MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 c81f9bb496f15c924f81edd01d39153f055a2d2e5e3686c96d63ec48f5033a21. 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: 13
| SHA256 hash: | c81f9bb496f15c924f81edd01d39153f055a2d2e5e3686c96d63ec48f5033a21 |
|---|---|
| SHA3-384 hash: | b21000ba51453a821b4629dd75a77503668c4e5ae5e2f6d12a9d1a343df3de09b92cd65189539201c74fc647e5b185ca |
| SHA1 hash: | 51285bf6b8b816023b900abbb0a710479e53de71 |
| MD5 hash: | c6e901f5e5db594921cbd284c861ff80 |
| humanhash: | fruit-yellow-lithium-five |
| File name: | c81f9bb496f15c924f81edd01d39153f055a2d2e5e3686c96d63ec48f5033a21 |
| Download: | download sample |
| Signature | GuLoader |
| File size: | 920'176 bytes |
| First seen: | 2025-11-06 11:30:58 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 6e7f9a29f2c85394521a08b9f31f6275 (326 x GuLoader, 65 x AgentTesla, 63 x RemcosRAT) |
| ssdeep | 24576:YMwWJm6KVCdi9wPnAvc7qWe3ESBobebbr+gK:YMwZt9wPnMc7q70zbMbrE |
| TLSH | T1F115235312A6C1F2E2B78D756BAA137B8F54E9464B1C630F4381CD2BFCBB4A09B11761 |
| 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 | b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla) |
| Reporter |  adrian__luca |
| Tags: | exe GuLoader signed |
Code Signing Certificate
| Organisation: | Silkeborgvej |
|---|---|
| Issuer: | Silkeborgvej |
| Algorithm: | sha256WithRSAEncryption |
| Valid from: | 2025-09-18T05:27:42Z |
| Valid to: | 2026-09-18T05:27:42Z |
| Serial number: | 01b560d411dcb3cac6d7afc8ab73266bf6a05832 |
| Thumbprint Algorithm: | SHA256 |
| Thumbprint: | 04474bcf21aadf904471beb4ce1d9aa516d25c77d11d26cef907bd70c7a3df21 |
| Source: | This information was brought to you by ReversingLabs A1000 Malware Analysis Platform |
Intelligence
File Origin
# of uploads :
1
# of downloads :
148
Origin country :
HUVendor Threat Intelligence
Malware family:
remcos
ID:
1
File name:
c81f9bb496f15c924f81edd01d39153f055a2d2e5e3686c96d63ec48f5033a21
Verdict:
Malicious activity
Analysis date:
2025-11-06 21:43:41 UTC
Tags:
remcos rat remote stealer
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Verdict:
Malicious
Score:
99.1%
Tags:
injection obfusc virus
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a window
Creating a file in the %temp% subdirectories
Creating a file
Launching a process
Creating a process with a hidden window
Gathering data
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-10-27T21:40:00Z UTC
Last seen:
2025-11-07T05:23:00Z UTC
Hits:
~1000
Verdict:
Suspicious
Score:
100%
Verdict:
Malware
File Type:
PE
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 32 Exe x86
Threat name:
Win32.Trojan.GuLoader
Status:
Malicious
First seen:
2025-10-28 01:12:33 UTC
File Type:
PE (Exe)
Extracted files:
12
AV detection:
20 of 24 (83.33%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
remcos
Score:
10/10
Tags:
family:guloader family:remcos botnet:remotehost adware collection discovery downloader execution persistence ransomware rat spyware
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
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:
161.248.179.208:2404
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Unpacked files
SH256 hash:
c81f9bb496f15c924f81edd01d39153f055a2d2e5e3686c96d63ec48f5033a21
MD5 hash:
c6e901f5e5db594921cbd284c861ff80
SHA1 hash:
51285bf6b8b816023b900abbb0a710479e53de71
Malware family:
Remcos
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
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 |
|---|---|
| Author: | Obscurity Labs LLC |
| Description: | Detects NSIS installers by .ndata section + NSIS header string |
| Rule name: | PE_Digital_Certificate |
|---|---|
| Author: | albertzsigovits |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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