MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1. 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

QuasarRAT

Vendor detections: 18

Intelligence 18 IOCs YARA 25 File information Comments

SHA256 hash:	39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1
SHA3-384 hash:	15542edebf2f66ee4bff463bbf3dcee5265697492f01cca380917c7b1a70f39549b7289439d8ad67f64ce682c698b2a2
SHA1 hash:	c1c0802294f86533b65383a43872504ac8d3b57a
MD5 hash:	c8a51c444b1c5acf459e56de6214eb52
humanhash:	pennsylvania-illinois-oxygen-ten
File name:	Update.exe
Download:	download sample
Signature	QuasarRAT Create hunting rule
File size:	1'868'800 bytes
First seen:	2025-10-16 19:56:09 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep	24576:bgrqUXfHyclOYM5NKij8QzO4lcHNF0tXZWLuyWfEez8jObmAR:bgrJPSGOGqnXpyW/m
TLSH	T14A850150B7E88516F1FF2BB9A8B216454773F906D83ADB4F0988906C1EA7780DE507B3
TrID	62.2% (.RLL) Microsoft Resource Library (x86) (177572/6/26) 25.6% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 3.6% (.EXE) Win64 Executable (generic) (10522/11/4) 2.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 1.7% (.EXE) Win16 NE executable (generic) (5038/12/1)
Magika	pebin
Reporter	burger
Tags:	exe QuasarRAT

Intelligence

File Origin

# of uploads :

# of downloads :

160

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

Update.exe

Verdict:

No threats detected

Analysis date:

2025-10-16 19:56:00 UTC

Tags:

anti-evasion

Link:

https://app.any.run/tasks/2d41bdd9-c98e-4ed6-8772-cf13ced4f9fa

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/33125/

Detection(s):

Win.Malware.Generic-9883083-0

Win.Malware.Bulz-9933026-0

ditekSHen.MALWARE.Win.Trojan.QuasarStealer.UNOFFICIAL

Win.Malware.Generic-6623004-0

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=68f14dcf0cffb32442987dc9

Tags:

vmdetect quasar emotet

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Сreating synchronization primitives

Using the Windows Management Instrumentation requests

Creating a file in the %AppData% subdirectories

Launching a process

Enabling the 'hidden' option for recently created files

Creating a process from a recently created file

Creating a file

Connection attempt

Unauthorized injection to a recently created process

Enabling autorun by creating a file

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-debug anti-vm anti-vm base64 cmd cscript explorer fingerprint hacktool lolbin mshta obfuscated packed privilege reconnaissance runonce schtasks update

Link:

https://www.filescan.io/uploads/68f14df9df5cb32bf1f03b95/reports/24911d05-e7b1-44d0-b78c-f0d4b8c24fac/overview

Verdict:

Malicious

Labled as:

IL:Trojan.MSILZilla

Link:

https://www.hybrid-analysis.com/sample/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1

Verdict:

Malicious

File Type:

exe x32

First seen:

2025-10-11T19:55:00Z UTC

Last seen:

2025-10-17T10:11:00Z UTC

Hits:

~10

Detections:

Trojan-PSW.MSIL.Agent.sb Trojan.MSIL.Quasar.a HEUR:Trojan-Banker.MSIL.ClipBanker.gen HEUR:Trojan.MSIL.Quasar.gen

Link:

https://opentip.kaspersky.com/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1/results?tab=lookup

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/3112745a-e779-4559-8759-cc66f750f86c

Result

Threat name:

Quasar

Detection:

malicious

Classification:

troj.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1796850

Signature

.NET source code contains potential unpacker

Antivirus / Scanner detection for submitted sample

Antivirus detection for dropped file

Contains functionality to disable the Task Manager (.Net Source)

Found malware configuration

Hides that the sample has been downloaded from the Internet (zone.identifier)

Joe Sandbox ML detected suspicious sample

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for dropped file

Multi AV Scanner detection for submitted file

Queries memory information (via WMI often done to detect virtual machines)

Queries sensitive disk information (via WMI, Win32_DiskDrive, often done to detect virtual machines)

Sample uses string decryption to hide its real strings

Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)

Uses schtasks.exe or at.exe to add and modify task schedules

Yara detected Quasar RAT

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1

Verdict:

QuasarRat

YARA:

15 match(es)

Tags:

.Net Executable Fody/Costura Packer Html Malicious Managed .NET PDB Path PE (Portable Executable) PE File Layout QuasarRat RAT SOS: 0.14 SOS: 0.15 SOS: 0.18 SOS: 0.20 SOS: 0.22 SOS: 0.23 SOS: 0.24 SOS: 0.25 SOS: 0.26 SOS: 0.27 SOS: 0.29 SOS: 0.32 SOS: 0.34 SOS: 0.35 SOS: 0.63 Win 32 Exe x86

