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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397. 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: 15


Intelligence 15 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397
SHA3-384 hash: 81b063676dd400a80fa25cb7c414f406cde8268200e1cabcd8397c8b692a4281a08a7da5e6dd1ebb88f12f371f24aa81
SHA1 hash: c3b8db1276e1f0504b56665716185b7aa2ffc891
MD5 hash: 4af2ee9160ccc18ab359c88acd656e72
humanhash: twenty-jersey-nine-north
File name:Overviolent.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:715'160 bytes
First seen:2025-10-09 13:06:44 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 744 x AgentTesla, 441 x GuLoader)
ssdeep 12288:2YMyYdO7dejClw8Nz56tVOk8Mb+UwDGwjZHbisGL/wAnGuv:2YMRClwqz56tVO8mtbisGL/ZG
Threatray 4'318 similar samples on MalwareBazaar
TLSH T110E4BF2476F1507BD1E7077ADE63EB18B6749F92BA26120F2310BF88BE75341690F528
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10522/11/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
dhash icon 81e0f8f2f672b230 (1 x ArkeiStealer, 1 x GuLoader)
Reporter Anonymous
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Transfission
Issuer:Transfission
Algorithm:sha256WithRSAEncryption
Valid from:2025-08-15T00:28:09Z
Valid to:2026-08-15T00:28:09Z
Serial number: 0e23215e4c6e5b7abbdace9c42072403362f33af
Thumbprint Algorithm:SHA256
Thumbprint: 36deafdf997a1f9cc5418fc8936e46a653258d7b5527f0d36e704c3b2990896b
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
103
Origin country :
US US
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Overviolent.exe
Verdict:
Malicious activity
Analysis date:
2025-10-09 13:09:22 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/050c1a19-ca23-4ac1-add9-e3e1b96baff3

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/31303/
Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68e7b3927f305fa2545df357
Tags:
shellcode virus blic
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a file in the %AppData% subdirectories
Creating a file
Sending a custom TCP request
Unauthorized injection to a recently created process
Restart of the analyzed sample
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context anti-debug blackhole installer microsoft_visual_cc nsis overlay signed
Link:
https://www.filescan.io/uploads/68e7b3925a3bccf09ebf25cb/reports/8489c4ec-3431-43b2-b2db-6bdc69ecd17e/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-10-09T05:29:00Z UTC
Last seen:
2025-10-11T05:38:00Z UTC
Hits:
~1000
Detections:
Trojan-Dropper.Win32.Injector.sb Trojan-Downloader.Win32.Minix.sb Trojan.Win32.Yakes Trojan.Win32.Guloader.sb Trojan.NSIS.Makoob.sba Packed.NSIS.Krynis.sb PDM:Trojan.Win32.Generic HEUR:Trojan.Win32.GuLoader.gen
Link:
https://opentip.kaspersky.com/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397/results?tab=lookup
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/bbbec3b9-88ce-4447-945e-014598a83dac
Score:
94%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 32 Exe x86
Link:
https://app.malva.re/file/4af2ee9160ccc18ab359c88acd656e72
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2025-10-09 13:07:28 UTC
File Type:
PE (Exe)
Extracted files:
11
AV detection:
11 of 24 (45.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=sbgle26gaeod24mz6edfftxtdg4douxapdllfotkpbkq6t55wolq._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Similar samples:
0c67ccd6b722d25bbe932693afe8d0895555d12442699122c8810d2d6610e2a8
GuLoader
0cb6636748ff6a60ebf1a4644a7b4c877f8a19edd8c7a2eac10b34d1bd7cbfbf
GuLoader
29032ae14e315863a55a0851c3e1c9cb246beb4513a279d8b1bf7fac97be6ff7
GuLoader
2bab4b4ef0cd5ce5f2dff0ddcbdfb7295c0d141fb4c88ec305268b24a3e23a5c
GuLoader
43753d7fe1487c758cfebd575c0818b13ef5c3c278a0fa9539e04fe1a86553eb
GuLoader
55118f31295208ddb2a3e7f18a340056c791d338d8375080cdf618c2bc01bd08
GuLoader
79866667d5cd578a1c6eda54a748ff9d316fff39064eecd282bc2a9ad8a5ac7d
GuLoader
da9c5f609ebbcf19aef3d6992d451ccbe4fa77858660f6861146d1a486e1d98e
GuLoader
ebb0272ecef9d8bf07a71b9ead8718760d27c4fdc334fe2de7a8b93237e61044
GuLoader
error
GuLoader
+ 4'308 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:guloader family:remcos collection discovery downloader persistence rat
Link:
https://tria.ge/reports/251009-qcvxrsyl12/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Launches sc.exe
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Adds Run key to start application
Looks up external IP address via web service
Loads dropped DLL
Detected Nirsoft tools
NirSoft MailPassView
NirSoft WebBrowserPassView
Guloader family
Guloader,Cloudeye
Remcos
Remcos family
Verdict:
Unknown
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/41fa9932-7c01-426e-b8a8-36e3e7ea5d5b
Unpacked files
SH256 hash:
904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397
MD5 hash:
4af2ee9160ccc18ab359c88acd656e72
SHA1 hash:
c3b8db1276e1f0504b56665716185b7aa2ffc891
Link:
https://www.unpac.me/results/29ee0673-49e7-4a8d-b8b8-366a7ca45a95/
SH256 hash:
56b96add1978b1abba286f7f8982b0efbe007d4a48b3ded6a4d408e01d753fe2
MD5 hash:
6c3f8c94d0727894d706940a8a980543
SHA1 hash:
0d1bcad901be377f38d579aafc0c41c0ef8dcefd
Link:
https://www.unpac.me/results/29ee0673-49e7-4a8d-b8b8-366a7ca45a95/
SH256 hash:
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8
MD5 hash:
cff85c549d536f651d4fb8387f1976f2
SHA1 hash:
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e
Link:
https://www.unpac.me/results/29ee0673-49e7-4a8d-b8b8-366a7ca45a95/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/904cb26bc601/report/overview.html
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/904cb26bc6011c3d7199f10652cef319b83752e078d6b2ba6a78550f4fbdb397

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:Detect_NSIS_Nullsoft_Installer
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects NSIS installers by .ndata section + NSIS header string
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns

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/31303/

Comments