MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe. 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: 12


Intelligence 12 IOCs YARA 15 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
SHA3-384 hash: 2d94a021229e1b00eaffd53b06ea72c12d0f112de4d434a9cc6519cec724d545edaa1b287d9222ff43be42c1a77aa707
SHA1 hash: 8dbd9f0422f855600c633eb4341e117f9b61d732
MD5 hash: f34751408414d724242979eafe592197
humanhash: kentucky-nevada-one-winner
File name:gk1oq6z.exe
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:2'076'160 bytes
First seen:2025-06-17 06:12:06 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'602 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 24576:8R4xSWeWBRYRR1qJvHIPbcNE0KKSb7yviUSQaBaOwIRxl2S62/9nq+NbnbUXsZz7:E4n7YReEwKKSb7L3wip63uhCL9
Threatray 28 similar samples on MalwareBazaar
TLSH T178A5AE2439EA401AF1F7AF75D7D0F5DA8A7EF2233606965E245603460E23B41EDC723A
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 abuse_ch
Tags:exe QuasarRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
454
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
gk1oq6z.exe
Verdict:
Malicious activity
Analysis date:
2025-06-17 06:57:58 UTC
Tags:
auto-reg crypto-regex
Link:
https://app.any.run/tasks/884d2679-915d-4c8b-b337-5423fcbadc8a

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/9812/
Gathering data
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Creating a file in the %AppData% subdirectories
Launching a process
Enabling autorun by creating a file
Verdict:
Malicious
Labled as:
MSIL.Krypt.Generic
Link:
https://www.hybrid-analysis.com/sample/b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/5f96c31f-febe-4690-accd-5a4573cdda97
Result
Threat name:
Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1716165
Signature
.NET source code contains potential unpacker
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Installs a global keyboard hook
Joe Sandbox ML detected suspicious sample
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sample uses string decryption to hide its real strings
Uses dynamic DNS services
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1716165 Sample: gk1oq6z.exe Startdate: 17/06/2025 Architecture: WINDOWS Score: 100 31 rockyx22.duckdns.org 2->31 41 Found malware configuration 2->41 43 Multi AV Scanner detection for submitted file 2->43 45 Yara detected Quasar RAT 2->45 49 3 other signatures 2->49 9 gk1oq6z.exe 5 2->9         started        13 Windows.exe 3 2->13         started        signatures3 47 Uses dynamic DNS services 31->47 process4 file5 27 C:\Users\user\AppData\Roaming\...\Windows.exe, PE32 9->27 dropped 29 C:\Users\user\AppData\...\gk1oq6z.exe.log, CSV 9->29 dropped 51 Uses schtasks.exe or at.exe to add and modify task schedules 9->51 53 Hides that the sample has been downloaded from the Internet (zone.identifier) 9->53 15 Windows.exe 2 9->15         started        19 schtasks.exe 1 9->19         started        signatures6 process7 dnsIp8 33 rockyx22.duckdns.org 176.160.157.96, 8888 BOUYGTEL-ISPFR France 15->33 35 Multi AV Scanner detection for dropped file 15->35 37 Hides that the sample has been downloaded from the Internet (zone.identifier) 15->37 39 Installs a global keyboard hook 15->39 21 schtasks.exe 1 15->21         started        23 conhost.exe 19->23         started        signatures9 process10 process11 25 conhost.exe 21->25         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe/
Threat name:
Win32.Infostealer.Berbew
Create hunting rule
Status:
Malicious
First seen:
2025-06-15 20:59:27 UTC
File Type:
PE (.Net Exe)
Extracted files:
4
AV detection:
23 of 24 (95.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=w57j3fjwvpeojd26jq5twgz5eewyig4yg5n42l64mcwcyefdq77a._file
Verdict:
malicious
Label(s):
quasarrat
Create hunting rule
Similar samples:
2a6add589b534632a04d3c6eaec0c4a7d6b072bffbb84c0b800bb24ef2ad1ab0
QuasarRAT
2adbf68e583680bf9804404c43990adf4f011783f4f1cdddcc9afb67039a16a8
QuasarRAT
62e2c7d860a0e3e0975c5b9da5193f9ab3ca6c56ef4eea46d17cc87ac4598b90
QuasarRAT
b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
QuasarRAT
e553c34b8aabb6ad42dfdb8a77759b32c6c035f2fc82618eefa2261c71dee761
QuasarRAT
error
QuasarRAT
f879f50e21830b34b77fd94a33b6c395b9837bb701a7f5e4dad2e9d287af9e72
QuasarRAT
+ 18 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  7/10
Tags:
n/a
Link:
https://tria.ge/reports/250617-gyrb2awycs/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Executes dropped EXE
Verdict:
Malicious
Tags:
Win.Malware.Generic-9883083-0
YARA:
n/a
Link:
https://app.threat.zone/submission/6a9ac1fb-8bc2-4ed1-a871-408e0e770d9b
Unpacked files
SH256 hash:
b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
MD5 hash:
f34751408414d724242979eafe592197
SHA1 hash:
8dbd9f0422f855600c633eb4341e117f9b61d732
Link:
https://www.unpac.me/results/23b417cf-1471-4de5-8b7e-424723fe371e/
SH256 hash:
ecef261361ca1853aa0844d60b509befb9592388bdf6dc91979295493d5c8ef0
MD5 hash:
9709dd6306e5e861911611c2974b946c
SHA1 hash:
27988e79d6c52262087c1224d3703a21536d6bce
Detections:
SUSP_NET_Large_Static_Array_In_Small_File_Jan24
Create hunting rule
HKTL_NET_GUID_Quasar
Create hunting rule
Link:
https://www.unpac.me/results/23b417cf-1471-4de5-8b7e-424723fe371e/
Parent samples :
b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe
941c4c116f4b9bd1963f0cdbb39a35b4208f964de9e4214a616581ee00a91f40
f5a8c8e7ae8328c7fc396423188c153fc6a9cfce132b1a5bb288086110fccfc7
1c1d02588f167f909a6ae2ba2d1e4ffba2b2f2fe538e38f92b2434dd08e38068
5b8efcc4d2e4dbabcee1ecd25d97cd0624ea1a9882225e382423079f7907876b
b8c953c0e089328ce75c4a27793d442fe89b14c585c09bcce8a448124d3f64ab
653d9f4361cb046b9f4e376058ac1b2a66bcd014cce1089e68aabc1230430391
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/b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe

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:Costura_Protobuf
Create hunting rule
Author:@bartblaze
Description:Identifies Costura and Protobuf in .NET assemblies, respectively for storing resources and (de)serialization. Seen together might indicate a suspect binary.
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:Detect_PowerShell_Obfuscation
Create hunting rule
Author:daniyyell
Description:Detects obfuscated PowerShell commands commonly used in malicious scripts.
Rule name:growtopia
Create hunting rule
Author:Michelle Khalil
Description:This rule detects unpacked growtopia stealer malware samples.
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: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)
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Web download

QuasarRAT

Executable exe b77e9d9536abc8e48f5e4c3b3b1b3d212d841b98375bcd2fdc60ac2c10a387fe

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3562538/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/9812/

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