with appropriate in-built phishing and malware protection switched on,” advised Kennerley. “Browser add-ons should be kept up-to-date, with auto-play turned off; or better yet, disable or remove these commonly exploited add-ons completely. Ad-blocking software is becoming a must and of course a strong endpoint protection product is essential.”

What you need to know about the new KeRanger Ransomware.

Reading Time: ~ 3 min.

 

Palo Alto Networks recently discovered ransomware hidden inside of the torrenting app ‘Transmission’. While this may come as a shock to those that still believe the Mac is a fortress that can’t be broken, the rest of us are not shocked at all. In fact, a few months back I wrote a blog warning Mac users not to dismiss Mac malware. It is time to take Mac security seriously. Apple does a great job for the most part, but in order to secure your information and your devices, you need a good Antivirus product.

Transmission app
Back to the threat at hand. This ransomware is bundled in with the Transmission Bittorrent client as a file called “General.rtf”. For most, this file looks like a simple real text file. However, it is actually a Mach-O 64-bit executable file that will execute three days after you run Transmission. This helps keep the ransomware hidden so that users wouldn’t suspect the app they are using for torrenting, but rather the torrents that they are pulling down as the source of infection.

infected file
After the three days, the app executes and drops a file called “kernel_service” into the user’s library directory. This process is named in such a way so as to confuse anyone that looks in Activity Monitor into believing that it is a system process. It then drops three more files in the user’s library: “.kernel_pid”, “.kernel_time” and “.kernel_complete”. It will collect the infected Mac’s model name and UUID then upload the information to one of its Command and Control servers.

 

Command and Control Servers

These servers will respond with a file named “README_FOR_DECRYPT.txt”, in which it explains how to get the key for decryption and the price for the key in bitcoins. The ransomware is able encrypt around 300 different types of file extensions that it finds in the “/Users/” directory and changes the file extension to end in “.encrypted”. This means that the family pictures that you keep on your Mac will now be labeled “GrandCanyon2010.jpg.encrypted” and cannot be opened.

 

Encryption Start point
One of the most important things to note is that the program is still a work in progress. There are many functions that have been found in the code that are not currently being used, like the ability to encrypt your Time Machine backup as well. This of course is the second wall of defense for many people, who believe that because they have a Time Machine backup, they can always just roll back their Mac if something happens.

To add some more context into the expansion of ransomware into the Mac OS, our David Kennerley recently commented in Global Security Mag:

“Given the potential gains for attackers, it’s no surprise that they are now diversifying and targeting OS X – a popular system with a large target base. Add to this the fact that many people believe they are safe from such malware when running OS X, this ransomware has the potential to impact a huge number of people.” 

You can locate the full article here.

I’ve said it before and I will say it again: Mac malware is real. Don’t be an Apple user that finds this out the hard way.

Threat Insights and Trends from the 2016 Threat Brief

Reading Time: ~ 5 min.

Intro from the 2016 Threat Brief:

“2015 was yet another record year for cybercrime, during which more malware, malicious IPs, websites, and mobile apps were discovered than in any previous year. It comes as no surprise that the cybercrime ecosystem continues to thrive, given new innovations and little in the way of risk for those who choose to participate. The continued onslaught of hacks, breaches, and social engineering scams targeting individuals, businesses, and government agencies alike has caused many in the security field to ask if it’s truly possible to defend against a persistent attacker.

At Webroot, we believe it is possible to effectively protect enterprises and users, but only by understanding your adversary and the techniques they employ for their attacks.

Our approach and security solutions reflect our in-depth understanding of the threat landscape and how attackers think, to provide cutting-edge, proven next-generation protection and real-time detection of threats as they emerge. The Webroot 2016 Threat Brief provides a glimpse into the analysis and discoveries made by the Webroot® Threat Intelligence Platform to provide insights on key trends and risks seen by our users over the past year.”

 

The brief in its entirety can be found here.

 

However, in this blog, I want to talk about two sections of the Threat Brief and what I found to be most interesting. The first has to do with new malware discoveries and how often malware ensures it is unique with each new infection. The other has to do with the prevalence and targets of phishing attacks, as well as a tactic to improve your personal online security.

 

Before I go on, it is first important to talk about the source of this data. With respect to malware and phishing site encounters, these stats are pulled directly from Webroot SecureAnywhere users and their real world encounters with these threats. This is an important distinction as it enables us to calculate how frequently different types of attacks occur and the likeliness that an average user encounters such an attack.

