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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71. 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: 14


Intelligence 14 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71
SHA3-384 hash: b26cdaa87cc9d14af2b451ed672be00c32609ec5ca2cc1fd705fef2025d2e83238d675da671bbe8a439ecd75f219d7ae
SHA1 hash: fdaa2cc37cb37f24abbf6da7af6cdf27b6d9f9b7
MD5 hash: 7a3950eacbbeff31ae00f4d80d56a97d
humanhash: pizza-kilo-johnny-connecticut
File name:Achtehalber.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:929'592 bytes
First seen:2026-05-20 18:09:07 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash e2a592076b17ef8bfb48b7e03965a3fc (419 x GuLoader, 63 x RemcosRAT, 52 x AgentTesla)
ssdeep 24576:UjvTizhGAfP8sV21yXvRkIPYvzQasJ6lIyh0IX:U7EUAcsVXSxvcasQlIyhV
Threatray 2'409 similar samples on MalwareBazaar
TLSH T1521523427790C86DE272093AC9387EFEBBA06DE9D5916E2713443D4DFC3A2D16D0D682
TrID 50.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
10.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
10.5% (.EXE) Win64 Executable (generic) (6522/11/2)
8.1% (.EXE) Win16 NE executable (generic) (5038/12/1)
7.2% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
Reporter TomU
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:kummerfuld
Issuer:kummerfuld
Algorithm:sha256WithRSAEncryption
Valid from:2024-06-28T00:02:30Z
Valid to:2025-06-28T00:02:30Z
Serial number: 5c4260935a4869676d1b62d66edb9596819e2018
Thumbprint Algorithm:SHA256
Thumbprint: 957b0f00889df12b92e4c27f389376a57cf2a67fbea7fc42aa587919478acf4d
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
95
Origin country :
CH CH
Vendor Threat Intelligence
Malware configuration found for:
GuLoader NSIS
Details
GuLoader
an XOR decryption key and an extracted component
GuLoader
a c2 URL, a useragent string, and a string XOR key
NSIS
extracted archive contents
Link:
https://research.acce.ciphertechsolutions.com/results/d5c95837-4694-4208-8206-e292ccd46648/
Malware family:
n/a
ID:
1
File name:
exe
Verdict:
Malicious activity
Analysis date:
2026-05-20 23:32:40 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/454b14bb-a391-499b-90bd-e5aab501b6d3

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/66950/
Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a0dfe1d4159ce11f601dc2a
Tags:
injection obfusc virus
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Searching for the window
Creating a file
Creating a file in the %temp% subdirectories
Delayed reading of the file
Sending a custom TCP request
Unauthorized injection to a recently created process
Restart of the analyzed sample
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug expired-cert installer installer installer-heuristic microsoft_visual_cc nsis packed reconnaissance signed
Link:
https://www.filescan.io/uploads/6a0e0009861ee596e641c24f/reports/3070d357-3427-4fdf-a165-24c115aa8494/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-06-11T12:13:00Z UTC
Last seen:
2026-03-18T11:04:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/885e2980-ab98-4761-baa3-99b70109d2bd
Score:
83%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71/
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2025-06-11 19:54:05 UTC
File Type:
PE (Exe)
Extracted files:
13
AV detection:
25 of 37 (67.57%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=w6zyge4z3gt4gpgaqatyh4uqzm7cx3s3lkmqecuv3i4w4ik2hzyq._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Similar samples:
329d8980bb4ef76aa39696076ea0f0c4997d91c51d702a4eec546c956fa46715
GuLoader
402bcd858e3bd3174fd8f5dd10538c5566dd83f083f81727d0d0162ead86d133
GuLoader
4b29564a5235875f5ec10225192b96ef4974287f1fcb5c69bacd516ff15cb315
GuLoader
57c9885a240b2f35d6abf310fd8e3f0bb829013063622e6cd04bdb4adceb915e
GuLoader
6c779eed5cf92c1aa85a5bf9fbba342b24e37fe65769183ab5211caeeb0c8289
GuLoader
afe3acd3fa1eabe109da9d80b9d38cee777a7a74046fde36b9fe4343051882ba
GuLoader
cdbdc4261d286272c9a97c8fd2048866e924b19abf0b4e2bdf68f9594b65fa2a
GuLoader
ced82528b08a52a9a0aaaffdeda31641897e0973685562506f88674a3da1cf98
GuLoader
error
GuLoader
f62e409896890b3a047f1fefefa195f870c156719b7d8e371e48459cb461941c
GuLoader
+ 2'399 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  7/10
Tags:
discovery
Link:
https://tria.ge/reports/260520-wrqt9afv2k/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Suspicious use of NtSetInformationThreadHideFromDebugger
Contacts third-party web service commonly abused for C2
Loads dropped DLL
Unpacked files
SH256 hash:
b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71
MD5 hash:
7a3950eacbbeff31ae00f4d80d56a97d
SHA1 hash:
fdaa2cc37cb37f24abbf6da7af6cdf27b6d9f9b7
Link:
https://www.unpac.me/results/a46c3a26-c211-4d73-8233-58f941a37114/
SH256 hash:
2e226715419a5882e2e14278940ee8ef0aa648a3ef7af5b3dc252674111962bc
MD5 hash:
a4dd044bcd94e9b3370ccf095b31f896
SHA1 hash:
17c78201323ab2095bc53184aa8267c9187d5173
Link:
https://www.unpac.me/results/a46c3a26-c211-4d73-8233-58f941a37114/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b7b3831399d9/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/b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71

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_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:https://cyfare.net/
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.

File information

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

Malspam

GuLoader

Executable exe b7b3831399d9a7c33cc0802783f290cb3e2bee5b5a99020a95da396e215a3e71

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/66950/

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