MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6. 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: 19


Intelligence 19 IOCs YARA 15 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6
SHA3-384 hash: 7753c7b12199e2869964ddb6b6a5fbf64132b5670cf548aa058a999b483dde088b41a8b13461d62e17399331d3a2d31f
SHA1 hash: 599f80a79efdc584c70f4f763c663b06d432393c
MD5 hash: 833368e3029a38a4f87207acd537070e
humanhash: double-yellow-cup-zebra
File name:ComprovantePDF.exe
Download: download sample
Signature njrat
Create hunting rule
File size:10'495'856 bytes
First seen:2026-01-06 08:25:20 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash b41ac626c7b6ae6ac604f7789254aa7d (1 x PureLogsStealer, 1 x njrat)
ssdeep 98304:MLo4G2x0j6035YeeldVFR6Av3Nssa7kZGmm610wpDDAdj14:CocgTefNsxoMm53DIjy
TLSH T1AAB65B32F254AA77C09E173980AB8A301338825A4B13CBC756D499FDFD56AC23F7564B
TrID 64.2% (.EXE) Win32 EXE PECompact compressed (generic) (41569/9/9)
16.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.9% (.EXE) Win32 Executable (generic) (4504/4/1)
3.2% (.EXE) Win16/32 Executable Delphi generic (2072/23)
3.1% (.EXE) OS/2 Executable (generic) (2029/13)
Magika pebin
Reporter smica83
Tags:exe NjRAT signed

Code Signing Certificate

Organisation:AURORA SOLUCOES & TURISMO LTDA
Issuer:SSL.com EV Code Signing Intermediate CA RSA R3
Algorithm:sha256WithRSAEncryption
Valid from:2025-10-13T21:51:43Z
Valid to:2026-10-13T21:51:43Z
Serial number: 18c1f0e7cac9039caff80eaddf948ee1
Intelligence: 5 malware samples on MalwareBazaar are signed with this code signing certificate
Cert Graveyard Blocklist:This certificate is on the Cert Graveyard blocklist
Thumbprint Algorithm:SHA256
Thumbprint: f2426bbb42ceb181d31d743936d9dce89bc9cdf307ce9f80358634d95b197afb
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
181
Origin country :
HU HU
Vendor Threat Intelligence
Malware configuration found for:
NETReactor
Details
Link:
https://research.acce.ciphertechsolutions.com/results/c6054b98-1796-4ab3-8c8d-a6fc4550f9d3/
Malware family:
n/a
ID:
1
File name:
ComprovantePDF.exe
Verdict:
Malicious activity
Analysis date:
2026-01-06 08:25:43 UTC
Tags:
auto-startup remote xworm netreactor
Link:
https://app.any.run/tasks/9c986bf7-cbf8-469e-93ea-118e8830652f

