🤲🏼 NEW | abuse.ch Community Hub! Earn recognition 🏅 for the malware intelligence you share, climb the leaderboards 📈, and connect with like-minded contributors who share your hunting focus 🤝. Ready to unlock your profile? Go to the Community Hub →

MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877. 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: 8


Intelligence 8 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877
SHA3-384 hash: 3c86fdb6805a7a87e63a4d5899d6ef9c4a2a7579b473118c959330093159fc5e22f211d0a1d5864713ee9abfb851285d
SHA1 hash: 5462f3d0d5a36e2eb51a47219507c4a88329c46f
MD5 hash: 107d954162a71e93065aeabd4bd1771b
humanhash: oregon-summer-minnesota-green
File name:INVOICE.r15
Download: download sample
Signature GuLoader
Create hunting rule
File size:358'669 bytes
First seen:2025-09-29 10:23:40 UTC
Last seen:2025-09-29 10:23:56 UTC
File type: rar
MIME type:application/x-rar
ssdeep 6144:iPMX1+TohRnGvGlYF3SioNxQ9UD/tlMmb8CoAevJrQoisjYniHvWwL3SmXWwn5tq:GMFOoOvGlMCicsqimbmBR9isj8iHOAS7
TLSH T19574237F4E230289E3C9E18867C9E86FB245F418B1D2DF7FAF42B80B25289505B2D755
TrID 61.5% (.RAR) RAR compressed archive (v5.0) (8000/1)
38.4% (.RAR) RAR compressed archive (gen) (5000/1)
Magika rar
Reporter cocaman
Tags:GuLoader INVOICE payment r15 rar


Avatar
cocaman
Malicious email (T1566.001)
From: "info@gesolarcyprus.com" (likely spoofed)
Received: "from [91.92.242.11] (unknown [91.92.242.11]) "
Date: "29 Sep 2025 08:51:48 -0700"
Subject: "RE: Confirm revised invoice to proceed with payment ASAP"
Attachment: "INVOICE.r15"

Intelligence

File Origin
# of uploads :
2
# of downloads :
104
Origin country :
CH CH
File Archive Information

This file archive contains 9 file(s), sorted by their relevance:

