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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6. 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: 16


Intelligence 16 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6
SHA3-384 hash: 6c21405d883a3fcbe3ba9f271dd995cc0419c99cb07238140cb1ad04cd72ed7ecd17d24e0e3ed48049c97c86ca84b2b9
SHA1 hash: a87751cdc1b27a2230d80806da5b66b25e0554e3
MD5 hash: a6d9ea358dc7f7b4b31bb30f44280950
humanhash: december-west-hamper-robert
File name:GS-25100014-DOCX.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:427'339 bytes
First seen:2025-10-31 05:24:14 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 4f67aeda01a0484282e8c59006b0b352 (52 x GuLoader, 10 x VIPKeylogger, 9 x RemcosRAT)
ssdeep 12288:go3aCt3Bcjdg/Im9IjyLfeh2M3ZZ/uSWNsl:go3aCt3BYdg/H9sUfehJZbWNK
TLSH T11B94122172D7C41BDB132B701AB652BB53B57FA14212A3036B70AFAFBC391905E716E1
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 c4dadadad2f492c2 (148 x GuLoader, 51 x RemcosRAT, 23 x VIPKeylogger)
Reporter threatcat_ch
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
1
# of downloads :
201
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
GS-25100014-DOCX.exe
Verdict:
Malicious activity
Analysis date:
2025-10-31 05:25:26 UTC
Tags:
remcos rat remote stealer guloader
Link:
https://app.any.run/tasks/a0fb174b-fb64-4811-958b-3f5706a19743

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/34871/
Detection(s):
SecuriteInfo.com.Adware.Generic12.HOD.14374.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=690448169942f1282ecac7b9
Tags:
injector uloader virus
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Searching for the window
Creating a file
Sending a custom TCP request
Launching a process
Creating a process with a hidden window
Using the Windows Management Instrumentation requests
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug blackhole guloader installer installer installer-heuristic microsoft_visual_cc nemesis nsis overlay powershell unsafe
Link:
https://www.filescan.io/uploads/69044812de25fddba05e3510/reports/7f004627-cc66-4b92-abda-21ecc0b104a0/overview
Verdict:
Malicious
Labled as:
TrojanSpy.Agent.gen
Link:
https://www.hybrid-analysis.com/sample/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-10-30T23:00:00Z UTC
Last seen:
2025-11-02T03:38:00Z UTC
Hits:
~1000
Detections:
HEUR:Trojan.Win32.Makoob.gen Trojan.NSIS.Makoob.sbc Trojan.NSIS.Makoob.sbb Trojan.NSIS.Makoob.sba
Link:
https://opentip.kaspersky.com/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6/results?tab=lookup
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/624bd4c6-402a-4856-a920-9861994493c2
Result
Threat name:
Remcos, GuLoader
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1805542
Signature
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Detected Remcos RAT
Early bird code injection technique detected
Found hidden mapped module (file has been removed from disk)
Found malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Powershell drops PE file
Queues an APC in another process (thread injection)
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
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)
Tries to steal Mail credentials (via file registry)
Writes to foreign memory regions
Yara detected GuLoader
Yara detected Remcos RAT
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1805542 Sample: GS-25100014-DOCX.exe Startdate: 31/10/2025 Architecture: WINDOWS Score: 100 41 drive.usercontent.google.com 2->41 43 drive.google.com 2->43 59 Suricata IDS alerts for network traffic 2->59 61 Found malware configuration 2->61 63 Antivirus detection for dropped file 2->63 65 8 other signatures 2->65 9 GS-25100014-DOCX.exe 4 73 2->9         started        signatures3 process4 process5 11 powershell.exe 30 9->11         started        file6 37 C:\Users\user\...behaviorgraphS-25100014-DOCX.exe, PE32 11->37 dropped 39 C:\...behaviorgraphS-25100014-DOCX.exe:Zone.Identifier, ASCII 11->39 dropped 75 Early bird code injection technique detected 11->75 77 Writes to foreign memory regions 11->77 79 Found suspicious powershell code related to unpacking or dynamic code loading 11->79 81 4 other signatures 11->81 15 msiexec.exe 4 10 11->15         started        20 conhost.exe 11->20         started        signatures7 process8 dnsIp9 45 161.248.179.190, 2404, 49723, 49724 BPL-ASNUS unknown 15->45 47 drive.google.com 142.251.33.78, 443, 49721 GOOGLEUS United States 15->47 49 drive.usercontent.google.com 142.251.34.193, 443, 49722 GOOGLEUS United States 15->49 31 C:\Users\user\AppData\Local\Temp\TH4AE7.tmp, MS-DOS 15->31 dropped 33 C:\Users\user\AppData\Local\Temp\TH4AC7.tmp, MS-DOS 15->33 dropped 35 C:\Users\user\AppData\Local\Temp\TH4AA7.tmp, PE32 15->35 dropped 51 Detected Remcos RAT 15->51 53 Writes to foreign memory regions 15->53 55 Found hidden mapped module (file has been removed from disk) 15->55 57 2 other signatures 15->57 22 RmClient.exe 14 15->22         started        25 RmClient.exe 1 15->25         started        27 RmClient.exe 15->27         started        29 conhost.exe 15->29         started        file10 signatures11 process12 signatures13 67 Tries to steal Mail credentials (via file registry) 22->67 69 Tries to harvest and steal browser information (history, passwords, etc) 22->69 71 Tries to steal Instant Messenger accounts or passwords 25->71 73 Tries to steal Mail credentials (via file / registry access) 25->73
Score:
97%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6
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/a6d9ea358dc7f7b4b31bb30f44280950
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2025-10-31 03:16:13 UTC
File Type:
PE (Exe)
Extracted files:
20
AV detection:
17 of 23 (73.91%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=zakz3m5xchui3b3ff7q5jkfgaq3cfnr27ewboaqgolr5hf2x3dta._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:guloader family:remcos botnet:remotehost adware collection discovery downloader execution installer persistence ransomware rat spyware
Link:
https://tria.ge/reports/251031-f31wlafw2h/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: PowerShell
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Badlisted process makes network request
Legitimate hosting services abused for malware hosting/C2
Checks computer location settings
Detected Nirsoft tools
NirSoft MailPassView
NirSoft WebBrowserPassView
Guloader family
Guloader,Cloudeye
Remcos
Remcos family
Malware Config
C2 Extraction:
161.248.179.190:2404
Unpacked files
SH256 hash:
c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6
MD5 hash:
a6d9ea358dc7f7b4b31bb30f44280950
SHA1 hash:
a87751cdc1b27a2230d80806da5b66b25e0554e3
Link:
https://www.unpac.me/results/9e4fd994-7997-4dd9-80b2-369344460617/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c8159db3b711/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/c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6

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_SliverFox_String
Create hunting rule
Author:huoji
Description:Detect files is `SliverFox` malware
Rule name:FreddyBearDropper
Create hunting rule
Author:Dwarozh Hoshiar
Description:Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.
Rule name:Ins_NSIS_Buer_Nov_2020_1
Create hunting rule
Author:Arkbird_SOLG
Description:Detect NSIS installer used for Buer loader

File information

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

Malspam

GuLoader

Executable exe c8159db3b711e88d87652fe1d4a8a6043622b63af92c17020672e3d39757d8e6

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/34871/

Comments