MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0. 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: 18


Intelligence 18 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0
SHA3-384 hash: e99ecfc3613084809fad97e20ade0d4ada99bfd1dbb135f5d44b3b7e1e807169ea7afcd9db4e55b6a670988ec0e7611f
SHA1 hash: 8b9e4cf00d735e1bf22ebb9a3f1d7b99b95be642
MD5 hash: 244d411a9a239a36b5e327d5d4008f54
humanhash: angel-east-delaware-autumn
File name:COI_BOSBOUTROS_BOSANGEL_20012026.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:1'001'312 bytes
First seen:2026-01-20 08:29:59 UTC
Last seen:2026-01-20 08:48:16 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f4639a0b3116c2cfc71144b88a929cfd (137 x GuLoader, 55 x Formbook, 40 x VIPKeylogger)
ssdeep 24576:+GEc6jSfY8sz3SqEafmF/Oyasbn9o1NDQCG2:51Q8sTSqEa+F/Oy1Y5j
Threatray 2'391 similar samples on MalwareBazaar
TLSH T16D2522C5A982E753CCA0C072CA5349F7194B6D2BE656393313D5BF2F38BB912A326513
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 e088a432b2d27098 (4 x RemcosRAT, 3 x GuLoader)
Reporter lowmal3
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Renovationsarbejderen
Issuer:Renovationsarbejderen
Algorithm:sha256WithRSAEncryption
Valid from:2025-11-28T02:16:07Z
Valid to:2026-11-28T02:16:07Z
Serial number: 287cb2fccbce706e4897bd8f0f617b86b59368d5
Thumbprint Algorithm:SHA256
Thumbprint: 01d42721fb256a60597b6a5aa6d20ae923f168113089dfd81c62889904c76a39
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
2
# of downloads :
135
Origin country :
DE DE
Vendor Threat Intelligence
Malware configuration found for:
NSIS
Details
Link:
https://research.acce.ciphertechsolutions.com/results/15b8b65c-e720-482b-996c-7b43317bf23a/
Malware family:
remcos
Create hunting rule
ID:
1
File name:
0eb36da69db05b770a9c45fe46034efe3b2f593008c61a24a78e3490cc4abbda.rar
Verdict:
Malicious activity
Analysis date:
2026-01-20 02:12:29 UTC
Tags:
arch-exec auto-reg remcos rat
Link:
https://app.any.run/tasks/8b502bb9-d2e5-4294-9c43-e8b20431362c