 

Let’s begin with what was interesting in the malware detection data, mainly the fact that around 97% of the time, malware is unique to the system it infects. That is to say that the specific malicious file is never seen elsewhere. This is intentionally done by malware authors and distributors to make the discovery of their threats more difficult. The technology behind this technique is not new however, and is known as polymorphism. The overwhelming trend is that malware uses polymorphism, either on the server side where the malware is distributed from, or through the malware itself where with each new infection, the samples change. While polymorphic malware has been around for over a decade, it is now the norm for nearly all threats today.

 

Beyond the polymorphic trend, malware encounter data also showed that Webroot SecureAnywhere users encountered more threats on average than in 2014. The per-user infection rate in 2015 was 1.6 infections per customer, compared to 1.2 in 2014. What this means is that infections are more common and during the course of a year, you will more than likely be exposed to a threat. The good news for Webroot customers is that we’ve protected you from these threats. That said, our users were 25% more likely to encounter threats in 2015 than in 2014.

 

The last bit I want to talk about with respect to malware, is the speed at which churn between variants occurs. We measure this by counting the number of examples per variant that are discovered, on average, before no new samples show up and a new variant is discovered. In 2015, this number plummeted to 97 examples per variant compared to 2014 where nearly 700 examples were discovered. Ultimately, what this shows is that malware authors and distributors are speeding up their variant release process in their efforts to evade detection. Thankfully, the Webroot model for threat discovery isn’t affected by the speed of new malware development, and instead relies on awareness at each individual endpoint we protect. This ensures that even if the samples per variant drops to one, we are still aware of that individual threat and are able to identify and protect against the infection.

 

The second threat type I want to talk about is the notorious phishing attack. These are malicious websites that impersonate legitimate websites as they look to steal login credentials and more. The vast majority of phishing URL’s show up in carefully crafted emails that use social engineering techniques to encourage some call to action. A common example is an email claiming your account has been suspended and to log in to restore access.

 

In 2015, over 4 million phishing URL’s were clicked on by Webroot SecureAnywhere users. The good news is that none of these users had the chance to give away their credentials as SecureAnywhere blocked the URL’s page from loading. The bad news is that that the volume of phishing URL’s has increased considerably over 2014. In 2015, about 50% of WSA users clicked on a phishing URL compared to 30% in 2014. There are a number of factors that are responsible for this increase, but the two main ones are that phishing sites are inexpensive to host and that they are an effective method for collecting credentials. In so long as people can be tricked into clicking on a malicious link, phishing sites aren’t going anywhere.

 

The other interesting data around phishing site detection surrounds correlating the phishing site to the company or entity that is being impersonated. In the Threat Brief, we break them into two main categories which are financial institutions and technology companies. When looking at all phishing sites discovered in 2015, a little more than 2/3 of sites were targeting a technology company such as Google or Apple. This might sound odd as you might think that breaking into someone’s bank account would be more valuable. However, quite the opposite is true. Google is by far the number one target of phishing attacks because the value of breaking into someone’s primary email account is very high. The reason is that an email account provides information about what other accounts an individual has (including financial accounts), as well as the ability to reset those accounts’ passwords as the password reset option validates through the associated email address.

 

This brings me to my final point, which is less about phishing and more about email security. The number one tip I recommend to help improve personal online security is to make sure your primary email account password is unique from all other passwords. This ensures that your email is difficult to break into when a password for another site is compromised. This happens all-too-often by no fault of a user, but rather because businesses are often attacked and credential data is compromised. The first thing hackers do with stolen credential data is to see what other accounts can be accessed. If your email password is unique, there is no chance of it being compromised through a collateral attack.

 

There are many other interesting observations in the full 2016 Threat Brief, and I encourage you to read the full report.

 

 

Cyber Threat Actors

Reading Time: ~ 2 min.

