How to Use ThreatQ to Defend Against Ransomware

save
Share and earn Cybytes
Facebook Twitter LinkedIn Email

How to Use ThreatQ to Defend Against Ransomware

POSTED BY MIKE CLARK

Ransomware is still a major money maker for cyber criminals and victims are all over the board, ranging from individuals to major corporations. The attack isn’t complex and revolves around a very simple concept – encrypt the victim’s files and hold the files hostage until the victim pays a ransom in order to decrypt them. This forces the victim to really put a price on their data – family albums, historical tax files, databases of customer contact information, or worse, customer credit cards or health records. Backing-up your data in a secure remote location allows you to quickly recover from an attack and, of,course, is a much better strategy than trusting the attacker to decrypt the files after payment. But blocking ransomware from ever reaching your valuable data is the ultimate win. In this post, we will show how you can use ThreatQ’s Threat Library to help defend against ransomware.

In order to defend against ransomware, we need to know where its weaknesses are. Luckily, most ransomware families work pretty much the same way: they execute on the target, encrypt the data, communicate with a C2 server and notify the user of their predicament. Those are the points we want to look into to see how we can dismantle this threat.  To do this, we will map these to the Intrusion Kill Chain [Figure 1].

Figure 1.1 – LMCO’s Kill Chain

 

We will jump immediately to the Delivery step of the kill chain, since the first two phases focus on situational understanding and profiling the attacker over time. The Delivery stage is where we start to gain an understanding of the tactics, techniques and procedures (TTPs) that will allow us to detect and thwart the attack.   Ransomware is delivered in a variety of ways: including exploit kits and spearphishing campaigns. Often, the ransomware payload is one of many delivered through these attack vectors. Stopping the ransomware at the Delivery stage of the Intrusion Kill Chain is an ideal way of preventing the threat.

 

Exploit Kits (EKs)

Exploit kits are a common vector to deliver ransomware. The user visits a site, an exploit runs, then the malicious payload is delivered. There are a number of FREE resources available which ThreatQ supports to stop the threat at this point.

 

The above resources supply URLs and IP addresses of sites hosting exploit kits which can be automatically ingested by ThreatQ. Having them in the system is nice, but that alone will not prevent the attack. Since TQ is not a detection sensor but rather the “conductor of the orchestra” we need to distribute the threat data to the necessary tools. ThreatQ provides over 40 export options [Figure 2] by default, with the ability to create as many custom exports as needed.

Figure 2. Export options in ThreatQ

 

 

These exports allow you to populate your security infrastructure with the relevant data you have ingested. For example, if you have Sourcefire/Snort IPS systems, the ThreatQ export system will automatically generate Snort rules to block the DNS requests for the domains hosting ransomware content [as seen below in Figure 3] and the same goes for Palo Alto devices.  If you have a DNS Sinkhole or a cloud-based service such as OpenDNS this information could be sent over to those tools as well. With our custom export feature we can integrate with nearly any security product.

 

Figure 3. DNS requests for domains hosting ransomware

 

Spearphishing

 

Spearphish emails are another vector to deliver ransomware. Locky ransomware especially makes use of this attack vector. A malicious document that uses obfuscated macros to download the payload is the primary method of infection. It is a relatively simple but still effective way of getting the malware onto the system.

Blocking access to the download server, much like exploit kits above, is one way to stop the ransomware portion of the attack from ever executing. As spearphish attacks target specific people or organizations, many of the spearphish specific indicators never make it to OSINT sources. Only a small handful of commercial vendors provide email-related indicators that intersect with ransomware attacks. These vendors include PhishMe’s Malcovery, FireEye’s iSight Partners and Crowdstrike.

The ThreatQ Platform can facilitate actions such as blocking on spearphish indicators at several layers. As mentioned before, indicators can be sent to IPS systems and DNS Sinkholes in case any users click on the malicious content. If an organization has an e-mail protection system then indicators such as Email Subject, Email Addresses and Attachment information (aka Filename) can be sent to those sensors to proactively block the attempt.

By using freely available indicators and ThreatQ, your team can aggregate ransomware information and disseminate it to your security infrastructure. You can block ransomware before it can run on your systems so you don’t have to resort backups or, far worse, pay the ransom and “trust” the attacker to decrypt the files.

The post How to Use ThreatQ to Defend Against Ransomware appeared first on ThreatQuotient.

Share this post and earn Cybytes
Facebook Twitter LinkedIn Email
Follow
87 Followers
About ThreatQuotient
ThreatQuotient™ understands that the foundation of intelligence-driven security is people. The company’s open and extensible threat intelligence platform, ThreatQ, provides defenders with the context, customization and collaboration needed to ensure that intelligence is accurate, relevant and timely to their business. Leading global companies are using ThreatQ as the cornerstone of their threat operations and management system, increasing security effectiveness and efficiency. For more information, visit http://www.threatquotient.com.

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

Support Cybrary

Donate Here to Get This Month's Donor Badge

 

We recommend always using caution when following any link

Are you sure you want to continue?

Continue
Cancel