File name:Selvgodheds.Ort
File size:29'195 bytes
SHA256 hash: 85172651c0161dc21a2b3a63a203c047601ed329910f81f005733ede6c8f61fc
MD5 hash: 95288661354371ba275fa39caf2dacd9
MIME type:application/octet-stream
Signature GuLoader
File name:indsbningernes.uku
File size:1'206 bytes
SHA256 hash: 8d8fb4646bf817f89b8b0b92ea22fbea7cde86f3adf0dc1c5b742c2c05a292be
MD5 hash: 4002eb52e2c3524d6fdb0d07bcb6ca12
MIME type:application/octet-stream
Signature GuLoader
File name:System.dll
File size:12'288 bytes
SHA256 hash: a44ca08afb3f6bafd76aa35c259f3d599fe34f6f49ea5118626c1c1a540b0f03
MD5 hash: 81e268e27dbbcadbf116b5a9402195ab
MIME type:application/x-dosexec
Signature GuLoader
File name:Varetagelser.Bry
File size:335'681 bytes
SHA256 hash: 11b6221a16128e751eff51a001583ecfab039519a225c800db5a5fc41e5e7a0c
MD5 hash: 6c335ffc3081186860ec6a1bfc2bfa0d
MIME type:application/octet-stream
Signature GuLoader
File name:modern-wizard.bmp
File size:26'494 bytes
SHA256 hash: 3ad2dc318056d0a2024af1804ea741146cfc18cc404649a44610cbf8b2056cf2
MD5 hash: cbe40fd2b1ec96daedc65da172d90022
MIME type:image/bmp
Signature GuLoader
File name:INVOICE.bat
File size:379'897 bytes
SHA256 hash: 8d0ac3fcbf0fcd6ee8ebb908f86ccb776b7bf5909b8afdace53145777956e11b
MD5 hash: b16cd34a161ba0048e6eda053fda7c51
MIME type:application/x-dosexec
Signature GuLoader
File name:nsDialogs.dll
File size:9'728 bytes
SHA256 hash: 7853be9190489ba84dae8232e9a967cec02d941732cb4137bc9ae6a392e89fb8
MD5 hash: 3fbd78c889fa40a2e5567b980c57b7db
MIME type:application/x-dosexec
Signature GuLoader
File name:jagerpiloters.une
File size:265 bytes
SHA256 hash: f48a4f8924a3401f361a026fb6cc29a0f49390636b8a93ad3e468edcf54268a5
MD5 hash: a8041bc00bb6c052fdff4904fae8dd8d
MIME type:application/octet-stream
Signature GuLoader
File name:BgImage.dll
File size:7'680 bytes
SHA256 hash: 68b17d8f988354adecd50d824568029ebd51d88293874ac2178cb49de2d763b7
MD5 hash: 4f2bc691e903d2cb134fb48a622df098
MIME type:application/x-dosexec
Signature GuLoader
Vendor Threat Intelligence
Verdict:
Clean
Score:
89.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68da5e5e40b7da0b4eb8b6bc
Tags:
n/a
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context anti-debug blackhole installer masquerade microsoft_visual_cc nsis overlay
Link:
https://www.filescan.io/uploads/68da5e5e74e5a2898997f093/reports/123e21ed-7821-4180-a637-28b77e11c43f/overview
Verdict:
Malicious
Labled as:
Trojan.Downloader
Link:
https://www.hybrid-analysis.com/sample/81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877
Verdict:
Malicious
File Type:
rar
First seen:
2025-09-28T20:52:00Z UTC
Last seen:
2025-09-28T20:52:00Z UTC
Hits:
~100
Detections:
Trojan-Downloader.Win32.Minix.sb Trojan.Win32.Guloader.sb Trojan.NSIS.Makoob.sbb Trojan.NSIS.Makoob.sba Packed.NSIS.Krynis.sb Trojan.Win32.GuLoader.ddh Trojan.NSIS.Pakes.Krynis.sb
Link:
https://opentip.kaspersky.com/81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877/results?tab=lookup
Verdict:
inconclusive
YARA:
1 match(es)
Tags:
Executable PE (Portable Executable) PE File Layout Rar Archive
Link:
https://app.malva.re/file/107d954162a71e93065aeabd4bd1771b
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877/
Verdict:
Malicious
Threat:
Family.GULOADER
Link:
https://tip.neiki.dev/file/81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2025-09-29 01:23:20 UTC
File Type:
Binary (Archive)
Extracted files:
9
AV detection:
21 of 38 (55.26%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=qfjwsahsnvqohnx7jjptqhbttxamrj5yhwuakdgptzyngrs5zb3q._file
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:guloader discovery downloader installer
Link:
https://tria.ge/reports/250929-qes6ysgk2s/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Loads dropped DLL
Guloader family
Guloader,Cloudeye
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877

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:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
Rule name:Ins_NSIS_Buer_Nov_2020_1
Create hunting rule
Author:Arkbird_SOLG
Description:Detect NSIS installer used for Buer loader
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.

Malspam

GuLoader

rar 81536900f26d60e3b6ff4a5f381c339dc0c8a7b83da8050ccf9e70d3465dc877

(this sample)

GuLoader

Executable exe 8d0ac3fcbf0fcd6ee8ebb908f86ccb776b7bf5909b8afdace53145777956e11b

  
Delivery method
Distributed via e-mail attachment
  
Dropping
SHA256 8d0ac3fcbf0fcd6ee8ebb908f86ccb776b7bf5909b8afdace53145777956e11b
  
Dropping
MD5 b16cd34a161ba0048e6eda053fda7c51

Comments