njRAT

njRAT is a remote access Trojan. It is one of the most widely accessible RATs on the market that features an abundance of educational information. Interested attackers can even find tutorials on YouTube. This allows it to become one of the most popular RATs in the world.

Type
Trojan
Origin
Middle East
First seen
1 January, 2013
Last seen
13 July, 2020
Also known as
Bladabindi
Njw0rm
Global rank
8
Week rank
4
Month rank
2
IOCs
5482

What is njRAT Malware?

njRAT, also called Bladabindi and Njw0rm is a remote access trojan that is used to remotely control infected machines. Because of its availability, excess of online tutorials and a robust core feature set along with several implemented evading techniques made njRAT one of the most widely used RATs in the world.

This malware was detected for the first time in 2013, however, some related RATs have been observed by researchers in 2012. The highest surge of njRAT Trojan attacks was recorded in 2014 in the middle east, which is the most targeted region for this malware.

General description of njRAT

njRAT trojan is built on .NET framework. This RAT gives hackers the ability to control the victim’s PC remotely. njRAT allows attackers to activate the webcam, log keystrokes and steal passwords from web browsers as well as multiple desktop apps.

In addition, the malware gives hackers access to the command line on the infected machine. It allows to kill processes as well as remotely execute and manipulate files. On top of that, njRAT is capable of manipulating the system registry. When infected, Bladabindi Trojan will collect several bits of information about the PC that it got into, including the name of the computer, operating system number, country of the computer, usernames and OS version.

Also, this malware is able to target cryptocurrency wallet applications and steal cryptocurrency from PCs. For example, it is known to be able to grab bitcoins and even access credit card information which sometimes can be stored in crypto apps as a means to purchase cryptocurrency.

After infecting a computer the malware uses a variable name and copies into %TEMP%, %APPDATA%, %USERPROFILE%,%ALLUSERSPROFILE% or %windir% – a behavior not uncommon for this time of malware. It can also copy itself into <any string>.exe, to ensure that it will be activated every time the victim switches on their computer.

njRAT trojan has a few tricks up its sleeve to avoid detection by antivirus software. For example, it uses multiple .NET obfuscators to obstruct its code. Another technique that this malware uses is disguising itself into a critical process. This does not allow the user to shut it down. This also makes njRAT hard to remove from infected PCs. Bladabindi RAT can also deactivate processes that belong to antivirus software, allowing it to stay hidden. njRAT also knows how to detect if it has been run on a virtual machine which helps the attackers to set up countermeasures against researchers.

For spreading, njRAT can detect external hard drives connected via USB. Once such a device is detected, the RAT will copy itself onto the connected drive and create a shortcut.

Who created njRAT?

Creators of njRAT are members of an underground hacker community named Sparclyheason. Evidently, they have created a very popular and destructive malware. njRAT was classified as “severe” by Microsoft Malware Protection Center.

In fact, following a large malicious campaign in 2014, Microsoft shut down four million websites in an effort to filter traffic which was going through no-ip.com domains.

njRAT malware analysis

ANY.RUN allows researchers to watch the njRAT in action in an interactive sandbox simulation.

njRAT execution process graph

Figure 1: Displays the lifecycle of njRAT in a visual form as a process graph generated by ANY.RUN malware hunting service

text report of the njRAT malware analysis

Figure 2: A customizable text report generated by ANY.RUN allows to take an even deeper look at the malware and helps to share the research results

njRAT execution process

In our simulation, after njRAT got into the target device and began execution it instantly started its malicious activity. Usually, the initial file renames itself and creates a child process. Sometimes njRAT Trojan injects its code into legitimate processes such as RegSvcs.exe and RegAsm.exe.

The malware also has the ability to run itself through Task Scheduler. This child process executes the main malicious activity. Such activity includes stealing information, connecting to C2 servers and changing the autorun value in the registry to run itself when the operating system starts.

Distribution of njRAT

njRAT trojan uses quite a few attack vectors to infect its victims. For example, the malware is known to target Discord users as part of spam campaigns. In addition, leverage cracks and keygens in well-known software in order to trick users.

Another known distribution method was through a compromised website that tricked users into downloading a fake Adobe product update which in turn installed njRAT malware to the PC. Bladabindi was also featured in spam email campaigns. In this case, it was delivered to potential victims as a malicious attachment.

How to detect NJRAT using ANY.RUN?

To determine whether the sample under review is njRAT or not, you can take a look at the changes that it made in the registry. To do so, open "Advanced details of process" of the malicious process and look at the "Registry changes" tab in the "Events" section. If a process has created a key with the name [kl] into the path HKEY_CURRENT_USER\Software\32_characters_and_digits, you can be sure that the given sample is njRAT.

njrat registry changes Figure 3: Сhanges made by njRAT in registry

Conclusion

The relative ease of operation, multiple tutorials on how to set up this malware and very extensive information stealing feature set have made this RAT one of the most popular remote access trojans in the world.

Even though the peak of its activity was recorded in 2014 and targeted mostly the middle east and India, njRAT Trojan remains to be extremely popular today. This malware is known to have targeted both private and corporate victims and poses a lot of danger to internet users, especially considering that it can be delivered to potential victims in several ways, and preventing infection is much harder in some cases than in others.

Even though Bladabindi malware creators have taken several steps to hinder the analysis, malware hunting services like ANY.RUN allows professionals to easily study njRAT malware samples and share the research results with the world to improve global cybersecurity.

IOCs

IP addresses
193.161.193.99
192.169.69.25
3.13.191.225
52.188.119.144
193.218.118.190
93.41.148.239
37.1.218.71
3.19.6.32
2.95.28.174
95.188.18.107
213.152.161.20
3.135.90.78
3.17.117.250
3.20.98.123
3.137.63.131
85.97.148.74
3.125.102.39
3.125.102.39
3.125.223.134
181.58.154.33
Hashes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isns.net
lightpolebaby-53968.portmap.host
xSkewber-51172.portmap.host
gencho123-61856.portmap.host
gencho123-56629.portmap.host
VannaLamb-21641.portmap.host
xSkewber-41860.portmap.host
iggdaan-41747.portmap.host
skorqro-20231.portmap.host
coronanancy14-50163.portmap.io
skorqro-49877.portmap.host
Yourmum-62036.portmap.host
skorqro-38376.portmap.host
alportoino-55163.portmap.host
josh223424234234-28546.portmap.host
ISLAMv2-32371.portmap.io
jeffposom-27399.portmap.host
jeffposom-39367.portmap.host
portababy-24207.portmap.host
Jqzzo-50729.portmap.host

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