MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0. 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: 19

Intelligence 19 IOCs YARA 29 File information Comments

SHA256 hash:	899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0
SHA3-384 hash:	bd7e7b745a30d60597827e8bf3fa8f855c171a8813eae3ea76b1dd5e4913a6f511de325ef3fb8941d4994854bf205a9e
SHA1 hash:	e897b508c5f489a39c1736400f9478a026021a54
MD5 hash:	83905ed1eb580d197fcf6f8f24c5d255
humanhash:	colorado-pennsylvania-glucose-may
File name:	Client.exe
Download:	download sample
Signature	QuasarRAT Create hunting rule
File size:	3'276'456 bytes
First seen:	2025-11-23 00:01:09 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'672 x AgentTesla, 19'489 x Formbook, 12'212 x SnakeKeylogger)
ssdeep	49152:Yvlt62XlaSFNWPjljiFa2RoUYIriEwMtoGYnD/9THHB72eh2NT2:YvX62XlaSFNWPjljiFXRoUYIriEw0yDf
Threatray	1'520 similar samples on MalwareBazaar
TLSH	T1B7E55A543BF85E33E16BD2B3D5B0541267F1F82AF363EB0B6181677A1C93B40A8416A7
TrID	58.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 13.2% (.EXE) Microsoft Visual C++ compiled executable (generic) (16529/12/5) 8.4% (.EXE) Win64 Executable (generic) (10522/11/4) 5.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 4.0% (.EXE) Win16 NE executable (generic) (5038/12/1)
Magika	pebin
Reporter	Hexastrike
Tags:	exe QuasarRAT

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

Malware family:

quasar

ID:

File name:

Client.exe

Verdict:

Malicious activity

Analysis date:

2025-11-23 06:40:38 UTC

Tags:

quasar

Link:

https://app.any.run/tasks/7687850b-1745-4803-b79f-9cc7ab4f87d3

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection:

QuasarStealer

Link:

https://www.capesandbox.com/analysis/39604/

Detection(s):

Win.Malware.Generic-9883083-0

Win.Malware.Msilheracles-9900242-0

Win.Packed.Vmprotect-10040864-0

Win.Packed.Downeks-6898097-0

ditekSHen.MALWARE.Win.Trojan.QuasarStealer.UNOFFICIAL

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=69225bda140de26f6c2c6044

Tags:

infosteal quasar

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Сreating synchronization primitives

Connection attempt

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

base64 expired-cert infostealer obfuscated obfuscated quasar quasarrat reconnaissance signed stealer

Link:

https://www.filescan.io/uploads/692256b56c89728b9825cbfc/reports/8da1a3be-4959-4753-9300-2c1a0b9dbd80/overview

Verdict:

Malicious

Labled as:

Win/malicious_confidence_100%

Link:

https://www.hybrid-analysis.com/sample/899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0

Verdict:

Malicious

File Type:

exe x32

First seen:

2025-11-03T13:58:00Z UTC

Last seen:

2025-11-05T04:18:00Z UTC

Hits:

~10

Link:

https://opentip.kaspersky.com/899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0/results?tab=lookup

Malware family:

Quasar RAT

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/65e44897-00a2-4705-b569-11f5e1f6f518

Score:

86%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0

Verdict:

inconclusive

YARA:

11 match(es)

Tags:

.Net Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.31 Win 32 Exe x86

Link:

https://app.malva.re/file/83905ed1eb580d197fcf6f8f24c5d255

Detection:

quasar

Link:

https://mwdb.cert.pl/sample/899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0/

Threat name:

ByteCode-MSIL.Backdoor.Quasar

Status:

Malicious

First seen:

2025-11-04 19:48:00 UTC

AV detection:

22 of 24 (91.67%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=rgnxmguslonqmccen7co2jaira4hxxdqoij2g6ptegomdly6bgya._file

Verdict:

malicious

Label(s):

quasarrat

QuasarRAT

49c0cc5f278c0e3c372a9ef3029697cd36da5cf25ff2f817bbf4256dd3f1f4df

QuasarRAT

6e4f9663e0f5132a1213276c30bdbe5144d07b26edb65126d479c525128cf432

QuasarRAT

834eeb8674c2768a31b15ae5b4a214418f4dd993196b490f4313c6cd0aeef9d8

QuasarRAT

899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0

QuasarRAT

ea8d7f024d9d6a84127fe2873d556b7f97525b9815270633b8087b2c9e24389b

QuasarRAT

error

QuasarRAT

f99ecbd9f26048dbb962f1711199e5f5d00ac8bbd87f539dd5a99631a15fadba

QuasarRAT

+ 1'510 additional samples on MalwareBazaar

Result

Malware family:

quasar

Score:

10/10

Tags:

family:quasar botnet:office04 spyware trojan

Link:

https://tria.ge/reports/251123-axe42sgm2t/

Behaviour

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Enumerates physical storage devices

Quasar RAT

Quasar family

Quasar payload

Malware Config

C2 Extraction:

127.0.0.1:4782

Verdict:

Malicious

Tags:

rat quasar_rat stealer Win.Malware.Generic-9883083-0

YARA:

MAL_QuasarRAT_May19_1 malware_windows_quasarrat win_quasar_rat_client MALWARE_Win_Quasarstealer

Link:

https://app.threat.zone/submission/153f1e1d-a70b-46bc-b21b-00e903ab7e3f

Unpacked files

SH256 hash:

899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0

MD5 hash:

83905ed1eb580d197fcf6f8f24c5d255

SHA1 hash:

e897b508c5f489a39c1736400f9478a026021a54

Detections:

QuasarRAT

Link:

https://www.unpac.me/results/9686b5ab-8c7f-44eb-addf-5c17919a7d30/

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/899b761a925b9b0608446fc4ed240888387bdc707213a379f3219cc1af1e09b0

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:	BLOWFISH_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for Blowfish constants

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:	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:	INDICATOR_SUSPICIOUS_Binary_References_Browsers Create hunting rule
Author:	ditekSHen
Description:	Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

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

Rule name:	INDICATOR_SUSPICIOUS_GENInfoStealer Create hunting rule
Author:	ditekSHen
Description:	Detects executables containing common artifacts observed in infostealers

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:	MALWARE_Win_QuasarStealer Create hunting rule
Author:	ditekshen
Description:	Detects Quasar infostealer

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:	MD5_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for MD5 constants

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:	PE_Digital_Certificate Create hunting rule
Author:	albertzsigovits

Rule name:	pe_imphash Create hunting rule

Rule name:	quasarrat Create hunting rule
Author:	jeFF0Falltrades

Rule name:	quasarrat_kingrat Create hunting rule
Author:	jeFF0Falltrades

Rule name:	RANSOMWARE Create hunting rule
Author:	ToroGuitar

Rule name:	RC6_Constants Create hunting rule
Author:	chort (@chort0)
Description:	Look for RC6 magic constants in binary
Reference:	https://twitter.com/mikko/status/417620511397400576

Rule name:	RIPEMD160_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for RIPEMD-160 constants

Rule name:	SHA1_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA1 constants

Rule name:	SHA512_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA384/SHA512 constants

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)

Rule name:	Windows_Generic_Threat_803feff4 Create hunting rule
Author:	Elastic Security

Rule name:	win_quasar_rat_client Create hunting rule
Author:	Matthew @ Embee_Research
Description:	Detects strings present in Quasar Rat Samples.

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/39604/

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