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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e. 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


GuLoader


Vendor detections: 11


Intelligence 11 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e
SHA3-384 hash: 4cd139b5ae78e7b3c26dcee64e3c1dd69b06fad8f35431ce7f5f52b8d3144bd5668027c9a27ff79cff57954137a7d80e
SHA1 hash: 29bd1a02c628a407c0c4440583f784e01df476df
MD5 hash: b2325402115a614f754dff02aaf3bd5c
humanhash: kansas-whiskey-july-golf
File name:RFQ_83760_56984.vbs
Download: download sample
Signature GuLoader
Create hunting rule
File size:276'572 bytes
First seen:2026-08-01 14:03:58 UTC
Last seen:Never
File type:Visual Basic Script (vbs) vbs
MIME type:text/plain
ssdeep 6144:eljSVVaUbAJW9CC6lvpVY0yWzZSn9/1GFZAArCZ:eieKC5pfktAZe
TLSH T1F3441720D9E40B3A0E5307EDBE515A55C4FDC6294622D0FCEADE071E60139ACDBBF269
Magika vba
Reporter threatcat_ch
Tags:GuLoader vbs

Intelligence

File Origin
# of uploads :
1
# of downloads :
106
Origin country :
CH CH
Vendor Threat Intelligence
No detections
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/77125/
Detection(s):
Sanesecurity.Malware.32585.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.32637.UNOFFICIAL
Create hunting rule

Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
evasive lolbin msiexec
Link:
https://www.filescan.io/uploads/6a6dfceb7f911f558d9a9ff6/reports/596408c9-d420-4176-9167-a64513102bdc/overview
Verdict:
Malicious
Labled as:
VBS/Agent.CYT
Link:
https://www.hybrid-analysis.com/sample/3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e
Verdict:
Malicious
File Type:
vbs
First seen:
2026-08-01T10:31:00Z UTC
Last seen:
2026-08-03T12:39:00Z UTC
Hits:
~10000
Link:
https://opentip.kaspersky.com/3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e/results?tab=lookup
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1950953
Signature
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Potential malicious VBS script found (suspicious strings)
Sigma detected: Potential PowerShell Command Line Obfuscation
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
VBScript performs obfuscated calls to suspicious functions
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
WScript reads language and country specific registry keys (likely country aware script)
Wscript starts Powershell (via cmd or directly)
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1950953 Sample: RFQ_83760_56984.vbs Startdate: 01/08/2026 Architecture: WINDOWS Score: 100 27 drive.usercontent.google.com 2->27 29 drive.google.com 2->29 37 Malicious sample detected (through community Yara rule) 2->37 39 Multi AV Scanner detection for submitted file 2->39 41 Yara detected GuLoader 2->41 43 5 other signatures 2->43 8 wscript.exe 1 2->8         started        11 powershell.exe 15 2->11         started        13 rundll32.exe 2->13         started        signatures3 process4 signatures5 45 VBScript performs obfuscated calls to suspicious functions 8->45 47 Suspicious powershell command line found 8->47 49 Wscript starts Powershell (via cmd or directly) 8->49 57 3 other signatures 8->57 15 powershell.exe 17 8->15         started        51 Writes to foreign memory regions 11->51 53 Found suspicious powershell code related to unpacking or dynamic code loading 11->53 55 Switches to a custom stack to bypass stack traces 11->55 19 wab.exe 3 1 11->19         started        21 conhost.exe 11->21         started        23 wab.exe 11->23         started        process6 dnsIp7 31 drive.usercontent.google.com 192.178.50.65, 443, 49766 GOOGLE-GoogleLLCUS United States 15->31 33 drive.google.com 192.178.50.78, 443, 49764 GOOGLE-GoogleLLCUS United States 15->33 35 Found suspicious powershell code related to unpacking or dynamic code loading 15->35 25 conhost.exe 15->25         started        signatures8 process9
Score:
83%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e
Verdict:
Malware
YARA:
1 match(es)
Tags:
Scripting.FileSystemObject Shell.Application T1059.005 VBS Execute Sub-Script VBScript WScript.Shell
Link:
https://app.malva.re/file/b2325402115a614f754dff02aaf3bd5c
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e/
Threat name:
Script-WScript.Trojan.Heuristic
Create hunting rule
Status:
Malicious
First seen:
2026-08-01 14:04:52 UTC
File Type:
Text (VBS)
AV detection:
10 of 24 (41.67%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=h7x4ddauzch2d2wpcdmwfd4rmnacmyqchhuuj75ugoz6mvrgtfxa._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost collection discovery execution rat
Link:
https://tria.ge/reports/260801-rdgl7s1te1/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
outlook_office_path
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Executes a VBScript file via the Windows Script Host.
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Accesses Microsoft Outlook profiles
Command and Scripting Interpreter: PowerShell
Contacts third-party web service commonly abused for C2
Checks computer location settings
Executes dropped EXE
Badlisted process makes network request
Family: Remcos
Malware Config
C2 Extraction:
160.25.72.34:2404
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e

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:dependsonpythonailib
Create hunting rule
Author:Tim Brown
Description:Hunts for dependencies on Python AI libraries
Rule name:detect_tiny_vbs
Create hunting rule
Author:daniyyell
Description:Detects tiny VBS delivery technique
Rule name:Guloader_VBScript
Create hunting rule
Author:Ankit Anubhav - ankitanubhav.info
Description:Detects GuLoader/CloudEye VBScripts
Rule name:telebot_framework
Create hunting rule
Author:vietdx.mb

File information

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

Malspam

GuLoader

Visual Basic Script (vbs) vbs 3fefc18c14c88fa1eacf10d9628f91634026620239e944ffb433b3e65626996e

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/77125/

Comments