MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry

njrat

Vendor detections: 10

Intelligence 10 IOCs YARA 3 File information Comments

SHA256 hash:	8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b
SHA3-384 hash:	365610ec8aaf155a08ce99919bcdebeea31b7bd02af37398145190940ccd38a26eb48668a4aa24d67da859009a73fc7b
SHA1 hash:	85d2932648684db477c08a1176695592f252eebb
MD5 hash:	9eb2ba465b718fea2c605ab9603c40f9
humanhash:	aspen-seventeen-fish-harry
File name:	FSameMdC.exe
Download:	download sample
Signature	njrat Create hunting rule
File size:	24'064 bytes
First seen:	2020-09-17 13:47:20 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'750 x AgentTesla, 19'656 x Formbook, 12'248 x SnakeKeylogger)
ssdeep	384:bslUlEvOEJ8xWwYJOMiOBZEdj1567gtwi5HhbQmRvR6JZlbw8hqIusZzZXN:ceEvwIlLMRpcnue
Threatray	309 similar samples on MalwareBazaar
TLSH	F3B2290E3FB98856C5BC1B7486A5965003B091470423EE2FCDC964DBAFB37D92D48AF9
Reporter	pmelson
Tags:	exe NjRAT

Intelligence

File Origin

# of uploads :

# of downloads :

129

Origin country :

n/a

Vendor Threat Intelligence

Detection:

Njrat

Link:

https://www.capesandbox.com/analysis/62908/

Result

Verdict:

Malware

Maliciousness:

Behaviour

Sending a UDP request

Creating a file in the %temp% directory

Creating a process from a recently created file

Creating a file

Creating a process with a hidden window

Creating a window

DNS request

Using the Windows Management Instrumentation requests

Sending a custom TCP request

Unauthorized injection to a recently created process

Launching the process to change the firewall settings

Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch

Enabling autorun by creating a file

Result

Threat name:

njRat

Detection:

malicious

Classification:

troj.adwa.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/469138

Signature

.NET source code contains potential unpacker

.NET source code references suspicious native API functions

Antivirus / Scanner detection for submitted sample

Antivirus detection for dropped file

Contains functionality to log keystrokes (.Net Source)

Creates autostart registry keys with suspicious names

Detected njRat

Drops PE files to the startup folder

Machine Learning detection for dropped file

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Modifies the windows firewall

Multi AV Scanner detection for dropped file

Multi AV Scanner detection for submitted file

Protects its processes via BreakOnTermination flag

Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)

Uses dynamic DNS services

Uses netsh to modify the Windows network and firewall settings

Yara detected Njrat

Behaviour

Behavior Graph:

Download SVG

Detection:

njrat

Link:

https://mwdb.cert.pl/sample/8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b/

Threat name:

ByteCode-MSIL.Backdoor.Bladabhindi

Status:

Malicious

First seen:

2020-09-17 13:49:05 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

28 of 29 (96.55%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=rbarhgrhheqhennkhuynnonvrp2v5qrb25pertzfjqmv4d4ho6fq._file

Result

Malware family:

njrat

Score:

10/10

Tags:

upx spyware evasion persistence trojan family:njrat

Link:

https://tria.ge/reports/200917-arx241ykas/

Behaviour

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Modifies service

Suspicious use of SetThreadContext

Adds Run key to start application

Drops startup file

Loads dropped DLL

Reads data files stored by FTP clients

Reads user/profile data of web browsers

Uses the VBS compiler for execution

Executes dropped EXE

Modifies Windows Firewall

UPX packed file

njRAT/Bladabindi

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

NJRat

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:	CN_disclosed_20180208_c Create hunting rule
Author:	Florian Roth
Description:	Detects malware from disclosed CN malware set
Reference:	https://twitter.com/cyberintproject/status/961714165550342146

Rule name:	Njrat Create hunting rule
Author:	JPCERT/CC Incident Response Group
Description:	detect njRAT in memory

Rule name:	win_njrat_w1 Create hunting rule
Author:	Brian Wallace @botnet_hunter
Description:	Identify njRat

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

njrat

exe 8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b

(this sample)

Link

https://www.virustotal.com/gui/file/8841139a2739207235aa3d30d6b9b58bf55ec221d75e48cf254c195e0f87778b/detection

Delivery method

Distributed via web download

Cape

https://www.capesandbox.com/analysis/62908/

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