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/49485/
Verdict:
Malicious
Score:
94.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=696ee48cbcad3327ec06a5b4
Tags:
shellcode injection virus nsis
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
adaptive-context anti-debug blackhole dealply guloader installer installer installer-heuristic microsoft_visual_cc nsis signed soft-404 unsafe
Link:
https://www.filescan.io/uploads/696f3d32abc6d3ca6deb48a4/reports/433f92ab-83f8-4fc8-b69f-402157df3c38/overview
Verdict:
Malicious
Labled as:
TrojanDldr.OffLoader.gen
Link:
https://www.hybrid-analysis.com/sample/3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-01-19T20:41:00Z UTC
Last seen:
2026-01-22T03:54:00Z UTC
Hits:
~1000
Detections:
Trojan.NSIS.Makoob.sba Backdoor.Win32.Remcos.sb PDM:Trojan.Win32.Generic HEUR:Trojan-Downloader.Win32.Minix.gen Trojan-Downloader.Win32.Minix.sb Trojan.Win32.Guloader.sb
Link:
https://opentip.kaspersky.com/3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/db7f245c-6a96-4778-8e38-0814bff9ffb6
Result
Threat name:
Remcos, GuLoader
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1853798
Signature
AI detected suspicious PE digital signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Creates autostart registry keys with suspicious names
Detected Remcos RAT
Found hidden mapped module (file has been removed from disk)
Found malware configuration
Joe Sandbox ML detected suspicious sample
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Unusual module load detection (module proxying)
Writes to foreign memory regions
Yara detected GuLoader
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1853798 Sample: COI_BOSBOUTROS_BOSANGEL_200... Startdate: 20/01/2026 Architecture: WINDOWS Score: 100 68 drive.usercontent.google.com 2->68 70 drive.google.com 2->70 72 Suricata IDS alerts for network traffic 2->72 74 Found malware configuration 2->74 76 Antivirus detection for dropped file 2->76 78 9 other signatures 2->78 9 COI_BOSBOUTROS_BOSANGEL_20012026.exe 1 51 2->9         started        13 remcos.exe 24 2->13         started        15 remcos.exe 7 2->15         started        signatures3 process4 file5 56 C:\Users\user\AppData\Local\...\System.dll, PE32 9->56 dropped 88 Tries to detect virtualization through RDTSC time measurements 9->88 90 Unusual module load detection (module proxying) 9->90 92 Switches to a custom stack to bypass stack traces 9->92 17 COI_BOSBOUTROS_BOSANGEL_20012026.exe 2 10 9->17         started        22 COI_BOSBOUTROS_BOSANGEL_20012026.exe 9->22         started        58 C:\Users\user\AppData\Local\...\System.dll, PE32 13->58 dropped 24 remcos.exe 13->24         started        26 remcos.exe 13->26         started        signatures6 process7 dnsIp8 62 drive.google.com 142.250.72.142, 443, 49684, 49696 GOOGLEUS United States 17->62 64 drive.usercontent.google.com 142.251.34.65, 443, 49687, 49697 GOOGLEUS United States 17->64 46 C:\ProgramData\Remcos\remcos.exe, PE32 17->46 dropped 48 C:\ProgramData\...\remcos.exe:Zone.Identifier, ASCII 17->48 dropped 80 Creates autostart registry keys with suspicious names 17->80 28 remcos.exe 24 17->28         started        32 COI_BOSBOUTROS_BOSANGEL_20012026.exe 17->32         started        66 192.210.186.231, 2404, 49698, 49699 AS-COLOCROSSINGUS United States 24->66 50 C:\Users\user\AppData\Local\Temp\TH80BB.tmp, MS-DOS 24->50 dropped 52 C:\Users\user\AppData\Local\Temp\TH808B.tmp, MS-DOS 24->52 dropped 54 C:\Users\user\AppData\Local\Temp\TH807A.tmp, MS-DOS 24->54 dropped 82 Detected Remcos RAT 24->82 84 Writes to foreign memory regions 24->84 86 Maps a DLL or memory area into another process 24->86 34 RmClient.exe 24->34         started        36 RmClient.exe 24->36         started        38 RmClient.exe 24->38         started        40 remcos.exe 24->40         started        file9 signatures10 process11 file12 60 C:\Users\user\AppData\Local\...\System.dll, PE32 28->60 dropped 94 Antivirus detection for dropped file 28->94 96 Multi AV Scanner detection for dropped file 28->96 98 Found hidden mapped module (file has been removed from disk) 28->98 108 2 other signatures 28->108 42 remcos.exe 7 28->42         started        44 remcos.exe 28->44         started        100 Tries to harvest and steal browser information (history, passwords, etc) 34->100 102 Unusual module load detection (module proxying) 34->102 104 Tries to steal Instant Messenger accounts or passwords 36->104 106 Tries to steal Mail credentials (via file / registry access) 36->106 signatures13 process14
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0
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/244d411a9a239a36b5e327d5d4008f54
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2026-01-20 00:14:52 UTC
File Type:
PE (Exe)
Extracted files:
24
AV detection:
17 of 37 (45.95%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=h32card5l6galhfzjgnqdk2kf643bti6m5zcrvvlb36ucy6yltya._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
cloudeye
Create hunting rule
Similar samples:
0645a7ba3f25c2f398a13f9d0d6701e9d3602044f3045f1ca1d598e08e4cde82
GuLoader
19b8eabc143b4307a4496fec6012965f918e18d0e33a989292568f37a4c5f1ba
GuLoader
5c165586ed7a8f62f8d8fe850d874ede748092d4dbf54667ce8b02b4081c4cfe
GuLoader
bdd5b953bef085550bb5891e8d3c7248b5b16fcbba1bb26e2be18c4801d1a98e
GuLoader
d539aa17bfa95bc25c81308a99a1c834cb28ad23f1ce8bc3715066471bd5d0f7
GuLoader
error
GuLoader
+ 2'381 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:guloader family:remcos botnet:remotehost collection discovery downloader persistence rat
Link:
https://tria.ge/reports/260120-keh34adz4h/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Adds Run key to start application
Contacts third-party web service commonly abused for C2
Executes dropped EXE
Loads dropped DLL
Detected Nirsoft tools
NirSoft MailPassView
Guloader family
Guloader,Cloudeye
Remcos
Remcos family
Malware Config
C2 Extraction:
192.210.186.231:2404
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/80604de7-3ce4-4de9-ba89-4580d4a59110
Unpacked files
SH256 hash:
3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0
MD5 hash:
244d411a9a239a36b5e327d5d4008f54
SHA1 hash:
8b9e4cf00d735e1bf22ebb9a3f1d7b99b95be642
Link:
https://www.unpac.me/results/42a18c0f-43aa-46ba-a28b-3667e810bf64/
SH256 hash:
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706
MD5 hash:
4add245d4ba34b04f213409bfe504c07
SHA1 hash:
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09
Link:
https://www.unpac.me/results/42a18c0f-43aa-46ba-a28b-3667e810bf64/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/3ef420447d5f/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/3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0

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

File information

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

Malspam

GuLoader

Executable exe 3ef420447d5f8c059cb9499b01ab4a2fb9b0cd1e677228d6ab0efd4163d85cf0

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/49485/

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