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
31 March, 2020
Also known as
Bladabindi
Njw0rm
Global rank
10
Week rank
8
Month rank
8
IOCs
2458

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
192.169.69.25
88.99.106.50
3.137.63.131
3.125.102.39
3.125.102.39
3.19.3.150
3.125.209.94
3.134.196.116
3.13.191.225
18.188.14.65
3.17.202.129
185.244.30.115
193.161.193.99
5.101.151.106
46.1.225.117
3.19.114.185
62.171.147.121
3.135.90.78
3.125.223.134
216.176.190.198
Hashes
18c49edb86a38c6f1947c9fb140336754640339c46bfea392044b920135c8e28
b7a71cad427278bc7714844e2475d2a55375da325ef2c263423e2d68b55e3550
1ff2c6125a8e6741b7a6a8b9d53e5203401e85c5df0c138e3f7de3432723a411
8d5e783f0f45e944c3a6bc52a1b0cde2612ad86b48cd6c846495575cb91657a1
7e604839af438115df3ed1a5cad73f904ac8801e19a89ec80908c531e19d45e3
eac24a30872fc91127d502d75fe2e7e156d109456dff4e6e5f5295d1fe724fbf
e1e251a287b365cc928b87f400f53ac84b440e794d3f177128f01bbc05abb200
95249719b31ff39e7163f93e32498cf13f5f172b2a073081724ad868efce7a69
9cc8a7af7ef1271c29261dff04e87f4acb53dacf3bd7d6df42d7fed107639c48
32264a58fa5fecc970c9a16666e6cf46fed9eee8d1b1ad0ab3c3ed8c4073540b
0a6aacb27a4d462be08b9b826e721a4316f9d0416f90021a7b398e2577f1cb0c
3fd313c0432bd752e21eff66edf85f15926bb8ac229f880aeb7c450f421187bc
d9402d7fcb96cbae633ed5aff7d40c55ba0d204f24c0a6094e5ed0ef5d3cedbb
bfed90afa2b0dc65ce9bb86374bffc995117a0a44d60779727315aede940a9c5
236dec50f7ed638c56aa0e94f297d8359aa717c0d28c0387d097341be3909ee0
6bd24663f2293d3abafcffcf56b6949e7fa16c058bf81d089cc88b7652f214b9
0e14d061870f38d59a77de488aab7546b74fe313da9a5b9848815d1b9245068a
3a13ab3928f472e76b712d01e7673570d066e7ff3b335a84cc1f4cc3173bf55b
74a6a5fade06a41399cd85a532ce957aad2a902816c56dec144c734544168b0a
e9fbf1c3276910538a5e3cc75c4c4fd78241712f3af1b3247bb4136073d08ddd
Domains
menorte.ddns.net
roboticsnetwork.duckdns.org
britianica.uk.com
majul.com
elx01.knas.systems
coodyz.site
gabb.duckdns.org
global-liquidity-collector.eu.ngrok.io
0.tcp.eu.ngrok.io
galli032020.duckdns.org
softnet.duckdns.org
destrors.duckdns.org
2020logs.duckdns.org
graceofgod.duckdns.org
cristinahurtado.duckdns.org
americanmicrosoftclouddepartment.duckdns.org
maintop.duckdns.org
osacr.duckdns.org
sihost.duckdns.org
pvtranns.duckdns.org

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