Cyber threats come from a wide array of sources, but can be grouped into three categories:

Hacktivists
These are tech-savvy individuals who are normally motivated by morality. These individuals are also classed by many (including the FBI) as terrorists. One of the main hactivist groups out there is anonymous. This group rose from one of the most popular image boards on the internet, 4chan, where users could post anonymously. Many of the influential figures in 4chan have now left, including the board founder moot (Christopher Poole). 4chan is no longer the entity it used to be. One of the most infamous attacks conducted by anonymous was Project Chanology, where the group targeted scientology.  Famously anonymous retrieved a video of Tom Cruise from the scientology group that was not intended to be seen by the general public: https://www.youtube.com/watch?v=UFBZ_uAbxS0

Cyber Criminals
These are individuals who are motivated by money. These are the people who are responsible for the distribution of ransomware. This is a very lucrative business. It was reported in 2013 that cryptolocker made over $30 million in 100 days. Politcal borders make it appealing for criminals to employ these tactics of making money as it is very hard to prosecute them. The encryption that ransomware hits these machines with is normally unbreakable, with the FBI encrouraging individuals to pay the ransom: http://uk.businessinsider.com/fbi-recommends-paying-ransom-for-infected-computer-2015-10?r=US&IR=T .

It has been observed that some ransomware variants have holes and can be cracked (most notably the linux encoder variant which was targeting web servers). Ransomware isn’t the only tactic cyber criminals employ. Another tactic they employ are botnets. This is where a criminal infects your computer, unknowingly to the individual. The criminal can then take control of the victims computer at any time for whatever purpose they see fit. Normally the attacker will either extract information from the victim, monitor the victim or use the victims computer to attack other systems. A recent case to note in relation to botnets is the arrest of one of the administrators of the Dridex botnet, Andrey Ghinkul. This arrest shows that law enforcement are making a good effort to tackle this problem.

State-Sponsored Threat Actors

These are individuals who are sponsored by a government. They act in political interest of the government sponsoring them. It has been reported by FireEye that China has over 20 APT (advanced persistent threat) groups. APT1 (dubbed by Mandiant) is linked with China’s PLA Unit 61398. It is believed this unit occupies a 12 story building employing hundreds of hackers. These groups pose a particular threat to the US, with the FBI putting some of the people involved on their most wanted list: https://www.fbi.gov/news/news_blog/five-chinese-military-hackers-charged-with-cyber-espionage-against-u.s . China isn’t the only country known for sponsoring cyber attacks. The revelations of Edward Snowden reveals much on the NSA’s antics. Another example of a state sponsored cyber attack is where Turkeys internet servers were attacked a couple of months ago, with the blame being pointed at Russia: http://www.todayszaman.com/anasayfa_political-hackers-suspected-as-turkey-suffers-intense-cyber-attack_407781.html

Locky Ransomware

Reading Time: ~ 4 min.

A new form of ransomware has hit the scene, and although this one has a playful nickname it is no fun at all. The bad news is that “Locky” ransomware will encrypt virtually every commonly used file-type and targets not only local drives, but any networked drives it can find, even if they are unmapped. The good news is that Locky is easily preventable because it relies on MS Word Macros to download and execute the actual malware. The only way to infect a computer with Locky ransomware is to open the attached document from a spam e-mail and allow the Word Macro script to run. (For a general overview of this type of execution, see our blog post about Microsoft Word & Excel Macros.)

Locky is most commonly distributed through spam e-mails that have similar subjects and messages. The subject is typically something like “ATTN: Invoice J-123456748” and the message is usually “Please see the attached invoice (Microsoft Word Document) and remit payment according to the terms listed at the bottom of the invoice”. If the victim follows the instructions to enable Macros, the script will download the Locky payload from a remote server and execute it.

The Locky executable will be stored and run from the %Temp% folder and it will immediately create and assign a unique 16-character Hexadecimal name to the victim (something like “A8678FDE2634DB5F”) which is then sent to the remote server for tracking and identification purposes. Once the Locky executable has launched and assigned the victim a unique ID, it will immediately begin scanning drives for files to encrypt. Not only will it encrypt local files, but it will search for any remote drives it can find (even unmapped network shares) and will encrypt their files as well.

Locky will use the AES encryption algorithm to encrypt all files with the following extensions:

