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
30 September, 2020
Also known as
Bladabindi
Njw0rm
Global rank
8
Week rank
1
Month rank
2
IOCs
7339

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
79.134.225.70
13.59.15.185
3.131.123.134
3.131.147.49
45.10.88.108
192.169.69.25
193.161.193.99
3.13.191.225
13.59.15.185
59.6.15.207
95.110.115.67
3.134.39.220
83.227.54.92
3.134.125.175
3.22.30.40
3.130.209.29
79.134.225.95
3.128.29.213
59.22.247.78
181.141.10.37
Hashes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srv1.cn-uinquetex.com
britianica.uk.com
2.tcp.ngrok.io
majul.com
data.pendo.io
elx01.knas.systems
diegomendoza.duckdns.org
peroteclave.duckdns.org
wwwmicrosoftwindowsfirewallsecuritydotco.duckdns.org
iphanyi.duckdns.org
larodrigues91.duckdns.org
sytemforinternationalfiletransferprotoco.duckdns.org
newrainfallfloodinghighongloballythsitim.duckdns.org
doyouhavethistwospecificationinstockplea.duckdns.org
finalwireboxtransferthesessioncookienorm.duckdns.org
hfgjhgfrytyre.duckdns.org
coronaworldhealthorgainizationfilejob.duckdns.org
helpout.duckdns.org
kenzeey.duckdns.org
intrament.duckdns.org

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