Link:

https://app.malva.re/file/c8a51c444b1c5acf459e56de6214eb52

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1/

Verdict:

Malicious

Threat:

Family.QUASAR

Link:

https://tip.neiki.dev/file/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1

Threat name:

ByteCode-MSIL.Hacktool.Aikaantivm

Status:

Malicious

First seen:

2025-10-14 08:21:23 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

19 of 24 (79.17%)

Threat level:

1/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=hgy5j7ngozlyrxwkfwgyn3engh5jydgca7v2ctzalqjdoazuixyq._file

Verdict:

malicious

Label(s):

quasarrat

Similar samples:

error

QuasarRAT

Result

Malware family:

quasar

Score:

10/10

Tags:

family:quasar botnet:c2|uncoverit.org/upload|c2 spyware trojan

Link:

https://tria.ge/reports/251016-yn1w6atwaz/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Checks for VirtualBox DLLs, possible anti-VM trick

Quasar RAT

Quasar family

Quasar payload

Malware Config

C2 Extraction:

5.83.154.54:8080

Verdict:

Malicious

Tags:

red_team_tool rat quasar_rat backdoor backnet Win.Malware.Generic-9883083-0

YARA:

HKTL_EXE_AlKhaser_Jul_01 MAL_QuasarRAT_May19_1 malware_windows_quasarrat MAL_BackNet_Nov18_1

Link:

https://app.threat.zone/submission/0bfb0ec0-a8a3-42bf-8d51-fde322c2167a

Unpacked files

SH256 hash:

39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1

MD5 hash:

c8a51c444b1c5acf459e56de6214eb52

SHA1 hash:

c1c0802294f86533b65383a43872504ac8d3b57a

Detections:

QuasarRAT

Link:

https://www.unpac.me/results/7474af43-989d-4fa9-875c-dd7c9ace18a6/

Malware family:

QuasarRAT

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/39b1d4fda676/report/overview.html

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

Threat name:

iSpy Keylogger

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/39b1d4fda6765788deca2d8d86ec8d31fa9c0cc207eba14f205c1237033445f1

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:	Check_Dlls Create hunting rule

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:	DebuggerCheck__QueryInfo Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerHiding__Thread 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:	FreddyBearDropper Create hunting rule
Author:	Dwarozh Hoshiar
Description:	Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.

Rule name:	golang_bin_JCorn_CSC846 Create hunting rule
Author:	Justin Cornwell
Description:	CSC-846 Golang detection ruleset

Rule name:	INDICATOR_EXE_Packed_Fody Create hunting rule
Author:	ditekSHen
Description:	Detects executables manipulated with Fody

Rule name:	Indicator_MiniDumpWriteDump Create hunting rule
Author:	Obscurity Labs LLC
Description:	Detects PE files and PowerShell scripts that use MiniDumpWriteDump either through direct imports or string references

Rule name:	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA Create hunting rule
Author:	ditekSHen
Description:	Detects Windows executables referencing non-Windows User-Agents

Rule name:	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL Create hunting rule
Author:	ditekSHen
Description:	Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion

Rule name:	MAL_BackNet_Nov18_1 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects BackNet samples
Reference:	https://github.com/valsov/BackNet

Rule name:	MAL_BackNet_Nov18_1_RID2D6D Create hunting rule
Author:	Florian Roth
Description:	Detects BackNet samples
Reference:	https://github.com/valsov/BackNet

Rule name:	MAL_QuasarRAT_May19_1 Create hunting rule
Description:	Detects QuasarRAT malware

Rule name:	MAL_QuasarRAT_May19_1 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects QuasarRAT malware
Reference:	https://blog.ensilo.com/uncovering-new-activity-by-apt10

Rule name:	MAL_QuasarRAT_May19_1_RID2E1E Create hunting rule
Author:	Florian Roth
Description:	Detects QuasarRAT malware
Reference:	https://blog.ensilo.com/uncovering-new-activity-by-apt10

Rule name:	Multifamily_RAT_Detection Create hunting rule
Author:	Lucas Acha (http://www.lukeacha.com)
Description:	Generic Detection for multiple RAT families, PUPs, Packers and suspicious executables

Rule name:	NET Create hunting rule
Author:	malware-lu

Rule name:	NETexecutableMicrosoft Create hunting rule
Author:	malware-lu

Rule name:	pe_imphash Create hunting rule

Rule name:	RANSOMWARE Create hunting rule
Author:	ToroGuitar

Rule name:	Skystars_Malware_Imphash Create hunting rule
Author:	Skystars LightDefender
Description:	imphash

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)

File information

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

Cape

https://www.capesandbox.com/analysis/33125/

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