.mid, .wma, .flv, .mkv, .mov, .avi, .asf, .mpeg, .vob, .mpg, .wmv, .fla, .swf, .wav, .qcow2, .vdi, .vmdk, .vmx, .gpg, .aes, .ARC, .PAQ, .tar.bz2, .tbk, .bak, .tar, .tgz, .rar, .zip, .djv, .djvu, .svg, .bmp, .png, .gif, .raw, .cgm, .jpeg, .jpg, .tif, .tiff, .NEF, .psd, .cmd, .bat, .class, .jar, .java, .asp, .brd, .sch, .dch, .dip, .vbs, .asm, .pas, .cpp, .php, .ldf, .mdf, .ibd, .MYI, .MYD, .frm, .odb, .dbf, .mdb, .sql, .SQLITEDB, .SQLITE3, .asc, .lay6, .lay, .ms11 (Security copy), .sldm, .sldx, .ppsm, .ppsx, .ppam, .docb, .mml, .sxm, .otg, .odg, .uop, .potx, .potm, .pptx, .pptm, .std, .sxd, .pot, .pps, .sti, .sxi, .otp, .odp, .wks, .xltx, .xltm, .xlsx, .xlsm, .xlsb, .slk, .xlw, .xlt, .xlm, .xlc, .dif, .stc, .sxc, .ots, .ods, .hwp, .dotm, .dotx, .docm, .docx, .DOT, .max, .xml, .txt, .CSV, .uot, .RTF, .pdf, .XLS, .PPT, .stw, .sxw, .ott, .odt, .DOC, .pem, .csr, .crt, .key, wallet.dat

However, Locky will not encrypt any files where the full Pathname and Filename contain one of the following strings:

tmp, winnt, Application Data, AppData, Program Files (x86), Program Files, temp, thumbs.db, $Recycle.Bin, System Volume Information, Boot, Windows

Like the CryptoWall ransomware that has been seen in the past year, Locky also changes the names of the encrypted files in order to make it more difficult for victims to restore the correct data. Locky uses the naming format of “[unique_id][identifier].locky” for encrypted files. For example, if Locky assigns the victim a unique name of “A8678FDE2634DB5F” and it encrypts a file like “example.doc”, the file may be renamed something like “A8678FDE2634DB5F0123456789ABCDEF.locky” . In addition to obscuring the original file names, Locky takes the extra step of deleting all Shadow Volume copies on the machine in order to prevent the victim from simply rolling back or restoring their files.

Since the main purpose of Locky is to coerce the victim into paying a ransom to retrieve/decrypt their data, Locky helpfully places recovery instructions in several places on the victim’s drive. Text files named “_Locky_recover_instructions.txt” will be dropped in every folder where files have been encrypted, and the Windows Wallpaper will be changed to “%UserpProfile%\Desktop\_Locky_recover_instructions.bmp”, which contains the same instructions as the text files.

The instructions that Locky provides contain links to a Tor site called the Locky Decrypter Page. The URL for this site is “6dtxgqam4crv6rr6.onion” , and it walks the the victim through the process of paying the ransom and retrieving their data. Details included: the amount of Bitcoins to send as payment, how to purchase Bitcoins, the Bitcoin address to submit payment, and a link to the Decrypter once payment is made.

Text Instructions

locky instructs

Desktop Background Instructions

2

Locky will also store various information in the Windows Registry under these keys:

HKCU\Software\Locky\id – Unique ID assigned to the victim

HKCU\Software\Locky\pubkey – RSA Public Key

HKCU\Software\Locky\paytext – Ransom Note Text

HKCU\Software\Locky\completed – Whether or not the ransomware finished encrypting all available files

HKCU\Control Panel\Desktop\Wallpaper (“%UserProfile%\Desktop\_Locky_recover_instructions.bmp”)

3

Because the Locky ransomware can encrypt all network drives, it is critically important to lock down the permissions on any available network shares. As always, it is also important to perform regularly scheduled backups of all important data, and to have the backup drive stored off-network when not in use. At this time, there is no known way to decrypt files encrypted by Locky (unless ransom is paid), and its deletion of the Shadow Volume copies makes this even harder to circumvent. It has been reported that Locky victims have been successful in retrieving their data after payment is made, but it is never advisable to pay cyber-criminals their requested ransom. With due diligence and good security habits, everyone should be able to avoid being infected by Locky.

Building a secure IoT Gateway using Threat Intelligence

Reading Time: ~ 3 min.

Part 1 and Part 2 of this series provided an overview of Threat Intelligence and hopefully offered some understanding as to what role it can play in helping secure an IoT infrastructure. For those familiar with cybersecurity and how to implement Threat Intelligence in traditional network appliances, the jump to securing an IoT Gateway is fairly straightforward. For those new to the space, trying to put a plan together for integrating Threat Intelligence may seem a bit daunting. This blog is intended to be a guide of questions to start the process.