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/47831/
Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=695cc72ce148d42004dfc778
Tags:
autorun spam
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file
Creating a process from a recently created file
Сreating synchronization primitives
DNS request
Connection attempt
Using the Windows Management Instrumentation requests
Sending a custom TCP request
Enabling autorun by creating a file
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
adaptive-context anti-debug base64 crypto embarcadero_delphi fingerprint installer-heuristic obfuscated overlay packed powershell privilege reconnaissance signed unsafe xworm
Link:
https://www.filescan.io/uploads/695cc72719d1255be89c96c7/reports/c6f81efd-b388-4f88-9fe0-edbe296e53f7/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-01-06T03:57:00Z UTC
Last seen:
2026-01-08T00:56:00Z UTC
Hits:
~100
Detections:
Backdoor.MSIL.XWorm.a Backdoor.Agent.TCP.C&C HEUR:Backdoor.Win32.XWorm.gen Backdoor.MSIL.XWorm.c Backdoor.MSIL.XWorm.b Trojan.Win32.Agentb.toyy Trojan.Win32.Agentb.toyx UDS:DangerousObject.Multi.Generic
Link:
https://opentip.kaspersky.com/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/854d4d10-ad28-4524-89a5-bdcd2edb8df2
Result
Threat name:
XWorm
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
62 / 100
Link:
https://www.joesandbox.com/analysis/1845369
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
AI detected suspicious PE digital signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Found malware configuration
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sample uses string decryption to hide its real strings
Sigma detected: Execution from Suspicious Folder
Sigma detected: Suspicious Program Location with Network Connections
Suricata IDS alerts for network traffic
Yara detected XWorm
Behaviour
Behavior Graph:
Download SVG
Score:
77%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6
Verdict:
njRat
YARA:
10 match(es)
Tags:
.Net .Net Obfuscator .Net Reactor Executable Managed .NET njRat PDB Path PE (Portable Executable) PE File Layout RAT SOS: 0.53 Win 32 Exe x86
Link:
https://app.malva.re/file/833368e3029a38a4f87207acd537070e
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6/
Verdict:
Malicious
Threat:
Family.NJRAT
Link:
https://tip.neiki.dev/file/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6
Threat name:
Win32.Backdoor.XWorm
Create hunting rule
Status:
Malicious
First seen:
2026-01-06 08:26:18 UTC
File Type:
PE (Exe)
Extracted files:
20
AV detection:
16 of 24 (66.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=kh65qozxg6w5p44dfpik2c2wqy6avd347g6mc36xq7i24s2ahtta._file
Result
Malware family:
xworm
Create hunting rule
Score:
  10/10
Tags:
family:xworm discovery rat trojan
Link:
https://tria.ge/reports/260106-kfgxesykfr/
Behaviour
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops desktop.ini file(s)
Checks computer location settings
Drops startup file
Executes dropped EXE
Loads dropped DLL
Detect Xworm Payload
Xworm
Xworm family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/43e75697-69b0-4e5f-b9ad-8320a3378d42
Unpacked files
SH256 hash:
51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6
MD5 hash:
833368e3029a38a4f87207acd537070e
SHA1 hash:
599f80a79efdc584c70f4f763c663b06d432393c
Link:
https://www.unpac.me/results/4d510843-89fb-479b-a2ef-72f2c13db4d2/
SH256 hash:
37ccd2ec2e7f1932785854c70ffd7b94192de6fbe4cabd92e9ba4767d32e9f19
MD5 hash:
d35392f620c5a8d824876529cf17e467
SHA1 hash:
d4159c20913b8b516f636112cb9919314666054e
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/4d510843-89fb-479b-a2ef-72f2c13db4d2/
SH256 hash:
d7d87163a3e916a38cb3c6eb700555d65b2ac0ff851f6ebaba3394761f9d3e8c
MD5 hash:
dfba9269ae7b1b96e9aa5f7e33035693
SHA1 hash:
fa37479ff1f591a531191892fea49a51640e6b60
Link:
https://www.unpac.me/results/4d510843-89fb-479b-a2ef-72f2c13db4d2/
Malware family:
DnlibLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/51fdd83b3737/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
XWorm
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/51fdd83b3737add7f3832bd0ad0b56863c0a8f7cf9bcc16fd787d1ae4b403ce6

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:Borland
Create hunting rule
Author:malware-lu
Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerException__SetConsoleCtrl
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:Detect_PowerShell_Obfuscation
Create hunting rule
Author:daniyyell
Description:Detects obfuscated PowerShell commands commonly used in malicious scripts.
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:Lumma_Stealer_Detection
Create hunting rule
Author:ashizZz
Description:Detects a specific Lumma Stealer malware sample using unique strings and behaviors
Reference:https://seanthegeek.net/posts/compromized-store-spread-lumma-stealer-using-fake-captcha/
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:Njrat
Create hunting rule
Author:botherder https://github.com/botherder
Description:Njrat
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)
Rule name:test_Malaysia
Create hunting rule
Author:rectifyq
Description:Detects file containing malaysia string

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/47831/

Comments