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
18 February, 2020
Also known as
Bladabindi
Njw0rm
Global rank
10
Week rank
5
Month rank
9
IOCs
2107

What is njRAT Malware?

njRAT, also called Bladabindi and Njw0rm is a remote access trojan which 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 jn RAT 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 which 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
181.58.155.117
181.141.0.182
185.140.53.153
18.223.41.243
18.188.14.65
181.58.154.33
192.169.69.25
216.176.190.198
51.36.50.92
37.203.214.31
81.61.77.92
197.25.208.1
3.17.202.129
46.98.144.40
3.19.114.185
87.117.235.116
3.19.3.150
186.147.55.19
79.134.225.16
193.161.193.99
Hashes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app.raaft.io
elx01.knas.systems
al3nzii.myq-see.com
ponymaltadns.duckdns.org
aquaserver.duckdns.org
barcelonasevere.duckdns.org
keepservjfjf.duckdns.org
treintallegamos.duckdns.org
navidadserverazul.duckdns.org
ververdenuevo.duckdns.org
messielmejor.duckdns.org
jblllegolahora.duckdns.org
cartagenacity.duckdns.org
medellinmedell.duckdns.org
ibagueibague.duckdns.org
agrariobuenasuerte.duckdns.org
elsalvaje.duckdns.org
administradorduck.duckdns.org
computadordns.duckdns.org
soccerduck.duckdns.org

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