The first question that should be addressed when building an IoT Gateway is, “What is your audience?” For example, if the given environment in which the gateway will be implemented is closed, meaning no interconnectivity with the Internet, then traditional IP reputation or URL Categorization won’t provide much help. These technologies are built around the expectation that a malicious actor will attack from, or ex-filtrate data to, locations on the Internet. Therefore, with no connection to the Internet these technologies provide little in the way of additional security to an appliance manufacturer. That being said, by definition an IoT Gateway should provide connectivity to the Internet, so the rest of this blog will assume that is the case.

So, what is needed to build an IoT Gateway?

Obviously, there is the interconnectivity that bridges a proprietary physical layer and converts it to TCP/IP traffic. This blog won’t help much with that aspect of the appliance as the respective vendors would know best how to achieve this part of the solution. However, once data has been converted to Internet compatible protocols, building a basic gateway with IP blocking and URL categorization requires: 1) IP packet inspection to extrapolate incoming IP addresses or outgoing URLs, 2) a Threat Intelligence module that allows for the scoring of an IP or URL, and 3) a user interface to manage the policies. Here is a breakdown of each component:

  • Deep Packet Inspection (DPI): Simply put, this is examining each data packet as it comes through the appliance, stripping out header information that contains the IP address for inbound traffic or the outbound URL. There are robust open source solutions such as nDPI from ntop that do a very good job analyzing traffic, but partnering with a provider such as Qosmos might be the right approach for those new to security. The problem isn’t in the ability to inspect packets but rather the ability to do it at line speeds. Those who aren’t experts or who are looking to go to market quickly would do well to find a partner in this space.
  • Threat Intelligence Module: There are several considerations in terms on selecting a provider, how best to implement a solution and how to implement Threat Intelligence in such a way that it becomes a differentiator rather than an “also have”. Take the time to become educated on cost to performance aspects a Threat Intelligence provider offers and understand the ramifications of the level of false positives and uncategorized lookups that a solution will have on the overall implementation of the final product.
  • Policy Management: Nearly as important as the Threat Intelligence itself is the ability for appliance administrators to configure and manage policies. Will there be a need to manage based on region, user, device type or some other granular method specific to an industry? Can the individual device management be done through a cloud-based interface allowing for quicker deployment and lower appliance resource requirements or will it need to be built into the operating system for a given appliance to be managed locally? Taking the time to ask these and other questions around the user interface is key to building a successful solution.

The intent of this post is to identify key considerations that must be addressed to successfully build a secure IoT Gateway. It is a complicated process with issues not limited to traffic management, threat identification at line speeds and the potential for complex policy and usage configurations. As daunting as this may appear, traditional appliance manufacturers have been addressing this need for Information Technology ecosystem for many years and bringing that technology to the Operational landscape is fairly straightforward. Part 4 of this series will push the edge of what is possible by walking through some theoretical configurations that bring Threat Intelligence down from the network appliance to the actual edge device.

New Ransomware PadCrypt: The first with Live Chat Support

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A new ransomware has been discovered and what sets apart this variant from the rest is its implementation of a chat interface embedded into the product.

That link for “Live Chat” will prompt the window for live support. The window should look like this and will allow you to talk directly with the cyber criminal.

Currently the Command and Control servers are down so currently there is no encryption being performed and we were unable to chat with any “developer” to see what they would say. However, we presume it’s just to aid in the process of getting a bitcoin wallet address, filling it with coins, and sending the payment securely. This task can be complicated to unsavvy users so we suspect this feature was created to add a more human element to the aid of receiving the ransom.

These are the standard instructions that also are available if you click “decrypt help” and can be a daunting task for those not familiar with the process. This is why we suspect the chat feature was added. Also, for the first time that we’ve seen on any ransomware sample – it comes with a uninstaller. Located in %AppData%\PadCrypt\unistl.exe it will remove all files and registry entries associated with the infection. However, it will still leave all your files encrypted.

The rest of the drill with this ransomware is pretty standard – “.pdf.scr” extension on the encrypted files, Volume Shadow service is deleted, decryptor tool is provided to decrypt your files after paying ransom.

PadCrypt infection samples: From ZeroBin
MD5 8616f6c19a3cbf4059719c993f08b526 (C2: cloudnet.online)
MD5 aface93f4d6a193c612ea747eaa61eaa (C2: annaflowersweb.com)
Dropped files:
17822a81505e56b8b695b537a42a7583 (package.pdcr)
7d2822aedddd634900a4c009ef0791a9 (unistl.pdcr)

Webroot will catch this specific variant in real time before any encryption takes place. We’re always on the lookout 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 consumer 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 see our community post on best practices for securing your environment against encrypting ransomware.

Why Webroot is Proven Next-Generation Endpoint Security

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Within the last several years, online threats have continued to evolve at disturbingly high rates, and are more robust than ever before. According to the data we’ve seen across the Webroot Threat Intelligence Platform, many new attacks are targeted, adaptive (polymorphic) malware variants that appear suddenly in several points across a targeted company’s network and then may never be seen in the same way again. When so many threats are tailor-made and can even be purchased as a service in the criminal networks, traditional, reactive cybersecurity just won’t cut it.

At Webroot, we know the only way to protect businesses and individuals is by understanding our adversary and predicting their next move. That’s why we’ve continued to expand our threat intelligence and integrate it more deeply with our endpoint protection solutions so that new, unknown threats are detected and destroyed as soon as they appear within the networks of any of our customers. This unique, collective protection means that all Webroot customers protect one another. It’s a community of cybersecurity. Our cloud-based threat intelligence is derived from millions of sensors and real-world endpoints around the world to provide proven next-generation endpoint security that can predict, prevent, detect, and respond to threats in real time. With 87,000 business customers (and counting) and partnerships with 40 of the industry’s top security vendors, Webroot is the proven choice for defending against modern malware. If you would like to learn more about out Threat Intelligence Platform, see our website.

In view of the tactics modern malware writers and other cybercriminals have adopted, we invite you to join us at the 2016 RSA conference to find out how our next-generation endpoint security solutions protect businesses and individuals in a connected world. To schedule a meeting with us at RSAC, visit www.webroot.com.

What IP/URL Based Threat Intelligence Can and Can’t do for the IoT

Reading Time: ~ 2 min.

Part one of this series provided a high-level overview of Threat Intelligence, the underlying data types common in the current security landscape and how these data are gathered, analyzed and consumed. As cyber security becomes a key focus for the IoT it may appear, on the surface, much of the existing threat intelligence and the techniques used to gather these data do not directly play a role in protecting IoT devices from malicious actors. Though there are gaps in some areas, specifically with malicious files for IoT devices and closed network threat analysis, much of the threat data can be applied to the IoT once communication with, and across, the Internet occurs.

Many consumer and industrial IoT devices do use custom protocols to communicate with one another in a closed environment which presents a challenge for existing systems to gather and collate data specific to these environments. Fortunately, by definition, devices in the IoT must communication through the Internet requiring proprietary or non-TCP/IP traffic to be converted to TCP/IP. It is at this conversion point existing threat intelligence can play a critical role in protecting IoT devices through the use of traditional malicious IP blocking and traffic management to and from malicious or off category URLs. Some specific cases for the use of these data that directly affect how IoT Gateways can be secured are:

Malicious IP Blocking: One of the most basic ways to protect IoT devices is to prevent known malicious IP addresses from communicating from the Internet to devices inside of a network. If an OT network contains devices that are directly manageable over the Internet and whitelisting is not a viable option due to dynamic addressing, then a very straightforward and extremely successful solution in IT ecosystems, is to block known malicious IP addresses.

URL Categorization and Reputation: Another common, and extremely effective, security measure that is used throughout the IT landscape in perimeter appliances is to limit what a device can communicate with. Through the use of policy and security management filters devices can, at the gateway, be denied the ability to communicate with malicious IP addresses and URLs, preventing the exfiltration of data to unknown or unauthorized entities.

The aforementioned use of IP addresses and URLs in IoT Gateways to help prevent threats from entering an ecosystem does have limitations in terms of detecting threats in closed environments. Today, threat intelligence providers have focused on identifying threats on the Internet at large due to the vast amounts of data available for analysis. Machine learning engines have been a boon for the cyber security industry in their ability to be finely tuned to detect and identify Internet-borne threats but they require vast amounts of data to accurately identify a threat and reduce false positive results. Closed ecosystems, even TCP/IP-based networks, do not have the volume of data the current state of machine learning requires to accurately and definitively detect threats unique to these environments. Building tools and applying new methodologies to these smaller datasets associated with closed ecosystems will be the challenge security architects must overcome as more and more devices make their way into the IoT.

Part three of this series will continue with the discussion around threat intelligence and how to apply it to IoT Gateways to protect OT ecosystems. It will give an overview of a basic gateway, the submodules required to extract necessary data from a data stream for analysis, how to analyze the resulting data and the process for applying policy to the overall environment. The hope will be to keep the discussion moving forward on how existing technology can help protect the IoT.